Supporting EdDSA

closes #15714

Signed-off-by: Takashi Norimatsu <takashi.norimatsu.ws@hitachi.com>

Co-authored-by: Muhammad Zakwan Bin Mohd Zahid <muhammadzakwan.mohdzahid.fg@hitachi.com>
Co-authored-by: rmartinc <rmartinc@redhat.com>

adapters/oidc/spring-boot2/.gitignore

@@ -0,0 +1,2 @@
+/.apt_generated/
+/.apt_generated_tests/

adapters/saml/wildfly/wildfly-jakarta-subsystem/.gitignore

@@ -0,0 +1,2 @@
+/.apt_generated/
+/.apt_generated_tests/

adapters/saml/wildfly/wildfly-subsystem/.gitignore

@@ -0,0 +1,2 @@
+/.apt_generated/
+/.apt_generated_tests/

core/pom.xml

@@ -69,6 +69,48 @@
             <scope>test</scope>
         </dependency>
     </dependencies>
+
+    <profiles>
+        <profile>
+            <id>jdk-16</id>
+            <activation>
+                <jdk>[16,)</jdk>
+            </activation>
+            <build>
+                <plugins>
+                    <plugin>
+                        <artifactId>maven-compiler-plugin</artifactId>
+                        <executions>
+                            <execution>
+                                <id>compile-java16</id>
+                                <phase>compile</phase>
+                                <goals>
+                                    <goal>compile</goal>
+                                </goals>
+                                <configuration>
+                                    <release>16</release>
+                                    <compileSourceRoots>
+                                        <compileSourceRoot>${project.basedir}/src/main/java16</compileSourceRoot>
+                                    </compileSourceRoots>
+                                    <multiReleaseOutput>true</multiReleaseOutput>
+                                </configuration>
+                            </execution>
+                        </executions>
+                    </plugin>
+                    <plugin>
+                        <groupId>org.apache.felix</groupId>
+                        <artifactId>maven-bundle-plugin</artifactId>
+                        <configuration>
+                            <instructions>
+                                <_fixupmessages>"Classes found in the wrong directory";is:=warning</_fixupmessages>
+                            </instructions>
+                        </configuration>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
+
     <build>
         <resources>
             <resource>
@@ -83,6 +125,9 @@
                 <configuration>
                     <archive>
                         <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
+                        <manifestEntries>
+                            <Multi-Release>true</Multi-Release>
+                        </manifestEntries>
                     </archive>
                 </configuration>
                 <executions>

core/src/main/java/org/keycloak/crypto/Algorithm.java

@@ -27,13 +27,21 @@ public interface Algorithm {
     String RS256 = "RS256";
     String RS384 = "RS384";
     String RS512 = "RS512";
-    String ES256 = "ES256";
-    String ES384 = "ES384";
-    String ES512 = "ES512";
     String PS256 = "PS256";
     String PS384 = "PS384";
     String PS512 = "PS512";
 
+    /* ECDSA signing algorithms  */
+    String ES256 = "ES256";
+    String ES384 = "ES384";
+    String ES512 = "ES512";
+
+    /* EdDSA signing algorithms  */
+    String EdDSA = "EdDSA";
+    /* EdDSA Curve */
+    String Ed25519 = "Ed25519";
+    String Ed448 = "Ed448";
+
     /* RSA Encryption Algorithms */
     String RSA1_5 = CryptoConstants.RSA1_5;
     String RSA_OAEP = CryptoConstants.RSA_OAEP;

core/src/main/java/org/keycloak/crypto/AsymmetricSignatureSignerContext.java

@@ -39,13 +39,13 @@ public class AsymmetricSignatureSignerContext implements SignatureSignerContext
 
     @Override
     public String getHashAlgorithm() {
-        return JavaAlgorithm.getJavaAlgorithmForHash(key.getAlgorithmOrDefault());
+        return JavaAlgorithm.getJavaAlgorithmForHash(key.getAlgorithmOrDefault(), key.getCurve());
     }
 
     @Override
     public byte[] sign(byte[] data) throws SignatureException {
         try {
-            Signature signature = Signature.getInstance(JavaAlgorithm.getJavaAlgorithm(key.getAlgorithmOrDefault()));
+            Signature signature = Signature.getInstance(JavaAlgorithm.getJavaAlgorithm(key.getAlgorithmOrDefault(), key.getCurve()));
             signature.initSign((PrivateKey) key.getPrivateKey());
             signature.update(data);
             return signature.sign();

core/src/main/java/org/keycloak/crypto/AsymmetricSignatureVerifierContext.java

@@ -42,7 +42,7 @@ public class AsymmetricSignatureVerifierContext implements SignatureVerifierCont
     @Override
     public boolean verify(byte[] data, byte[] signature) throws VerificationException {
         try {
-            Signature verifier = Signature.getInstance(JavaAlgorithm.getJavaAlgorithm(key.getAlgorithmOrDefault()));
+            Signature verifier = Signature.getInstance(JavaAlgorithm.getJavaAlgorithm(key.getAlgorithmOrDefault(), key.getCurve()));
             verifier.initVerify((PublicKey) key.getPublicKey());
             verifier.update(data);
             return verifier.verify(signature);

core/src/main/java/org/keycloak/crypto/JavaAlgorithm.java

@@ -30,13 +30,20 @@ public class JavaAlgorithm {
     public static final String PS256 = "SHA256withRSAandMGF1";
     public static final String PS384 = "SHA384withRSAandMGF1";
     public static final String PS512 = "SHA512withRSAandMGF1";
+    public static final String Ed25519 = "Ed25519";
+    public static final String Ed448 = "Ed448";
     public static final String AES = "AES";
 
     public static final String SHA256 = "SHA-256";
     public static final String SHA384 = "SHA-384";
     public static final String SHA512 = "SHA-512";
+    public static final String SHAKE256 = "SHAKE-256";
 
     public static String getJavaAlgorithm(String algorithm) {
+        return getJavaAlgorithm(algorithm, null);
+    }
+
+    public static String getJavaAlgorithm(String algorithm, String curve) {
         switch (algorithm) {
             case Algorithm.RS256:
                 return RS256;
@@ -62,6 +69,11 @@ public class JavaAlgorithm {
                 return PS384;
             case Algorithm.PS512:
                 return PS512;
+            case Algorithm.EdDSA:
+                if (curve != null) {
+                    return curve;
+                }
+                return Ed25519;
             case Algorithm.AES:
                 return AES;
             default:
@@ -69,8 +81,11 @@ public class JavaAlgorithm {
         }
     }
 
-
     public static String getJavaAlgorithmForHash(String algorithm) {
+        return getJavaAlgorithmForHash(algorithm, null);
+    }
+
+    public static String getJavaAlgorithmForHash(String algorithm, String curve) {
         switch (algorithm) {
             case Algorithm.RS256:
                 return SHA256;
@@ -96,6 +111,18 @@ public class JavaAlgorithm {
                 return SHA384;
             case Algorithm.PS512:
                 return SHA512;
+            case Algorithm.EdDSA:
+                if (curve != null) {
+                    switch (curve) {
+                        case Algorithm.Ed25519:
+                            return SHA512;
+                        case Algorithm.Ed448:
+                            return SHAKE256;
+                        default:
+                            throw new IllegalArgumentException("Unknown curve for EdDSA " + curve);
+                    }
+                }
+                return SHA512;
             case Algorithm.AES:
                 return AES;
             default:
@@ -111,6 +138,10 @@ public class JavaAlgorithm {
         return getJavaAlgorithm(algorithm).contains("ECDSA");
     }
 
+    public static boolean isEddsaJavaAlgorithm(String algorithm) {
+        return getJavaAlgorithm(algorithm).contains("Ed");
+    }
+
     public static boolean isHMACJavaAlgorithm(String algorithm) {
         return getJavaAlgorithm(algorithm).contains("HMAC");
     }

core/src/main/java/org/keycloak/crypto/KeyType.java

@@ -21,5 +21,6 @@ public interface KeyType {
     String EC = "EC";
     String RSA = "RSA";
     String OCT = "OCT";
+    String OKP = "OKP";
 
 }

core/src/main/java/org/keycloak/crypto/KeyWrapper.java

@@ -49,6 +49,7 @@ public class KeyWrapper {
     private X509Certificate certificate;
     private List<X509Certificate> certificateChain;
     private boolean isDefaultClientCertificate;
+    private String curve;
 
     public String getProviderId() {
         return providerId;
@@ -176,6 +177,14 @@ public class KeyWrapper {
         this.isDefaultClientCertificate = isDefaultClientCertificate;
     }
 
+    public void setCurve(String curve) {
+        this.curve = curve;
+    }
+
+    public String getCurve() {
+        return curve;
+    }
+
     public KeyWrapper cloneKey() {
         KeyWrapper key = new KeyWrapper();
         key.providerId = this.providerId;
@@ -189,6 +198,7 @@ public class KeyWrapper {
         key.publicKey = this.publicKey;
         key.privateKey = this.privateKey;
         key.certificate = this.certificate;
+        key.curve = this.curve;
         if (this.certificateChain != null) {
             key.certificateChain = new ArrayList<>(this.certificateChain);
         }

core/src/main/java/org/keycloak/jose/jwk/AbstractJWKBuilder.java

@@ -0,0 +1,138 @@
+/*
+ * Copyright 2016 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.jose.jwk;
+
+import static org.keycloak.jose.jwk.JWKUtil.toIntegerBytes;
+
+import java.security.Key;
+import java.security.PublicKey;
+import java.security.cert.X509Certificate;
+import java.security.interfaces.ECPublicKey;
+import java.security.interfaces.RSAPublicKey;
+import java.util.Collections;
+import java.util.List;
+
+import org.keycloak.common.util.Base64Url;
+import org.keycloak.common.util.KeyUtils;
+import org.keycloak.common.util.PemUtils;
+import org.keycloak.crypto.Algorithm;
+import org.keycloak.crypto.KeyType;
+import org.keycloak.crypto.KeyUse;
+
+/**
+ * @author <a href="mailto:sthorger@redhat.com">Stian Thorgersen</a>
+ */
+public abstract class AbstractJWKBuilder {
+
+    public static final KeyUse DEFAULT_PUBLIC_KEY_USE = KeyUse.SIG;
+
+    protected String kid;
+
+    protected String algorithm;
+
+    public JWK rs256(PublicKey key) {
+        this.algorithm = Algorithm.RS256;
+        return rsa(key);
+    }
+
+    public JWK rsa(Key key) {
+        return rsa(key, null, KeyUse.SIG);
+    }
+    
+    public JWK rsa(Key key, X509Certificate certificate) {
+        return rsa(key, Collections.singletonList(certificate), KeyUse.SIG);
+    }
+
+    public JWK rsa(Key key, List<X509Certificate> certificates) {
+        return rsa(key, certificates, null);
+    }
+
+    public JWK rsa(Key key, List<X509Certificate> certificates, KeyUse keyUse) {
+        RSAPublicKey rsaKey = (RSAPublicKey) key;
+
+        RSAPublicJWK k = new RSAPublicJWK();
+
+        String kid = this.kid != null ? this.kid : KeyUtils.createKeyId(key);
+        k.setKeyId(kid);
+        k.setKeyType(KeyType.RSA);
+        k.setAlgorithm(algorithm);
+        k.setPublicKeyUse(keyUse == null ? KeyUse.SIG.getSpecName() : keyUse.getSpecName());
+        k.setModulus(Base64Url.encode(toIntegerBytes(rsaKey.getModulus())));
+        k.setPublicExponent(Base64Url.encode(toIntegerBytes(rsaKey.getPublicExponent())));
+
+        if (certificates != null && !certificates.isEmpty()) {
+            String[] certificateChain = new String[certificates.size()];
+            for (int i = 0; i < certificates.size(); i++) {
+                certificateChain[i] = PemUtils.encodeCertificate(certificates.get(i));
+            }
+            k.setX509CertificateChain(certificateChain);
+        }
+
+        return k;
+    }
+
+    public JWK rsa(Key key, KeyUse keyUse) {
+        JWK k = rsa(key);
+        String keyUseString = keyUse == null ? DEFAULT_PUBLIC_KEY_USE.getSpecName() : keyUse.getSpecName();
+        if (KeyUse.ENC == keyUse) keyUseString = "enc";
+        k.setPublicKeyUse(keyUseString);
+        return k;
+    }
+
+    public JWK ec(Key key) {
+        return ec(key, DEFAULT_PUBLIC_KEY_USE);
+    }
+
+    public JWK ec(Key key, KeyUse keyUse) {
+        ECPublicKey ecKey = (ECPublicKey) key;
+
+        ECPublicJWK k = new ECPublicJWK();
+
+        String kid = this.kid != null ? this.kid : KeyUtils.createKeyId(key);
+        int fieldSize = ecKey.getParams().getCurve().getField().getFieldSize();
+
+        k.setKeyId(kid);
+        k.setKeyType(KeyType.EC);
+        k.setAlgorithm(algorithm);
+        k.setPublicKeyUse(keyUse == null ? DEFAULT_PUBLIC_KEY_USE.getSpecName() : keyUse.getSpecName());
+        k.setCrv("P-" + fieldSize);
+        k.setX(Base64Url.encode(toIntegerBytes(ecKey.getW().getAffineX(), fieldSize)));
+        k.setY(Base64Url.encode(toIntegerBytes(ecKey.getW().getAffineY(), fieldSize)));
+        
+        return k;
+    }
+
+    public abstract JWK okp(Key key);
+
+    public abstract JWK okp(Key key, KeyUse keyUse);
+
+    public static byte[] reverseBytes(byte[] array) {
+        if (array == null || array.length == 0) {
+            return null;
+        }
+
+        int length = array.length;
+        byte[] reversedArray = new byte[length];
+
+        for (int i = 0; i < length; i++) {
+            reversedArray[length - 1 - i] = array[i];
+        }
+
+        return reversedArray;
+    }
+}

core/src/main/java/org/keycloak/jose/jwk/AbstractJWKParser.java

@@ -0,0 +1,118 @@
+/*
+ * Copyright 2016 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.jose.jwk;
+
+import java.math.BigInteger;
+import java.security.KeyFactory;
+import java.security.PublicKey;
+import java.security.spec.ECParameterSpec;
+import java.security.spec.ECPoint;
+import java.security.spec.ECPublicKeySpec;
+import java.security.spec.RSAPublicKeySpec;
+
+import org.keycloak.common.crypto.CryptoIntegration;
+import org.keycloak.common.util.Base64Url;
+import org.keycloak.crypto.KeyType;
+
+/**
+ * @author <a href="mailto:sthorger@redhat.com">Stian Thorgersen</a>
+ */
+public abstract class AbstractJWKParser {
+
+    protected JWK jwk;
+
+    public JWK getJwk() {
+        return jwk;
+    }
+
+    public PublicKey toPublicKey() {
+        String keyType = jwk.getKeyType();
+        if (keyType.equals(KeyType.RSA)) {
+            return createRSAPublicKey();
+        } else if (keyType.equals(KeyType.EC)) {
+            return createECPublicKey();
+
+        } else {
+            throw new RuntimeException("Unsupported keyType " + keyType);
+        }
+    }
+
+    protected PublicKey createECPublicKey() {
+        /* Check if jwk.getOtherClaims return an empty map */
+        if (jwk.getOtherClaims().size() == 0) {
+            throw new RuntimeException("JWK Otherclaims map is empty.");
+        }
+
+        /* Try retrieving the necessary fields */
+        String crv = (String) jwk.getOtherClaims().get(ECPublicJWK.CRV);
+        String xStr = (String) jwk.getOtherClaims().get(ECPublicJWK.X);
+        String yStr = (String) jwk.getOtherClaims().get(ECPublicJWK.Y);
+
+        /* Check if the retrieving of necessary fields success */
+        if (crv == null || xStr == null || yStr == null) {
+            throw new RuntimeException("Fail to retrieve ECPublicJWK.CRV, ECPublicJWK.X or ECPublicJWK.Y field.");
+        }
+
+        BigInteger x = new BigInteger(1, Base64Url.decode(xStr));
+        BigInteger y = new BigInteger(1, Base64Url.decode(yStr));
+
+        String name;
+        switch (crv) {
+            case "P-256" :
+                name = "secp256r1";
+                break;
+            case "P-384" :
+                name = "secp384r1";
+                break;
+            case "P-521" :
+                name = "secp521r1";
+                break;
+            default :
+                throw new RuntimeException("Unsupported curve");
+        }
+
+        try {
+            
+            ECPoint point = new ECPoint(x, y);
+            ECParameterSpec params = CryptoIntegration.getProvider().createECParams(name);
+            ECPublicKeySpec pubKeySpec = new ECPublicKeySpec(point, params);
+
+            KeyFactory kf = CryptoIntegration.getProvider().getKeyFactory("ECDSA");
+            return kf.generatePublic(pubKeySpec);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    protected PublicKey createRSAPublicKey() {
+        BigInteger modulus = new BigInteger(1, Base64Url.decode(jwk.getOtherClaims().get(RSAPublicJWK.MODULUS).toString()));
+        BigInteger publicExponent = new BigInteger(1, Base64Url.decode(jwk.getOtherClaims().get(RSAPublicJWK.PUBLIC_EXPONENT).toString()));
+
+        try {
+            KeyFactory kf = KeyFactory.getInstance("RSA");
+            return kf.generatePublic(new RSAPublicKeySpec(modulus, publicExponent));
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public boolean isKeyTypeSupported(String keyType) {
+        return (RSAPublicJWK.RSA.equals(keyType) || ECPublicJWK.EC.equals(keyType));
+    }
+
+}

core/src/main/java/org/keycloak/jose/jwk/JWKBuilder.java

@@ -17,36 +17,14 @@
 
 package org.keycloak.jose.jwk;
 
-import java.util.Collections;
-import java.util.List;
-import org.keycloak.common.util.Base64Url;
-import org.keycloak.common.util.KeyUtils;
-import org.keycloak.common.util.PemUtils;
-import org.keycloak.crypto.Algorithm;
-import org.keycloak.crypto.KeyType;
 import org.keycloak.crypto.KeyUse;
 
 import java.security.Key;
-import java.security.PublicKey;
-import java.security.cert.X509Certificate;
-import java.security.interfaces.ECPublicKey;
-import java.security.interfaces.RSAPublicKey;
-
-import static org.keycloak.jose.jwk.JWKUtil.toIntegerBytes;
 
 /**
  * @author <a href="mailto:sthorger@redhat.com">Stian Thorgersen</a>
  */
-public class JWKBuilder {
+public class JWKBuilder extends AbstractJWKBuilder {
-
-    public static final KeyUse DEFAULT_PUBLIC_KEY_USE = KeyUse.SIG;
-
-    private String kid;
-
-    private String algorithm;
-
-    private JWKBuilder() {
-    }
 
     public static JWKBuilder create() {
         return new JWKBuilder();
@@ -62,75 +40,15 @@ public class JWKBuilder {
         return this;
     }
 
-    public JWK rs256(PublicKey key) {
+    @Override
-        algorithm(Algorithm.RS256);
+    public JWK okp(Key key) {
-        return rsa(key);
+        // not supported if jdk vesion < 17
+        throw new UnsupportedOperationException("EdDSA algorithms not supported in this JDK version");
     }
 
-    public JWK rsa(Key key) {
+    @Override
-        return rsa(key, null, KeyUse.SIG);
+    public JWK okp(Key key, KeyUse keyUse) {
-    }
+        // not supported if jdk version < 17
-    
+        throw new UnsupportedOperationException("EdDSA algorithms not supported in this JDK version");
-    public JWK rsa(Key key, X509Certificate certificate) {
-        return rsa(key, Collections.singletonList(certificate), KeyUse.SIG);
-    }
-
-    public JWK rsa(Key key, List<X509Certificate> certificates) {
-        return rsa(key, certificates, null);
-    }
-
-    public JWK rsa(Key key, List<X509Certificate> certificates, KeyUse keyUse) {
-        RSAPublicKey rsaKey = (RSAPublicKey) key;
-
-        RSAPublicJWK k = new RSAPublicJWK();
-
-        String kid = this.kid != null ? this.kid : KeyUtils.createKeyId(key);
-        k.setKeyId(kid);
-        k.setKeyType(KeyType.RSA);
-        k.setAlgorithm(algorithm);
-        k.setPublicKeyUse(keyUse == null ? KeyUse.SIG.getSpecName() : keyUse.getSpecName());
-        k.setModulus(Base64Url.encode(toIntegerBytes(rsaKey.getModulus())));
-        k.setPublicExponent(Base64Url.encode(toIntegerBytes(rsaKey.getPublicExponent())));
-
-        if (certificates != null && !certificates.isEmpty()) {
-            String[] certificateChain = new String[certificates.size()];
-            for (int i = 0; i < certificates.size(); i++) {
-                certificateChain[i] = PemUtils.encodeCertificate(certificates.get(i));
-            }
-            k.setX509CertificateChain(certificateChain);
-        }
-
-        return k;
-    }
-
-    public JWK rsa(Key key, KeyUse keyUse) {
-        JWK k = rsa(key);
-        String keyUseString = keyUse == null ? DEFAULT_PUBLIC_KEY_USE.getSpecName() : keyUse.getSpecName();
-        if (KeyUse.ENC == keyUse) keyUseString = "enc";
-        k.setPublicKeyUse(keyUseString);
-        return k;
-    }
-
-    public JWK ec(Key key) {
-        return ec(key, DEFAULT_PUBLIC_KEY_USE);
-    }
-
-    public JWK ec(Key key, KeyUse keyUse) {
-        ECPublicKey ecKey = (ECPublicKey) key;
-
-        ECPublicJWK k = new ECPublicJWK();
-
-        String kid = this.kid != null ? this.kid : KeyUtils.createKeyId(key);
-        int fieldSize = ecKey.getParams().getCurve().getField().getFieldSize();
-
-        k.setKeyId(kid);
-        k.setKeyType(KeyType.EC);
-        k.setAlgorithm(algorithm);
-        k.setPublicKeyUse(keyUse == null ? DEFAULT_PUBLIC_KEY_USE.getSpecName() : keyUse.getSpecName());
-        k.setCrv("P-" + fieldSize);
-        k.setX(Base64Url.encode(toIntegerBytes(ecKey.getW().getAffineX(), fieldSize)));
-        k.setY(Base64Url.encode(toIntegerBytes(ecKey.getW().getAffineY(), fieldSize)));
-        
-        return k;
     }
 }

core/src/main/java/org/keycloak/jose/jwk/JWKParser.java

@@ -17,28 +17,14 @@
 
 package org.keycloak.jose.jwk;
 
-
-import org.keycloak.common.crypto.CryptoIntegration;
-import org.keycloak.common.util.Base64Url;
-import org.keycloak.crypto.KeyType;
 import org.keycloak.util.JsonSerialization;
 
-import java.math.BigInteger;
-import java.security.KeyFactory;
-import java.security.PublicKey;
-import java.security.spec.ECParameterSpec;
-import java.security.spec.ECPoint;
-import java.security.spec.ECPublicKeySpec;
-import java.security.spec.RSAPublicKeySpec;
-
 /**
  * @author <a href="mailto:sthorger@redhat.com">Stian Thorgersen</a>
  */
-public class JWKParser {
+public class JWKParser extends AbstractJWKParser {
 
-    private JWK jwk;
+    protected JWKParser() {
-
-    private JWKParser() {
     }
 
     public JWKParser(JWK jwk) {
@@ -62,83 +48,4 @@ public class JWKParser {
         }
     }
 
-    public JWK getJwk() {
-        return jwk;
-    }
-
-    public PublicKey toPublicKey() {
-        String keyType = jwk.getKeyType();
-        if (keyType.equals(KeyType.RSA)) {
-            return createRSAPublicKey();
-        } else if (keyType.equals(KeyType.EC)) {
-            return createECPublicKey();
-
-        } else {
-            throw new RuntimeException("Unsupported keyType " + keyType);
-        }
-    }
-
-    private PublicKey createECPublicKey() {
-        /* Check if jwk.getOtherClaims return an empty map */
-        if (jwk.getOtherClaims().size() == 0) {
-            throw new RuntimeException("JWK Otherclaims map is empty.");
-        }
-
-        /* Try retrieving the necessary fields */
-        String crv = (String) jwk.getOtherClaims().get(ECPublicJWK.CRV);
-        String xStr = (String) jwk.getOtherClaims().get(ECPublicJWK.X);
-        String yStr = (String) jwk.getOtherClaims().get(ECPublicJWK.Y);
-
-        /* Check if the retrieving of necessary fields success */
-        if (crv == null || xStr == null || yStr == null) {
-            throw new RuntimeException("Fail to retrieve ECPublicJWK.CRV, ECPublicJWK.X or ECPublicJWK.Y field.");
-        }
-
-        BigInteger x = new BigInteger(1, Base64Url.decode(xStr));
-        BigInteger y = new BigInteger(1, Base64Url.decode(yStr));
-
-        String name;
-        switch (crv) {
-            case "P-256" :
-                name = "secp256r1";
-                break;
-            case "P-384" :
-                name = "secp384r1";
-                break;
-            case "P-521" :
-                name = "secp521r1";
-                break;
-            default :
-                throw new RuntimeException("Unsupported curve");
-        }
-
-        try {
-            
-            ECPoint point = new ECPoint(x, y);
-            ECParameterSpec params = CryptoIntegration.getProvider().createECParams(name);
-            ECPublicKeySpec pubKeySpec = new ECPublicKeySpec(point, params);
-
-            KeyFactory kf = CryptoIntegration.getProvider().getKeyFactory("ECDSA");
-            return kf.generatePublic(pubKeySpec);
-        } catch (Exception e) {
-            throw new RuntimeException(e);
-        }
-    }
-
-    private PublicKey createRSAPublicKey() {
-        BigInteger modulus = new BigInteger(1, Base64Url.decode(jwk.getOtherClaims().get(RSAPublicJWK.MODULUS).toString()));
-        BigInteger publicExponent = new BigInteger(1, Base64Url.decode(jwk.getOtherClaims().get(RSAPublicJWK.PUBLIC_EXPONENT).toString()));
-
-        try {
-            KeyFactory kf = KeyFactory.getInstance("RSA");
-            return kf.generatePublic(new RSAPublicKeySpec(modulus, publicExponent));
-        } catch (Exception e) {
-            throw new RuntimeException(e);
-        }
-    }
-
-    public boolean isKeyTypeSupported(String keyType) {
-        return (RSAPublicJWK.RSA.equals(keyType) || ECPublicJWK.EC.equals(keyType));
-    }
-
 }

core/src/main/java/org/keycloak/jose/jwk/OKPPublicJWK.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.jose.jwk;
+
+import org.keycloak.crypto.KeyType;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public class OKPPublicJWK extends JWK {
+
+    public static final String OKP = KeyType.OKP;
+
+    public static final String CRV = "crv";
+    public static final String X = "x";
+
+    @JsonProperty(CRV)
+    private String crv;
+
+    @JsonProperty(X)
+    private String x;
+
+    public String getCrv() {
+        return crv;
+    }
+
+    public void setCrv(String crv) {
+        this.crv = crv;
+    }
+
+    public String getX() {
+        return x;
+    }
+
+    public void setX(String x) {
+        this.x = x;
+    }
+
+}

core/src/main/java/org/keycloak/jose/jws/Algorithm.java

@@ -39,7 +39,10 @@ public enum Algorithm {
     PS512(AlgorithmType.RSA, null),
     ES256(AlgorithmType.ECDSA, null),
     ES384(AlgorithmType.ECDSA, null),
-    ES512(AlgorithmType.ECDSA, null)
+    ES512(AlgorithmType.ECDSA, null),
+    EdDSA(AlgorithmType.EDDSA, null),
+    Ed25519(AlgorithmType.EDDSA, null),
+    Ed448(AlgorithmType.EDDSA, null)
     ;
 
     private AlgorithmType type;

core/src/main/java/org/keycloak/jose/jws/AlgorithmType.java

@@ -26,6 +26,7 @@ public enum AlgorithmType {
     RSA,
     HMAC,
     AES,
-    ECDSA
+    ECDSA,
+    EDDSA
 
 }

core/src/main/java/org/keycloak/jose/jws/JWSBuilder.java

@@ -18,6 +18,7 @@
 package org.keycloak.jose.jws;
 
 import org.keycloak.common.util.Base64Url;
+import org.keycloak.crypto.JavaAlgorithm;
 import org.keycloak.crypto.SignatureSignerContext;
 import org.keycloak.jose.jws.crypto.HMACProvider;
 import org.keycloak.jose.jws.crypto.RSAProvider;
@@ -76,7 +77,13 @@ public class JWSBuilder {
 
     protected String encodeHeader(String sigAlgName) {
         StringBuilder builder = new StringBuilder("{");
+
+        if (org.keycloak.crypto.Algorithm.Ed25519.equals(sigAlgName) || org.keycloak.crypto.Algorithm.Ed448.equals(sigAlgName)) {
+            builder.append("\"alg\":\"").append(org.keycloak.crypto.Algorithm.EdDSA).append("\"");
+            builder.append(",\"crv\":\"").append(sigAlgName).append("\"");
+        } else {
             builder.append("\"alg\":\"").append(sigAlgName).append("\"");
+        }
 
         if (type != null) builder.append(",\"typ\" : \"").append(type).append("\"");
         if (kid != null) builder.append(",\"kid\" : \"").append(kid).append("\"");

core/src/main/java/org/keycloak/jose/jws/JWSHeader.java

@@ -22,6 +22,7 @@ import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.databind.ObjectMapper;
+
 import org.keycloak.jose.JOSEHeader;
 import org.keycloak.jose.jwk.JWK;
 

core/src/main/java/org/keycloak/util/JWKSUtils.java

@@ -27,6 +27,7 @@ import org.keycloak.jose.jwk.ECPublicJWK;
 import org.keycloak.jose.jwk.JSONWebKeySet;
 import org.keycloak.jose.jwk.JWK;
 import org.keycloak.jose.jwk.JWKParser;
+import org.keycloak.jose.jwk.OKPPublicJWK;
 import org.keycloak.jose.jwk.RSAPublicJWK;
 import org.keycloak.jose.jws.crypto.HashUtils;
 
@@ -125,6 +126,9 @@ public class JWKSUtils {
         if (jwk.getAlgorithm() != null) {
             keyWrapper.setAlgorithm(jwk.getAlgorithm());
         }
+        if (jwk.getOtherClaims().get(OKPPublicJWK.CRV) != null) {
+            keyWrapper.setCurve((String) jwk.getOtherClaims().get(OKPPublicJWK.CRV));
+        }
         keyWrapper.setType(jwk.getKeyType());
         keyWrapper.setUse(getKeyUse(jwk.getPublicKeyUse()));
         keyWrapper.setPublicKey(parser.toPublicKey());

core/src/main/java16/org/keycloak/jose/jwk/JWKBuilder.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.jose.jwk;
+
+import java.math.BigInteger;
+import java.security.Key;
+import java.security.interfaces.EdECPublicKey;
+import java.security.spec.EdECPoint;
+import java.util.Arrays;
+import java.util.Optional;
+
+import org.keycloak.common.util.Base64Url;
+import org.keycloak.common.util.KeyUtils;
+import org.keycloak.crypto.Algorithm;
+import org.keycloak.crypto.KeyType;
+import org.keycloak.crypto.KeyUse;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public class JWKBuilder extends AbstractJWKBuilder {
+
+    private JWKBuilder() {
+    }
+
+    public static JWKBuilder create() {
+        return new JWKBuilder();
+    }
+
+    public JWKBuilder kid(String kid) {
+        this.kid = kid;
+        return this;
+    }
+
+    public JWKBuilder algorithm(String algorithm) {
+        this.algorithm = algorithm;
+        return this;
+    }
+
+    @Override
+    public JWK okp(Key key) {
+        return okp(key, DEFAULT_PUBLIC_KEY_USE);
+    }
+
+    @Override
+    public JWK okp(Key key, KeyUse keyUse) {
+        EdECPublicKey eddsaPublicKey = (EdECPublicKey) key;
+
+        OKPPublicJWK k = new OKPPublicJWK();
+
+        String kid = this.kid != null ? this.kid : KeyUtils.createKeyId(key);
+
+        k.setKeyId(kid);
+        k.setKeyType(KeyType.OKP);
+        k.setAlgorithm(algorithm);
+        k.setPublicKeyUse(keyUse == null ? DEFAULT_PUBLIC_KEY_USE.getSpecName() : keyUse.getSpecName());
+        k.setCrv(eddsaPublicKey.getParams().getName());
+
+        Optional<String> x = edPublicKeyInJwkRepresentation(eddsaPublicKey);
+        k.setX(x.orElse(""));
+
+        return k;
+    }
+
+    private Optional<String> edPublicKeyInJwkRepresentation(EdECPublicKey eddsaPublicKey) {
+        EdECPoint edEcPoint = eddsaPublicKey.getPoint();
+        BigInteger yCoordinate = edEcPoint.getY();
+
+        // JWK representation "x" of a public key
+        int bytesLength = 0;
+        if (Algorithm.Ed25519.equals(eddsaPublicKey.getParams().getName())) {
+            bytesLength = 32;
+        } else if (Algorithm.Ed448.equals(eddsaPublicKey.getParams().getName())) {
+            bytesLength = 57;
+        } else {
+            return Optional.ofNullable(null);
+        }
+
+        // consider the case where yCoordinate.toByteArray() is less than bytesLength due to relatively small value of y-coordinate.
+        byte[] yCoordinateLittleEndianBytes = new byte[bytesLength];
+
+        // convert big endian representation of BigInteger to little endian representation of JWK representation (RFC 8032,8027)
+        yCoordinateLittleEndianBytes = Arrays.copyOf(reverseBytes(yCoordinate.toByteArray()), bytesLength);
+
+        // set a parity of x-coordinate to the most significant bit of the last octet (RFC 8032, 8037)
+        if (edEcPoint.isXOdd()) {
+            yCoordinateLittleEndianBytes[yCoordinateLittleEndianBytes.length - 1] |= -128; // 0b10000000
+        }
+
+        return Optional.ofNullable(Base64Url.encode(yCoordinateLittleEndianBytes));
+    }
+
+}

core/src/main/java16/org/keycloak/jose/jwk/JWKParser.java

@@ -0,0 +1,124 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.jose.jwk;
+
+import java.math.BigInteger;
+import java.security.KeyFactory;
+import java.security.NoSuchAlgorithmException;
+import java.security.PublicKey;
+import java.security.spec.EdECPoint;
+import java.security.spec.EdECPublicKeySpec;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.NamedParameterSpec;
+
+import org.keycloak.common.util.Base64Url;
+import org.keycloak.crypto.Algorithm;
+import org.keycloak.crypto.KeyType;
+import org.keycloak.util.JsonSerialization;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public class JWKParser extends AbstractJWKParser {
+
+    private JWKParser() {
+    }
+
+    public static JWKParser create() {
+        return new JWKParser();
+    }
+
+    public JWKParser(JWK jwk) {
+        this.jwk = jwk;
+    }
+
+    public static JWKParser create(JWK jwk) {
+        return new JWKParser(jwk);
+    }
+
+    public JWKParser parse(String jwk) {
+        try {
+            this.jwk = JsonSerialization.mapper.readValue(jwk, JWK.class);
+            return this;
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    public PublicKey toPublicKey() {
+        String keyType = jwk.getKeyType();
+        if (keyType.equals(KeyType.RSA)) {
+            return createRSAPublicKey();
+        } else if (keyType.equals(KeyType.EC)) {
+            return createECPublicKey();
+        } else if (keyType.equals(KeyType.OKP)) {
+            return createOKPPublicKey();
+        } else {
+            throw new RuntimeException("Unsupported keyType " + keyType);
+        }
+    }
+
+    private PublicKey createOKPPublicKey() {
+        String x = (String) jwk.getOtherClaims().get(OKPPublicJWK.X);
+        String crv = (String) jwk.getOtherClaims().get(OKPPublicJWK.CRV);
+        // JWK representation "x" of a public key
+        int bytesLength = 0;
+        if (Algorithm.Ed25519.equals(crv)) {
+            bytesLength = 32;
+        } else if (Algorithm.Ed448.equals(crv)) {
+            bytesLength = 57;
+        } else {
+            throw new RuntimeException("Invalid JWK representation of OKP type algorithm");
+        }
+
+        byte[] decodedX = Base64Url.decode(x);
+        if (decodedX.length != bytesLength) {
+            throw new RuntimeException("Invalid JWK representation of OKP type public key");
+        }
+
+        // x-coordinate's parity check shown by MSB(bit) of MSB(byte) of decoded "x": 1 is odd, 0 is even
+        boolean isOddX = false;
+        if ((decodedX[decodedX.length - 1] & -128) != 0) { // 0b10000000
+            isOddX = true;
+        }
+
+        // MSB(bit) of MSB(byte) showing x-coodinate's parity is set to 0
+        decodedX[decodedX.length - 1] &= 127; // 0b01111111
+
+        // both x and y-coordinate in twisted Edwards curve are always 0 or natural number
+        BigInteger y = new BigInteger(1, JWKBuilder.reverseBytes(decodedX));
+        NamedParameterSpec spec = new NamedParameterSpec(crv);
+        EdECPoint ep = new EdECPoint(isOddX, y);
+        EdECPublicKeySpec keySpec = new EdECPublicKeySpec(spec, ep);
+
+        PublicKey publicKey = null;
+        try {
+            publicKey = KeyFactory.getInstance(crv).generatePublic(keySpec);
+        } catch (InvalidKeySpecException | NoSuchAlgorithmException e) {
+            throw new RuntimeException(e);
+        }
+        return publicKey;
+    }
+
+    @Override
+    public boolean isKeyTypeSupported(String keyType) {
+        return (RSAPublicJWK.RSA.equals(keyType) || ECPublicJWK.EC.equals(keyType) || OKPPublicJWK.OKP.equals(keyType));
+    }
+
+}

js/apps/admin-ui/src/clients/add/__tests__/mock-serverinfo.json

@@ -756,6 +756,12 @@
            "ES256":{
               "order":0
            },
+           "Ed25519":{
+              "order":0
+           },
+           "Ed448":{
+              "order":0
+           },
            "RS256":{
               "order":0
            },
@@ -1517,6 +1523,12 @@
            "ES256":{
               "order":0
            },
+           "Ed25519":{
+              "order":0
+           },
+           "Ed448":{
+              "order":0
+           },
            "RS256":{
               "order":0
            },

js/apps/admin-ui/src/context/server-info/__tests__/mock.json

@@ -527,6 +527,8 @@
         "HS256": { "order": 0 },
         "HS512": { "order": 0 },
         "ES256": { "order": 0 },
+        "Ed25519": { "order": 0 },
+        "Ed448": { "order": 0 },
         "RS256": { "order": 0 },
         "HS384": { "order": 0 },
         "ES512": { "order": 0 },
@@ -927,6 +929,8 @@
         "HS256": { "order": 0 },
         "HS512": { "order": 0 },
         "ES256": { "order": 0 },
+        "Ed25519": { "order": 0 },
+        "Ed448": { "order": 0 },
         "RS256": { "order": 0 },
         "HS384": { "order": 0 },
         "ES512": { "order": 0 },

js/apps/admin-ui/src/realm-settings/keys/KeysListTab.tsx

@@ -235,6 +235,19 @@ export const KeysListTab = ({ realmComponents }: KeysListTabProps) => {
                     </Button>
                   </div>
                 );
+              } else if (type === "OKP") {
+                return (
+                  <Button
+                    onClick={() => {
+                      togglePublicKeyDialog();
+                      setPublicKey(publicKey!);
+                    }}
+                    variant="secondary"
+                    id="kc-public-key"
+                  >
+                    {t("publicKeys").slice(0, -1)}
+                  </Button>
+                );
               } else return "";
             },
             cellFormatters: [],

pom.xml

@@ -189,7 +189,7 @@
         <jboss.as.plugin.version>7.5.Final</jboss.as.plugin.version>
         <jmeter.plugin.version>1.9.0</jmeter.plugin.version>
         <jmeter.analysis.plugin.version>1.0.4</jmeter.analysis.plugin.version>
-        <osgi.bundle.plugin.version>2.4.0</osgi.bundle.plugin.version>
+        <osgi.bundle.plugin.version>5.1.8</osgi.bundle.plugin.version>
         <wildfly.plugin.version>2.0.1.Final</wildfly.plugin.version>
         <nexus.staging.plugin.version>1.6.13</nexus.staging.plugin.version>
         <frontend.plugin.version>1.14.2</frontend.plugin.version>

services/pom.xml

@@ -30,6 +30,14 @@
     <name>Keycloak REST Services</name>
     <description />
 
+    <properties>
+        <version.swagger.doclet>1.1.2</version.swagger.doclet>
+        <maven.compiler.plugin.version>3.8.1</maven.compiler.plugin.version>
+        <maven.compiler.release>17</maven.compiler.release>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+    </properties>
+
     <dependencies>
         <dependency>
             <groupId>org.keycloak</groupId>

services/src/main/java/org/keycloak/broker/oidc/OIDCIdentityProvider.java

@@ -585,12 +585,13 @@ public class OIDCIdentityProvider extends AbstractOAuth2IdentityProvider<OIDCIde
                 logger.debugf("Failed to verify token, key not found for algorithm %s", jws.getHeader().getRawAlgorithm());
                 return false;
             }
+            String algorithm = jws.getHeader().getRawAlgorithm();
             if (key.getAlgorithm() == null) {
-                key.setAlgorithm(jws.getHeader().getRawAlgorithm());
+                key.setAlgorithm(algorithm);
             }
-            SignatureProvider signatureProvider = session.getProvider(SignatureProvider.class, jws.getHeader().getRawAlgorithm());
+            SignatureProvider signatureProvider = session.getProvider(SignatureProvider.class, algorithm);
             if (signatureProvider == null) {
-                logger.debugf("Failed to verify token, signature provider not found for algorithm %s", jws.getHeader().getRawAlgorithm());
+                logger.debugf("Failed to verify token, signature provider not found for algorithm %s", algorithm);
                 return false;
             }
 

services/src/main/java/org/keycloak/crypto/ClientECDSASignatureVerifierContext.java

@@ -1,3 +1,20 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package org.keycloak.crypto;
 
 import org.keycloak.common.VerificationException;
@@ -6,6 +23,9 @@ import org.keycloak.keys.loader.PublicKeyStorageManager;
 import org.keycloak.models.ClientModel;
 import org.keycloak.models.KeycloakSession;
 
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
 public class ClientECDSASignatureVerifierContext extends AsymmetricSignatureVerifierContext {
     public ClientECDSASignatureVerifierContext(KeycloakSession session, ClientModel client, JWSInput input) throws VerificationException {
         super(getKey(session, client, input));

services/src/main/java/org/keycloak/crypto/ClientEdDSASignatureVerifierContext.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.crypto;
+
+import org.keycloak.common.VerificationException;
+import org.keycloak.jose.jws.JWSInput;
+import org.keycloak.keys.loader.PublicKeyStorageManager;
+import org.keycloak.models.ClientModel;
+import org.keycloak.models.KeycloakSession;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public class ClientEdDSASignatureVerifierContext extends AsymmetricSignatureVerifierContext {
+    public ClientEdDSASignatureVerifierContext(KeycloakSession session, ClientModel client, JWSInput input) throws VerificationException {
+        super(getKey(session, client, input));
+    }
+
+    private static KeyWrapper getKey(KeycloakSession session, ClientModel client, JWSInput input) throws VerificationException {
+        KeyWrapper key = PublicKeyStorageManager.getClientPublicKeyWrapper(session, client, input);
+        if (key == null) {
+            throw new VerificationException("Key not found");
+        }
+        if (!KeyType.OKP.equals(key.getType())) {
+            throw new VerificationException("Key Type is not OKP: " + key.getType());
+        }
+        if (key.getCurve() == null) {
+            throw new VerificationException("EdDSA key should have curve defined");
+        }
+        if (key.getAlgorithm() == null) {
+            // defaults to the algorithm set to the JWS
+            // validations should be performed prior to verifying signature in case there are restrictions on the algorithms
+            // that can used for signing
+            key.setAlgorithm(input.getHeader().getRawAlgorithm());
+        }
+        return key;
+    }
+
+}

services/src/main/java/org/keycloak/crypto/EdDSAClientSignatureVerifierProvider.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.crypto;
+
+import org.keycloak.common.VerificationException;
+import org.keycloak.jose.jws.JWSInput;
+import org.keycloak.models.ClientModel;
+import org.keycloak.models.KeycloakSession;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public class EdDSAClientSignatureVerifierProvider implements ClientSignatureVerifierProvider {
+    private final KeycloakSession session;
+    private final String algorithm;
+
+    public EdDSAClientSignatureVerifierProvider(KeycloakSession session, String algorithm) {
+        this.session = session;
+        this.algorithm = algorithm;
+    }
+
+    @Override
+    public SignatureVerifierContext verifier(ClientModel client, JWSInput input) throws VerificationException {
+        return new ClientEdDSASignatureVerifierContext(session, client, input);
+    }
+
+    @Override
+    public String getAlgorithm() {
+        return algorithm;
+    }
+
+    @Override
+    public boolean isAsymmetricAlgorithm() {
+        return true;
+    }
+}

services/src/main/java/org/keycloak/crypto/EdDSAClientSignatureVerifierProviderFactory.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.crypto;
+
+import org.keycloak.models.KeycloakSession;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public class EdDSAClientSignatureVerifierProviderFactory implements ClientSignatureVerifierProviderFactory {
+
+    public static final String ID = Algorithm.EdDSA;
+
+    @Override
+    public String getId() {
+        return ID;
+    }
+
+    @Override
+    public ClientSignatureVerifierProvider create(KeycloakSession session) {
+        return new EdDSAClientSignatureVerifierProvider(session, Algorithm.EdDSA);
+    }
+
+}

services/src/main/java/org/keycloak/crypto/EdDSASignatureProvider.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.crypto;
+
+import org.keycloak.common.VerificationException;
+import org.keycloak.models.KeycloakSession;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public class EdDSASignatureProvider implements SignatureProvider {
+
+    private final KeycloakSession session;
+
+    public EdDSASignatureProvider(KeycloakSession session) {
+        this.session = session;
+    }
+
+    @Override
+    public SignatureSignerContext signer() throws SignatureException {
+        return new ServerEdDSASignatureSignerContext(session, Algorithm.EdDSA);
+    }
+
+    @Override
+    public SignatureSignerContext signer(KeyWrapper key) throws SignatureException {
+        SignatureProvider.checkKeyForSignature(key, Algorithm.EdDSA, KeyType.OKP);
+        return new ServerEdDSASignatureSignerContext(key);
+    }
+
+    @Override
+    public SignatureVerifierContext verifier(String kid) throws VerificationException {
+        return new ServerEdDSASignatureVerifierContext(session, kid, Algorithm.EdDSA);
+    }
+
+    @Override
+    public SignatureVerifierContext verifier(KeyWrapper key) throws VerificationException {
+        SignatureProvider.checkKeyForVerification(key, Algorithm.EdDSA, KeyType.OKP);
+        return new ServerEdDSASignatureVerifierContext(key);
+    }
+
+    @Override
+    public boolean isAsymmetricAlgorithm() {
+        return true;
+    }
+
+}

services/src/main/java/org/keycloak/crypto/EdDSASignatureProviderFactory.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.keycloak.crypto;
+
+import org.keycloak.models.KeycloakSession;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public class EdDSASignatureProviderFactory implements SignatureProviderFactory {
+
+    public static final String ID = Algorithm.EdDSA;
+
+    @Override
+    public String getId() {
+        return ID;
+    }
+
+    @Override
+    public SignatureProvider create(KeycloakSession session) {
+        return new EdDSASignatureProvider(session);
+    }
+
+}

services/src/main/java/org/keycloak/crypto/ServerEdDSASignatureSignerContext.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.crypto;
+
+import org.keycloak.models.KeycloakSession;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public class ServerEdDSASignatureSignerContext extends AsymmetricSignatureSignerContext {
+
+    public ServerEdDSASignatureSignerContext(KeycloakSession session, String algorithm) throws SignatureException {
+        super(ServerAsymmetricSignatureSignerContext.getKey(session, algorithm));
+    }
+
+    public ServerEdDSASignatureSignerContext(KeyWrapper key) {
+        super(key);
+    }
+}

services/src/main/java/org/keycloak/crypto/ServerEdDSASignatureVerifierContext.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.crypto;
+
+import org.keycloak.common.VerificationException;
+import org.keycloak.models.KeycloakSession;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public class ServerEdDSASignatureVerifierContext extends  AsymmetricSignatureVerifierContext {
+    public ServerEdDSASignatureVerifierContext(KeycloakSession session, String kid, String algorithm) throws VerificationException {
+        super(ServerAsymmetricSignatureVerifierContext.getKey(session, kid, algorithm));
+    }
+
+    public ServerEdDSASignatureVerifierContext(KeyWrapper key) {
+        super(key);
+    }
+}

services/src/main/java/org/keycloak/keys/AbstractEddsaKeyProvider.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.keycloak.keys;
+
+import org.keycloak.common.util.KeyUtils;
+import org.keycloak.component.ComponentModel;
+import org.keycloak.crypto.Algorithm;
+import org.keycloak.crypto.KeyStatus;
+import org.keycloak.crypto.KeyType;
+import org.keycloak.crypto.KeyUse;
+import org.keycloak.crypto.KeyWrapper;
+import org.keycloak.models.RealmModel;
+
+import java.security.KeyPair;
+import java.util.stream.Stream;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public abstract class AbstractEddsaKeyProvider implements KeyProvider {
+
+    private final KeyStatus status;
+
+    private final ComponentModel model;
+
+    private final KeyWrapper key;
+
+    public AbstractEddsaKeyProvider(RealmModel realm, ComponentModel model) {
+        this.model = model;
+        this.status = KeyStatus.from(model.get(Attributes.ACTIVE_KEY, true), model.get(Attributes.ENABLED_KEY, true));
+
+        if (model.hasNote(KeyWrapper.class.getName())) {
+            key = model.getNote(KeyWrapper.class.getName());
+        } else {
+            key = loadKey(realm, model);
+            model.setNote(KeyWrapper.class.getName(), key);
+        }
+    }
+
+    protected abstract KeyWrapper loadKey(RealmModel realm, ComponentModel model);
+
+    @Override
+    public Stream<KeyWrapper> getKeysStream() {
+        return Stream.of(key);
+    }
+
+    protected KeyWrapper createKeyWrapper(KeyPair keyPair, String curveName) {
+        KeyWrapper key = new KeyWrapper();
+
+        key.setProviderId(model.getId());
+        key.setProviderPriority(model.get("priority", 0l));
+
+        key.setKid(KeyUtils.createKeyId(keyPair.getPublic()));
+        key.setUse(KeyUse.SIG);
+        key.setType(KeyType.OKP);
+        key.setAlgorithm(Algorithm.EdDSA);
+        key.setCurve(curveName);
+        key.setStatus(status);
+        key.setPrivateKey(keyPair.getPrivate());
+        key.setPublicKey(keyPair.getPublic());
+
+        return key;
+    }
+}

services/src/main/java/org/keycloak/keys/AbstractEddsaKeyProviderFactory.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.keycloak.keys;
+
+import org.keycloak.component.ComponentModel;
+import org.keycloak.component.ComponentValidationException;
+import org.keycloak.crypto.Algorithm;
+import org.keycloak.models.KeycloakSession;
+import org.keycloak.models.RealmModel;
+import org.keycloak.provider.ConfigurationValidationHelper;
+import org.keycloak.provider.ProviderConfigProperty;
+import org.keycloak.provider.ProviderConfigurationBuilder;
+
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+
+import static org.keycloak.provider.ProviderConfigProperty.LIST_TYPE;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public abstract class AbstractEddsaKeyProviderFactory implements KeyProviderFactory {
+
+    protected static final String EDDSA_PRIVATE_KEY_KEY = "eddsaPrivateKey";
+    protected static final String EDDSA_PUBLIC_KEY_KEY = "eddsaPublicKey";
+    protected static final String EDDSA_ELLIPTIC_CURVE_KEY = "eddsaEllipticCurveKey";
+    protected static final String DEFAULT_EDDSA_ELLIPTIC_CURVE = Algorithm.Ed25519;
+
+    protected static ProviderConfigProperty EDDSA_ELLIPTIC_CURVE_PROPERTY = new ProviderConfigProperty(EDDSA_ELLIPTIC_CURVE_KEY, 
+            "Elliptic Curve", "Elliptic Curve used in EdDSA", LIST_TYPE,
+            String.valueOf(DEFAULT_EDDSA_ELLIPTIC_CURVE), Algorithm.Ed25519, Algorithm.Ed448);
+ 
+    public final static ProviderConfigurationBuilder configurationBuilder() {
+        return ProviderConfigurationBuilder.create()
+                .property(Attributes.PRIORITY_PROPERTY)
+                .property(Attributes.ENABLED_PROPERTY)
+                .property(Attributes.ACTIVE_PROPERTY);
+    }
+
+    @Override
+    public void validateConfiguration(KeycloakSession session, RealmModel realm, ComponentModel model) throws ComponentValidationException {
+        ConfigurationValidationHelper.check(model)
+                .checkLong(Attributes.PRIORITY_PROPERTY, false)
+                .checkBoolean(Attributes.ENABLED_PROPERTY, false)
+                .checkBoolean(Attributes.ACTIVE_PROPERTY, false);
+    }
+
+    public static KeyPair generateEddsaKeyPair(String curveName) {
+        try {
+            KeyPairGenerator keyGen = KeyPairGenerator.getInstance(curveName);
+            return keyGen.generateKeyPair();
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+}

services/src/main/java/org/keycloak/keys/GeneratedEddsaKeyProvider.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.keycloak.keys;
+
+import org.jboss.logging.Logger;
+import org.keycloak.common.util.Base64;
+import org.keycloak.component.ComponentModel;
+import org.keycloak.crypto.KeyWrapper;
+import org.keycloak.models.RealmModel;
+
+import java.security.KeyFactory;
+import java.security.KeyPair;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.spec.PKCS8EncodedKeySpec;
+import java.security.spec.X509EncodedKeySpec;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public class GeneratedEddsaKeyProvider extends AbstractEddsaKeyProvider {
+    private static final Logger logger = Logger.getLogger(GeneratedEddsaKeyProvider.class);
+
+    public GeneratedEddsaKeyProvider(RealmModel realm, ComponentModel model) {
+        super(realm, model);
+    }
+
+    @Override
+    protected KeyWrapper loadKey(RealmModel realm, ComponentModel model) {
+        String privateEddsaKeyBase64Encoded = model.getConfig().getFirst(GeneratedEddsaKeyProviderFactory.EDDSA_PRIVATE_KEY_KEY);
+        String publicEddsaKeyBase64Encoded = model.getConfig().getFirst(GeneratedEddsaKeyProviderFactory.EDDSA_PUBLIC_KEY_KEY);
+        String curveName = model.getConfig().getFirst(GeneratedEddsaKeyProviderFactory.EDDSA_ELLIPTIC_CURVE_KEY);
+
+        try {
+            PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(Base64.decode(privateEddsaKeyBase64Encoded));
+            KeyFactory kf = KeyFactory.getInstance("EdDSA");
+            PrivateKey decodedPrivateKey = kf.generatePrivate(privateKeySpec);
+
+            X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(Base64.decode(publicEddsaKeyBase64Encoded));
+            PublicKey decodedPublicKey = kf.generatePublic(publicKeySpec);
+
+            KeyPair keyPair = new KeyPair(decodedPublicKey, decodedPrivateKey);
+
+            return createKeyWrapper(keyPair, curveName);
+        } catch (Exception e) {
+            logger.warnf("Exception at decodeEddsaPublicKey. %s", e.toString());
+            return null;
+        }
+
+    }
+
+}

services/src/main/java/org/keycloak/keys/GeneratedEddsaKeyProviderFactory.java

@@ -0,0 +1,141 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.keycloak.keys;
+
+import org.jboss.logging.Logger;
+import org.keycloak.common.util.Base64;
+import org.keycloak.common.util.MultivaluedHashMap;
+import org.keycloak.component.ComponentModel;
+import org.keycloak.component.ComponentValidationException;
+import org.keycloak.crypto.Algorithm;
+import org.keycloak.crypto.KeyUse;
+import org.keycloak.models.KeycloakSession;
+import org.keycloak.models.RealmModel;
+import org.keycloak.provider.ConfigurationValidationHelper;
+import org.keycloak.provider.ProviderConfigProperty;
+
+import java.security.KeyFactory;
+import java.security.KeyPair;
+import java.security.interfaces.EdECPublicKey;
+import java.security.spec.X509EncodedKeySpec;
+import java.util.List;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public class GeneratedEddsaKeyProviderFactory extends AbstractEddsaKeyProviderFactory {
+
+    private static final Logger logger = Logger.getLogger(GeneratedEddsaKeyProviderFactory.class);
+
+    public static final String ID = "eddsa-generated";
+
+    private static final String HELP_TEXT = "Generates EdDSA keys";
+
+    public static final String DEFAULT_EDDSA_ELLIPTIC_CURVE = Algorithm.Ed25519;
+
+    private static final List<ProviderConfigProperty> CONFIG_PROPERTIES = AbstractEddsaKeyProviderFactory.configurationBuilder()
+            .property(EDDSA_ELLIPTIC_CURVE_PROPERTY)
+            .build();
+
+    @Override
+    public KeyProvider create(KeycloakSession session, ComponentModel model) {
+        return new GeneratedEddsaKeyProvider(session.getContext().getRealm(), model);
+    }
+
+    @Override
+    public boolean createFallbackKeys(KeycloakSession session, KeyUse keyUse, String algorithm) {
+        if (keyUse.equals(KeyUse.SIG) && algorithm.equals(Algorithm.EdDSA)) {
+            RealmModel realm = session.getContext().getRealm();
+
+            ComponentModel generated = new ComponentModel();
+            generated.setName("fallback-" + algorithm);
+            generated.setParentId(realm.getId());
+            generated.setProviderId(ID);
+            generated.setProviderType(KeyProvider.class.getName());
+
+            MultivaluedHashMap<String, String> config = new MultivaluedHashMap<>();
+            config.putSingle(Attributes.PRIORITY_KEY, "-100");
+            config.putSingle(EDDSA_ELLIPTIC_CURVE_KEY, DEFAULT_EDDSA_ELLIPTIC_CURVE);
+            generated.setConfig(config);
+
+            realm.addComponentModel(generated);
+
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    @Override
+    public String getHelpText() {
+        return HELP_TEXT;
+    }
+
+    @Override
+    public List<ProviderConfigProperty> getConfigProperties() {
+        return CONFIG_PROPERTIES;
+    }
+
+    @Override
+    public String getId() {
+        return ID;
+    }
+
+    @Override
+    public void validateConfiguration(KeycloakSession session, RealmModel realm, ComponentModel model) throws ComponentValidationException {
+        super.validateConfiguration(session, realm, model);
+
+        ConfigurationValidationHelper.check(model).checkList(EDDSA_ELLIPTIC_CURVE_PROPERTY, false);
+
+        String curveName = model.get(EDDSA_ELLIPTIC_CURVE_KEY);
+        if (curveName == null) curveName = DEFAULT_EDDSA_ELLIPTIC_CURVE;
+
+        if (!(model.contains(EDDSA_PRIVATE_KEY_KEY) && model.contains(EDDSA_PUBLIC_KEY_KEY))) {
+            generateKeys(model, curveName);
+            logger.debugv("Generated keys for {0}", realm.getName());
+        } else {
+            String currentEdEc = getCurveFromPublicKey(model.getConfig().getFirst(GeneratedEddsaKeyProviderFactory.EDDSA_PUBLIC_KEY_KEY));
+            if (!curveName.equals(currentEdEc)) {
+                generateKeys(model, curveName);
+                logger.debugv("Twisted Edwards Curve changed, generating new keys for {0}", realm.getName());
+            }
+        }
+    }
+
+    private void generateKeys(ComponentModel model, String curveName) {
+        KeyPair keyPair;
+        try {
+            keyPair = generateEddsaKeyPair(curveName);
+            model.put(EDDSA_PRIVATE_KEY_KEY, Base64.encodeBytes(keyPair.getPrivate().getEncoded()));
+            model.put(EDDSA_PUBLIC_KEY_KEY, Base64.encodeBytes(keyPair.getPublic().getEncoded()));
+            model.put(EDDSA_ELLIPTIC_CURVE_KEY, curveName);
+        } catch (Throwable t) {
+            throw new ComponentValidationException("Failed to generate EdDSA keys", t);
+        }
+    }
+
+    private String getCurveFromPublicKey(String publicEddsaKeyBase64Encoded) {
+        try {
+            KeyFactory kf = KeyFactory.getInstance("EdDSA");
+            X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(Base64.decode(publicEddsaKeyBase64Encoded));
+            EdECPublicKey edEcKey = (EdECPublicKey) kf.generatePublic(publicKeySpec);
+            return edEcKey.getParams().getName();
+        } catch (Throwable t) {
+            throw new ComponentValidationException("Failed to get Twisted Edwards Curve from its public key", t);
+        }
+    }
+}

services/src/main/java/org/keycloak/keys/loader/HardcodedPublicKeyLoader.java

@@ -48,6 +48,9 @@ public class HardcodedPublicKeyLoader implements PublicKeyLoader {
             } else if (JavaAlgorithm.isECJavaAlgorithm(algorithm)) {
                 keyWrapper.setType(KeyType.EC);
                 keyWrapper.setPublicKey(PemUtils.decodePublicKey(encodedKey, KeyType.EC));
+            } else if (JavaAlgorithm.isEddsaJavaAlgorithm(algorithm)) {
+                keyWrapper.setType(KeyType.OKP);
+                keyWrapper.setPublicKey(PemUtils.decodePublicKey(encodedKey, KeyType.OKP));
             } else if (JavaAlgorithm.isHMACJavaAlgorithm(algorithm)) {
                 keyWrapper.setType(KeyType.OCT);
                 keyWrapper.setSecretKey(KeyUtils.loadSecretKey(Base64Url.decode(encodedKey), algorithm));

services/src/main/java/org/keycloak/keys/loader/PublicKeyStorageManager.java

@@ -19,6 +19,7 @@ package org.keycloak.keys.loader;
 
 import org.jboss.logging.Logger;
 import org.keycloak.broker.oidc.OIDCIdentityProviderConfig;
+import org.keycloak.crypto.Algorithm;
 import org.keycloak.crypto.KeyWrapper;
 import org.keycloak.jose.jwk.JWK;
 import org.keycloak.jose.jws.JWSInput;

services/src/main/java/org/keycloak/protocol/oidc/OIDCLoginProtocolService.java

@@ -220,6 +220,8 @@ public class OIDCLoginProtocolService {
                         return b.rsa(k.getPublicKey(), certificates, k.getUse());
                     } else if (k.getType().equals(KeyType.EC)) {
                         return b.ec(k.getPublicKey(), k.getUse());
+                    } else if (k.getType().equals(KeyType.OKP)) {
+                        return b.okp(k.getPublicKey(), k.getUse());
                     }
                     return null;
                 })

services/src/main/java/org/keycloak/protocol/oidc/endpoints/request/AuthzEndpointRequestObjectParser.java

@@ -21,7 +21,6 @@ import java.util.HashSet;
 import java.util.Set;
 import java.util.function.BiConsumer;
 
-import org.keycloak.OAuth2Constants;
 import org.keycloak.jose.JOSEHeader;
 import org.keycloak.jose.JOSE;
 import org.keycloak.jose.jwe.JWE;

services/src/main/resources/META-INF/services/org.keycloak.crypto.ClientSignatureVerifierProviderFactory

@@ -10,3 +10,4 @@ org.keycloak.crypto.PS512ClientSignatureVerifierProviderFactory
 org.keycloak.crypto.HS256ClientSignatureVerifierProviderFactory
 org.keycloak.crypto.HS384ClientSignatureVerifierProviderFactory
 org.keycloak.crypto.HS512ClientSignatureVerifierProviderFactory
+org.keycloak.crypto.EdDSAClientSignatureVerifierProviderFactory

services/src/main/resources/META-INF/services/org.keycloak.crypto.SignatureProviderFactory

@@ -10,3 +10,4 @@ org.keycloak.crypto.ES512SignatureProviderFactory
 org.keycloak.crypto.PS256SignatureProviderFactory
 org.keycloak.crypto.PS384SignatureProviderFactory
 org.keycloak.crypto.PS512SignatureProviderFactory
+org.keycloak.crypto.EdDSASignatureProviderFactory

services/src/main/resources/META-INF/services/org.keycloak.keys.KeyProviderFactory

@@ -23,3 +23,4 @@ org.keycloak.keys.ImportedRsaKeyProviderFactory
 org.keycloak.keys.GeneratedEcdsaKeyProviderFactory
 org.keycloak.keys.GeneratedRsaEncKeyProviderFactory
 org.keycloak.keys.ImportedRsaEncKeyProviderFactory
+org.keycloak.keys.GeneratedEddsaKeyProviderFactory

services/src/test/java/org/keycloak/jose/jwk/ServerJWKTest.java

@@ -0,0 +1,127 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.jose.jwk;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import java.nio.charset.StandardCharsets;
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.Signature;
+
+import org.junit.ClassRule;
+import org.junit.Test;
+import org.keycloak.common.util.KeyUtils;
+import org.keycloak.crypto.Algorithm;
+import org.keycloak.crypto.JavaAlgorithm;
+import org.keycloak.rule.CryptoInitRule;
+import org.keycloak.util.JsonSerialization;
+
+/**
+ * This is not tested in keycloak-core. The subclasses should be created in the crypto modules to make sure it is tested with corresponding modules (bouncycastle VS bouncycastle-fips)
+ *
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public abstract class ServerJWKTest {
+
+    @ClassRule
+    public static CryptoInitRule cryptoInitRule = new CryptoInitRule();
+
+
+    @Test
+    public void publicEd25519() throws Exception {
+        KeyPairGenerator keyGen = KeyPairGenerator.getInstance(Algorithm.Ed25519);
+        KeyPair keyPair = keyGen.generateKeyPair();
+
+        PublicKey publicKey = keyPair.getPublic();
+        JWK jwk = JWKBuilder.create().kid(KeyUtils.createKeyId(keyPair.getPublic())).algorithm(Algorithm.EdDSA).okp(publicKey);
+
+        assertEquals("OKP", jwk.getKeyType());
+        assertEquals("EdDSA", jwk.getAlgorithm());
+        assertEquals("sig", jwk.getPublicKeyUse());
+
+        assertTrue(jwk instanceof OKPPublicJWK);
+
+        OKPPublicJWK okpJwk = (OKPPublicJWK) jwk;
+
+        assertEquals("Ed25519", okpJwk.getCrv());
+        assertNotNull(okpJwk.getX());
+
+        String jwkJson = JsonSerialization.writeValueAsString(jwk);
+
+        JWKParser parser = JWKParser.create().parse(jwkJson);
+        PublicKey publicKeyFromJwk = parser.toPublicKey();
+
+        assertArrayEquals(publicKey.getEncoded(), publicKeyFromJwk.getEncoded());
+
+        byte[] data = "Some test string".getBytes(StandardCharsets.UTF_8);
+        byte[] sign = sign(data, JavaAlgorithm.Ed25519, keyPair.getPrivate());
+        verify(data, sign, JavaAlgorithm.Ed25519, publicKeyFromJwk);
+    }
+
+    @Test
+    public void publicEd448() throws Exception {
+        KeyPairGenerator keyGen = KeyPairGenerator.getInstance(Algorithm.Ed448);
+        KeyPair keyPair = keyGen.generateKeyPair();
+
+        PublicKey publicKey = keyPair.getPublic();
+        JWK jwk = JWKBuilder.create().kid(KeyUtils.createKeyId(keyPair.getPublic())).algorithm(Algorithm.EdDSA).okp(publicKey);
+
+        assertEquals("OKP", jwk.getKeyType());
+        assertEquals("EdDSA", jwk.getAlgorithm());
+        assertEquals("sig", jwk.getPublicKeyUse());
+
+        assertTrue(jwk instanceof OKPPublicJWK);
+
+        OKPPublicJWK okpJwk = (OKPPublicJWK) jwk;
+
+        assertEquals("Ed448", okpJwk.getCrv());
+        assertNotNull(okpJwk.getX());
+
+        String jwkJson = JsonSerialization.writeValueAsString(jwk);
+
+        JWKParser parser = JWKParser.create().parse(jwkJson);
+        PublicKey publicKeyFromJwk = parser.toPublicKey();
+
+        assertArrayEquals(publicKey.getEncoded(), publicKeyFromJwk.getEncoded());
+
+        byte[] data = "Some test string".getBytes(StandardCharsets.UTF_8);
+        byte[] sign = sign(data, JavaAlgorithm.Ed448, keyPair.getPrivate());
+        verify(data, sign, JavaAlgorithm.Ed448, publicKeyFromJwk);
+    }
+
+    private byte[] sign(byte[] data, String javaAlgorithm, PrivateKey key) throws Exception {
+        Signature signature = Signature.getInstance(javaAlgorithm);
+        signature.initSign(key);
+        signature.update(data);
+        return signature.sign();
+    }
+
+    private boolean verify(byte[] data, byte[] signature, String javaAlgorithm, PublicKey key) throws Exception {
+        Signature verifier = Signature.getInstance(javaAlgorithm);
+        verifier.initVerify(key);
+        verifier.update(data);
+        return verifier.verify(signature);
+    }
+
+}

testsuite/integration-arquillian/servers/auth-server/services/testsuite-providers/pom.xml

@@ -33,6 +33,10 @@
     <properties>
         <js-adapter.version>${project.version}</js-adapter.version>
         <js-adapter.file.path>${project.basedir}/target/classes/javascript</js-adapter.file.path>
+        <maven.compiler.plugin.version>3.8.1</maven.compiler.plugin.version>
+        <maven.compiler.release>17</maven.compiler.release>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
     </properties>
 
     <dependencies>

testsuite/integration-arquillian/servers/auth-server/services/testsuite-providers/src/main/java/org/keycloak/testsuite/rest/TestApplicationResourceProviderFactory.java

@@ -126,6 +126,7 @@ public class TestApplicationResourceProviderFactory implements RealmResourceProv
         private String keyType = KeyType.RSA;
         private String keyAlgorithm;
         private KeyUse keyUse = KeyUse.SIG;
+        private String curve;
 
         // Kid will be randomly generated (based on the key hash) if not provided here
         private String kid;
@@ -193,5 +194,13 @@ public class TestApplicationResourceProviderFactory implements RealmResourceProv
         public void setKid(String kid) {
             this.kid = kid;
         }
+
+        public String getCurve() {
+            return curve;
+        }
+
+        public void setCurve(String curve) {
+            this.curve = curve;
+        }
     }
 }

testsuite/integration-arquillian/servers/auth-server/services/testsuite-providers/src/main/java/org/keycloak/testsuite/rest/resource/TestingOIDCEndpointsApplicationResource.java

@@ -39,6 +39,7 @@ import org.keycloak.crypto.KeyUse;
 import org.keycloak.crypto.KeyWrapper;
 import org.keycloak.crypto.MacSignatureSignerContext;
 import org.keycloak.crypto.ServerECDSASignatureSignerContext;
+import org.keycloak.crypto.ServerEdDSASignatureSignerContext;
 import org.keycloak.crypto.SignatureSignerContext;
 import org.keycloak.jose.jwe.JWEConstants;
 import org.keycloak.jose.jwk.JSONWebKeySet;
@@ -88,9 +89,6 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.Set;
-import java.util.concurrent.BlockingQueue;
-import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 import java.util.stream.Stream;
 
@@ -121,6 +119,7 @@ public class TestingOIDCEndpointsApplicationResource {
     @Path("/generate-keys")
     @NoCache
     public Map<String, String> generateKeys(@QueryParam("jwaAlgorithm") String jwaAlgorithm,
+                                            @QueryParam("crv") String curve,
                                             @QueryParam("advertiseJWKAlgorithm") Boolean advertiseJWKAlgorithm,
                                             @QueryParam("keepExistingKeys") Boolean keepExistingKeys,
                                             @QueryParam("kid") String kid) {
@@ -152,6 +151,13 @@ public class TestingOIDCEndpointsApplicationResource {
                     keyType = KeyType.EC;
                     keyPair = generateEcdsaKey("secp521r1");
                     break;
+                case Algorithm.EdDSA:
+                    if (curve == null) {
+                        curve = Algorithm.Ed25519;
+                    }
+                    keyType = KeyType.OKP;
+                    keyPair = generateEddsaKey(curve);
+                    break;
                 case JWEConstants.RSA1_5:
                 case JWEConstants.RSA_OAEP:
                 case JWEConstants.RSA_OAEP_256:
@@ -168,6 +174,7 @@ public class TestingOIDCEndpointsApplicationResource {
             keyData.setKid(kid); // Can be null. It will be generated in that case
             keyData.setKeyPair(keyPair);
             keyData.setKeyType(keyType);
+            keyData.setCurve(curve);
             if (advertiseJWKAlgorithm == null || Boolean.TRUE.equals(advertiseJWKAlgorithm)) {
                 keyData.setKeyAlgorithm(jwaAlgorithm);
             } else {
@@ -190,6 +197,12 @@ public class TestingOIDCEndpointsApplicationResource {
         return keyPair;
     }
 
+    private KeyPair generateEddsaKey(String curveName) throws NoSuchAlgorithmException, InvalidAlgorithmParameterException {
+        KeyPairGenerator keyGen = KeyPairGenerator.getInstance(curveName);
+        KeyPair keyPair = keyGen.generateKeyPair();
+        return keyPair;
+    }
+
     @GET
     @Produces(MediaType.APPLICATION_JSON)
     @Path("/get-keys-as-pem")
@@ -238,6 +251,8 @@ public class TestingOIDCEndpointsApplicationResource {
                         return builder.rsa(keyPair.getPublic(), keyUse);
                     } else if (KeyType.EC.equals(keyType)) {
                         return builder.ec(keyPair.getPublic());
+                    } else if (KeyType.OKP.equals(keyType)) {
+                        return builder.okp(keyPair.getPublic());
                     } else {
                         throw new IllegalArgumentException("Unknown keyType: " + keyType);
                     }
@@ -326,6 +341,10 @@ public class TestingOIDCEndpointsApplicationResource {
                 case Algorithm.ES512:
                     signer = new ServerECDSASignatureSignerContext(keyWrapper);
                     break;
+                case Algorithm.EdDSA:
+                    keyWrapper.setCurve(keyData.getCurve());
+                    signer = new ServerEdDSASignatureSignerContext(keyWrapper);
+                    break;
                 default:
                     signer = new AsymmetricSignatureSignerContext(keyWrapper);
             }
@@ -374,6 +393,7 @@ public class TestingOIDCEndpointsApplicationResource {
             case Algorithm.ES256:
             case Algorithm.ES384:
             case Algorithm.ES512:
+            case Algorithm.EdDSA:
             case Algorithm.HS256:
             case Algorithm.HS384:
             case Algorithm.HS512:

testsuite/integration-arquillian/tests/base/src/main/java/org/keycloak/testsuite/client/resources/TestOIDCEndpointsApplicationResource.java

@@ -46,10 +46,16 @@ public interface TestOIDCEndpointsApplicationResource {
     @Path("/generate-keys")
     Map<String, String> generateKeys(@QueryParam("jwaAlgorithm") String jwaAlgorithm);
 
+    @GET
+    @Produces(MediaType.APPLICATION_JSON)
+    @Path("/generate-keys")
+    Map<String, String> generateKeys(@QueryParam("jwaAlgorithm") String jwaAlgorithm, @QueryParam("crv") String curve);
+
     /**
      * Generate single private/public keyPair
      *
      * @param jwaAlgorithm
+     * @param curve The crv for EdDSA
      * @param advertiseJWKAlgorithm whether algorithm should be adwertised in JWKS or not (Once the keys are returned by JWKS)
      * @param keepExistingKeys Should be existing keys kept replaced with newly generated keyPair. If it is not kept, then resulting JWK will contain single key. It is false by default.
      *                         The value 'true' is useful if we want to test with multiple client keys (For example mulitple keys set in the JWKS and test if correct key is picked)
@@ -60,6 +66,7 @@ public interface TestOIDCEndpointsApplicationResource {
     @Produces(MediaType.APPLICATION_JSON)
     @Path("/generate-keys")
     Map<String, String> generateKeys(@QueryParam("jwaAlgorithm") String jwaAlgorithm,
+                                     @QueryParam("crv") String curve,
                                      @QueryParam("advertiseJWKAlgorithm") Boolean advertiseJWKAlgorithm,
                                      @QueryParam("keepExistingKeys") Boolean keepExistingKeys,
                                      @QueryParam("kid") String kid);

testsuite/integration-arquillian/tests/base/src/main/java/org/keycloak/testsuite/util/OAuthClient.java

@@ -53,6 +53,7 @@ import org.keycloak.jose.jwk.JSONWebKeySet;
 import org.keycloak.jose.jwk.JWK;
 import org.keycloak.jose.jwk.JWKParser;
 import org.keycloak.jose.jws.JWSInput;
+import org.keycloak.jose.jwk.OKPPublicJWK;
 import org.keycloak.models.Constants;
 import org.keycloak.models.utils.KeycloakModelUtils;
 import org.keycloak.protocol.oidc.OIDCLoginProtocol;
@@ -1376,10 +1377,15 @@ public class OAuthClient {
     }
 
     public SignatureSignerContext createSigner(PrivateKey privateKey, String kid, String algorithm) {
+        return createSigner(privateKey, kid, algorithm, null);
+    }
+
+    public SignatureSignerContext createSigner(PrivateKey privateKey, String kid, String algorithm, String curve) {
         KeyWrapper keyWrapper = new KeyWrapper();
         keyWrapper.setAlgorithm(algorithm);
         keyWrapper.setKid(kid);
         keyWrapper.setPrivateKey(privateKey);
+        keyWrapper.setCurve(curve);
         SignatureSignerContext signer;
         switch (algorithm) {
             case Algorithm.ES256:
@@ -2199,6 +2205,9 @@ public class OAuthClient {
                 KeyWrapper key = new KeyWrapper();
                 key.setKid(k.getKeyId());
                 key.setAlgorithm(k.getAlgorithm());
+                if (k.getOtherClaims().get(OKPPublicJWK.CRV) != null) {
+                    key.setCurve((String) k.getOtherClaims().get(OKPPublicJWK.CRV));
+                }
                 key.setPublicKey(publicKey);
                 key.setUse(KeyUse.SIG);
 

testsuite/integration-arquillian/tests/base/src/main/java/org/keycloak/testsuite/util/TokenSignatureUtil.java

@@ -118,6 +118,10 @@ public class TokenSignatureUtil {
             case Algorithm.ES512:
                 registerKeyProvider(realm, "ecdsaEllipticCurveKey", convertAlgorithmToECDomainParamNistRep(jwaAlgorithmName), GeneratedEcdsaKeyProviderFactory.ID, adminClient, testContext);
                 break;
+            case Algorithm.Ed25519:
+            case Algorithm.Ed448:
+                registerKeyProvider(realm, "eddsaEllipticCurveKey", jwaAlgorithmName, "eddsa-generated", adminClient, testContext);
+                break;
         }
     }
 

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/admin/ServerInfoTest.java

@@ -71,8 +71,9 @@ public class ServerInfoTest extends AbstractKeycloakTest {
         Assert.assertNames(info.getCryptoInfo().getClientSignatureSymmetricAlgorithms(), Algorithm.HS256, Algorithm.HS384, Algorithm.HS512);
         Assert.assertNames(info.getCryptoInfo().getClientSignatureAsymmetricAlgorithms(),
                 Algorithm.ES256, Algorithm.ES384, Algorithm.ES512,
-                Algorithm.PS256, Algorithm.PS384, Algorithm.PS512,
+                Algorithm.EdDSA, Algorithm.PS256, Algorithm.PS384,
-                Algorithm.RS256, Algorithm.RS384, Algorithm.RS512);
+                Algorithm.PS512, Algorithm.RS256, Algorithm.RS384,
+                Algorithm.RS512);
 
         ComponentTypeRepresentation rsaGeneratedProviderInfo = info.getComponentTypes().get(KeyProvider.class.getName())
                 .stream()

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/client/CIBATest.java

@@ -1481,6 +1481,16 @@ public class CIBATest extends AbstractClientPoliciesTest {
         testBackchannelAuthenticationFlowWithSignedAuthenticationRequest(true, Algorithm.ES256);
     }
 
+    @Test
+    public void testBackchannelAuthenticationFlowWithSignedAuthenticationRequestEd25519Param() throws Exception {
+        testBackchannelAuthenticationFlowWithSignedAuthenticationRequest(false, Algorithm.EdDSA, Algorithm.Ed25519);
+    }
+
+    @Test
+    public void testBackchannelAuthenticationFlowWithSignedAuthenticationRequestEd448UriParam() throws Exception {
+        testBackchannelAuthenticationFlowWithSignedAuthenticationRequest(true, Algorithm.EdDSA, Algorithm.Ed448);
+    }
+
     @Test
     public void testBackchannelAuthenticationFlowWithInvalidSignedAuthenticationRequestUriParam() throws Exception {
         testBackchannelAuthenticationFlowWithInvalidSignedAuthenticationRequest(true, "none", 400, "None signed algorithm is not allowed");
@@ -2455,7 +2465,7 @@ public class CIBATest extends AbstractClientPoliciesTest {
             AuthorizationEndpointRequestObject sharedAuthenticationRequest = createValidSharedAuthenticationRequest();
             sharedAuthenticationRequest.setLoginHint(username);
             sharedAuthenticationRequest.setBindingMessage(bindingMessage);
-            registerSharedAuthenticationRequest(sharedAuthenticationRequest, clientId, requestedSigAlg, sigAlg, useRequestUri, clientSecret);
+            registerSharedAuthenticationRequest(sharedAuthenticationRequest, clientId, requestedSigAlg, sigAlg, useRequestUri, clientSecret, null);
 
             // user Backchannel Authentication Request
             AuthenticationRequestAcknowledgement response = oauth.doBackchannelAuthenticationRequest(clientId, clientSecret, null, null, null);
@@ -2498,6 +2508,10 @@ public class CIBATest extends AbstractClientPoliciesTest {
     }
 
     private void testBackchannelAuthenticationFlowWithSignedAuthenticationRequest(boolean useRequestUri, String sigAlg) throws Exception {
+        testBackchannelAuthenticationFlowWithSignedAuthenticationRequest(useRequestUri, sigAlg, null);
+    }
+
+    private void testBackchannelAuthenticationFlowWithSignedAuthenticationRequest(boolean useRequestUri, String sigAlg, String curve) throws Exception {
         ClientResource clientResource = null;
         ClientRepresentation clientRep = null;
         try {
@@ -2512,7 +2526,7 @@ public class CIBATest extends AbstractClientPoliciesTest {
             AuthorizationEndpointRequestObject sharedAuthenticationRequest = createValidSharedAuthenticationRequest();
             sharedAuthenticationRequest.setLoginHint(username);
             sharedAuthenticationRequest.setBindingMessage(bindingMessage);
-            registerSharedAuthenticationRequest(sharedAuthenticationRequest, TEST_CLIENT_NAME, sigAlg, useRequestUri);
+            registerSharedAuthenticationRequest(sharedAuthenticationRequest, TEST_CLIENT_NAME, sigAlg, sigAlg, useRequestUri, null, curve);
 
             // user Backchannel Authentication Request
             AuthenticationRequestAcknowledgement response = doBackchannelAuthenticationRequest(TEST_CLIENT_NAME, TEST_CLIENT_PASSWORD, null, null);
@@ -2567,7 +2581,7 @@ public class CIBATest extends AbstractClientPoliciesTest {
     }
 
     protected void registerSharedAuthenticationRequest(AuthorizationEndpointRequestObject requestObject, String clientId, String sigAlg, boolean isUseRequestUri, String clientSecret) throws URISyntaxException, IOException {
-        registerSharedAuthenticationRequest(requestObject, clientId, sigAlg, sigAlg, isUseRequestUri, clientSecret);
+        registerSharedAuthenticationRequest(requestObject, clientId, sigAlg, sigAlg, isUseRequestUri, clientSecret, null);
     }
 
     private boolean isSymmetricSigAlg(String sigAlg) {
@@ -2577,7 +2591,8 @@ public class CIBATest extends AbstractClientPoliciesTest {
         return false;
     }
 
-    protected void registerSharedAuthenticationRequest(AuthorizationEndpointRequestObject requestObject, String clientId, String requestedSigAlg, String sigAlg, boolean isUseRequestUri, String clientSecret) throws URISyntaxException, IOException {
+    protected void registerSharedAuthenticationRequest(AuthorizationEndpointRequestObject requestObject, String clientId,
+            String requestedSigAlg, String sigAlg, boolean isUseRequestUri, String clientSecret, String curve) throws URISyntaxException, IOException {
         TestOIDCEndpointsApplicationResource oidcClientEndpointsResource = testingClient.testApp().oidcClientEndpoints();
 
         // Set required signature for request_uri
@@ -2603,7 +2618,7 @@ public class CIBATest extends AbstractClientPoliciesTest {
             oidcClientEndpointsResource.registerOIDCRequestSymmetricSig(encodedRequestObject, sigAlg, clientSecret);
         } else {
             // generate and register client keypair
-            if (!"none".equals(sigAlg)) oidcClientEndpointsResource.generateKeys(sigAlg);
+            if (!"none".equals(sigAlg)) oidcClientEndpointsResource.generateKeys(sigAlg, curve);
 
             oidcClientEndpointsResource.registerOIDCRequest(encodedRequestObject, sigAlg);
         }

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/client/policies/AbstractClientPoliciesTest.java

@@ -474,6 +474,10 @@ public abstract class AbstractClientPoliciesTest extends AbstractKeycloakTest {
             case Algorithm.ES512:
                 keyAlg = KeyType.EC;
                 break;
+            case Algorithm.Ed25519:
+            case Algorithm.Ed448:
+                keyAlg = KeyType.OKP;
+                break;
             default :
                 throw new RuntimeException("Unsupported signature algorithm");
         }

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/oauth/AbstractClientAuthSignedJWTTest.java

@@ -0,0 +1,966 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.testsuite.oauth;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNotNull;
+
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.nio.file.Files;
+import java.security.KeyFactory;
+import java.security.KeyPair;
+import java.security.KeyStore;
+import java.security.NoSuchAlgorithmException;
+import java.security.NoSuchProviderException;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.cert.X509Certificate;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.PKCS8EncodedKeySpec;
+import java.security.spec.X509EncodedKeySpec;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import jakarta.ws.rs.core.Response;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpHeaders;
+import org.apache.http.HttpResponse;
+import org.apache.http.NameValuePair;
+import org.apache.http.client.HttpClient;
+import org.apache.http.client.entity.UrlEncodedFormEntity;
+import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.entity.mime.MultipartEntityBuilder;
+import org.apache.http.entity.mime.content.FileBody;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.impl.client.HttpClients;
+import org.apache.http.message.BasicNameValuePair;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.ClassRule;
+import org.junit.Rule;
+import org.junit.rules.TemporaryFolder;
+import org.keycloak.OAuth2Constants;
+import org.keycloak.OAuthErrorException;
+import org.keycloak.adapters.AdapterUtils;
+import org.keycloak.admin.client.resource.ClientAttributeCertificateResource;
+import org.keycloak.admin.client.resource.ClientResource;
+import org.keycloak.authentication.authenticators.client.JWTClientAuthenticator;
+import org.keycloak.common.constants.ServiceAccountConstants;
+import org.keycloak.common.crypto.CryptoIntegration;
+import org.keycloak.common.util.Base64;
+import org.keycloak.common.util.Base64Url;
+import org.keycloak.common.util.KeyUtils;
+import org.keycloak.common.util.KeycloakUriBuilder;
+import org.keycloak.common.util.KeystoreUtil;
+import org.keycloak.common.util.PemUtils;
+import org.keycloak.common.util.Time;
+import org.keycloak.common.util.UriUtils;
+import org.keycloak.common.util.KeystoreUtil.KeystoreFormat;
+import org.keycloak.constants.ServiceUrlConstants;
+import org.keycloak.crypto.Algorithm;
+import org.keycloak.crypto.ECDSAAlgorithm;
+import org.keycloak.crypto.ECDSASignatureProvider;
+import org.keycloak.crypto.KeyType;
+import org.keycloak.crypto.SignatureSignerContext;
+import org.keycloak.events.Details;
+import org.keycloak.events.EventType;
+import org.keycloak.jose.jwk.JSONWebKeySet;
+import org.keycloak.jose.jws.JWSBuilder;
+import org.keycloak.models.utils.KeycloakModelUtils;
+import org.keycloak.protocol.oidc.OIDCAdvancedConfigWrapper;
+import org.keycloak.protocol.oidc.OIDCConfigAttributes;
+import org.keycloak.protocol.oidc.client.authentication.JWTClientCredentialsProvider;
+import org.keycloak.representations.AccessToken;
+import org.keycloak.representations.JsonWebToken;
+import org.keycloak.representations.KeyStoreConfig;
+import org.keycloak.representations.RefreshToken;
+import org.keycloak.representations.idm.ClientRepresentation;
+import org.keycloak.representations.idm.EventRepresentation;
+import org.keycloak.representations.idm.RealmRepresentation;
+import org.keycloak.representations.idm.UserRepresentation;
+import org.keycloak.services.util.CertificateInfoHelper;
+import org.keycloak.testsuite.AbstractKeycloakTest;
+import org.keycloak.testsuite.Assert;
+import org.keycloak.testsuite.AssertEvents;
+import org.keycloak.testsuite.admin.ApiUtil;
+import org.keycloak.testsuite.auth.page.AuthRealm;
+import org.keycloak.testsuite.client.resources.TestApplicationResourceUrls;
+import org.keycloak.testsuite.client.resources.TestOIDCEndpointsApplicationResource;
+import org.keycloak.testsuite.rest.resource.TestingOIDCEndpointsApplicationResource;
+import org.keycloak.testsuite.util.ClientBuilder;
+import org.keycloak.testsuite.util.ClientManager;
+import org.keycloak.testsuite.util.KeystoreUtils;
+import org.keycloak.testsuite.util.OAuthClient;
+import org.keycloak.testsuite.util.RealmBuilder;
+import org.keycloak.testsuite.util.UserBuilder;
+import org.keycloak.util.JsonSerialization;
+
+public abstract class AbstractClientAuthSignedJWTTest extends AbstractKeycloakTest {
+
+    @Rule
+    public AssertEvents events = new AssertEvents(this);
+
+    @ClassRule
+    public static TemporaryFolder folder = new TemporaryFolder();
+
+    protected static KeystoreUtils.KeystoreInfo generatedKeystoreClient1;
+    protected static KeyPair keyPairClient1;
+
+    @BeforeClass
+    public static void generateClient1KeyPair() throws Exception {
+        generatedKeystoreClient1 = KeystoreUtils.generateKeystore(folder, KeystoreFormat.JKS, "clientkey", "storepass", "keypass");
+        PublicKey publicKey = PemUtils.decodePublicKey(generatedKeystoreClient1.getCertificateInfo().getPublicKey());
+        PrivateKey privateKey = PemUtils.decodePrivateKey(generatedKeystoreClient1.getCertificateInfo().getPrivateKey());
+        keyPairClient1 = new KeyPair(publicKey, privateKey);
+    }
+
+    protected static String client1SAUserId;
+
+    protected static RealmRepresentation testRealm;
+    protected static ClientRepresentation app1, app2, app3;
+    protected static UserRepresentation defaultUser, serviceAccountUser;
+
+    @Override
+    public void beforeAbstractKeycloakTest() throws Exception {
+        super.beforeAbstractKeycloakTest();
+    }
+
+    @Override
+    public void addTestRealms(List<RealmRepresentation> testRealms) {
+        RealmBuilder realmBuilder = RealmBuilder.create().name("test")
+                .testEventListener();
+
+        app1 = ClientBuilder.create()
+                .id(KeycloakModelUtils.generateId())
+                .clientId("client1")
+                .attribute(JWTClientAuthenticator.CERTIFICATE_ATTR, generatedKeystoreClient1.getCertificateInfo().getCertificate())
+                .attribute(OIDCConfigAttributes.USE_REFRESH_TOKEN_FOR_CLIENT_CREDENTIALS_GRANT, "true")
+                .authenticatorType(JWTClientAuthenticator.PROVIDER_ID)
+                .serviceAccountsEnabled(true)
+                .build();
+
+        realmBuilder.client(app1);
+
+        app2 = ClientBuilder.create()
+                .id(KeycloakModelUtils.generateId())
+                .clientId("client2")
+                .directAccessGrants()
+                .serviceAccountsEnabled(true)
+                .redirectUris(OAuthClient.APP_ROOT + "/auth")
+                .attribute(JWTClientAuthenticator.CERTIFICATE_ATTR, "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")
+                .authenticatorType(JWTClientAuthenticator.PROVIDER_ID)
+                .build();
+
+        realmBuilder.client(app2);
+
+        defaultUser = UserBuilder.create()
+                .id(KeycloakModelUtils.generateId())
+                //.serviceAccountId(app1.getClientId())
+                .username("test-user@localhost")
+                .password("password")
+                .build();
+        realmBuilder.user(defaultUser);
+
+        client1SAUserId = KeycloakModelUtils.generateId();
+
+        serviceAccountUser = UserBuilder.create()
+                .id(client1SAUserId)
+                .username(ServiceAccountConstants.SERVICE_ACCOUNT_USER_PREFIX + app1.getClientId())
+                .serviceAccountId(app1.getClientId())
+                .build();
+        realmBuilder.user(serviceAccountUser);
+
+        testRealm = realmBuilder.build();
+        testRealms.add(testRealm);
+    }
+
+    @Before
+    public void recreateApp3() {
+        app3 = ClientBuilder.create()
+                .id(KeycloakModelUtils.generateId())
+                .clientId("client3")
+                .directAccessGrants()
+                .authenticatorType(JWTClientAuthenticator.PROVIDER_ID)
+                .build();
+
+        Response resp = adminClient.realm("test").clients().create(app3);
+        getCleanup().addClientUuid(ApiUtil.getCreatedId(resp));
+        resp.close();
+    }
+
+    public void testCodeToTokenRequestSuccess(String algorithm) throws Exception {
+        oauth.clientId("client2");
+        oauth.doLogin("test-user@localhost", "password");
+        EventRepresentation loginEvent = events.expectLogin()
+                .client("client2")
+                .assertEvent();
+
+        String code = oauth.getCurrentQuery().get(OAuth2Constants.CODE);
+        OAuthClient.AccessTokenResponse response = doAccessTokenRequest(code, getClient2SignedJWT(algorithm));
+
+        assertEquals(200, response.getStatusCode());
+        oauth.verifyToken(response.getAccessToken());
+        oauth.parseRefreshToken(response.getRefreshToken());
+        events.expectCodeToToken(loginEvent.getDetails().get(Details.CODE_ID), loginEvent.getSessionId())
+                .client("client2")
+                .detail(Details.CLIENT_AUTH_METHOD, JWTClientAuthenticator.PROVIDER_ID)
+                .assertEvent();
+    }
+
+    public void testCodeToTokenRequestSuccessForceAlgInClient(String algorithm) throws Exception {
+        ClientManager.realm(adminClient.realm("test")).clientId("client2")
+                .updateAttribute(OIDCConfigAttributes.TOKEN_ENDPOINT_AUTH_SIGNING_ALG, algorithm);
+        try {
+            testCodeToTokenRequestSuccess(algorithm);
+        } finally {
+            ClientManager.realm(adminClient.realm("test")).clientId("client2")
+                    .updateAttribute(OIDCConfigAttributes.TOKEN_ENDPOINT_AUTH_SIGNING_ALG, null);
+        }
+    }
+
+    protected void testECDSASignatureLength(String clientSignedToken, String alg) {
+        String encodedSignature = clientSignedToken.split("\\.",3)[2];
+        byte[] signature = Base64Url.decode(encodedSignature);
+        assertEquals(ECDSAAlgorithm.getSignatureLength(alg), signature.length);
+    }
+
+    protected String getClientSignedToken(String alg) throws Exception {
+        ClientRepresentation clientRepresentation = app2;
+        ClientResource clientResource = getClient(testRealm.getRealm(), clientRepresentation.getId());
+        clientRepresentation = clientResource.toRepresentation();
+        String clientSignedToken;
+        try {
+            // setup Jwks
+            KeyPair keyPair = setupJwksUrl(alg, clientRepresentation, clientResource);
+            PublicKey publicKey = keyPair.getPublic();
+            PrivateKey privateKey = keyPair.getPrivate();
+
+            // test
+            oauth.clientId("client2");
+            oauth.doLogin("test-user@localhost", "password");
+
+            String code = oauth.getCurrentQuery().get(OAuth2Constants.CODE);
+            clientSignedToken = createSignedRequestToken("client2", getRealmInfoUrl(), privateKey, publicKey, alg);
+            OAuthClient.AccessTokenResponse response = doAccessTokenRequest(code, clientSignedToken);
+
+            assertEquals(200, response.getStatusCode());
+            oauth.verifyToken(response.getAccessToken());
+            oauth.idTokenHint(response.getIdToken()).openLogout();
+            return clientSignedToken;
+        } finally {
+            // Revert jwks_url settings
+            revertJwksUriSettings(clientRepresentation, clientResource);
+        }
+    }
+
+    protected void testCodeToTokenRequestSuccess(String algorithm, boolean useJwksUri) throws Exception {
+        testCodeToTokenRequestSuccess(algorithm, null, useJwksUri);
+    }
+
+    protected void testCodeToTokenRequestSuccess(String algorithm, String curve, boolean useJwksUri) throws Exception {
+        ClientRepresentation clientRepresentation = app2;
+        ClientResource clientResource = getClient(testRealm.getRealm(), clientRepresentation.getId());
+        clientRepresentation = clientResource.toRepresentation();
+        try {
+            // setup Jwks
+            KeyPair keyPair;
+            if (useJwksUri) {
+                keyPair = setupJwksUrl(algorithm, curve, true, false, null, clientRepresentation, clientResource);
+            } else {
+                keyPair = setupJwks(algorithm, curve, clientRepresentation, clientResource);
+            }
+            PublicKey publicKey = keyPair.getPublic();
+            PrivateKey privateKey = keyPair.getPrivate();
+
+            // test
+            oauth.clientId("client2");
+            oauth.doLogin("test-user@localhost", "password");
+            EventRepresentation loginEvent = events.expectLogin()
+                    .client("client2")
+                    .assertEvent();
+
+            String code = oauth.getCurrentQuery().get(OAuth2Constants.CODE);
+            OAuthClient.AccessTokenResponse response = doAccessTokenRequest(code,
+                    createSignedRequestToken("client2", getRealmInfoUrl(), privateKey, publicKey, algorithm, curve));
+
+            assertEquals(200, response.getStatusCode());
+            oauth.verifyToken(response.getAccessToken());
+            oauth.parseRefreshToken(response.getRefreshToken());
+            events.expectCodeToToken(loginEvent.getDetails().get(Details.CODE_ID), loginEvent.getSessionId())
+                    .client("client2")
+                    .detail(Details.CLIENT_AUTH_METHOD, JWTClientAuthenticator.PROVIDER_ID)
+                    .assertEvent();
+        } finally {
+            // Revert jwks settings
+            if (useJwksUri) {
+                revertJwksUriSettings(clientRepresentation, clientResource);
+            } else {
+                revertJwksSettings(clientRepresentation, clientResource);
+            }
+        }
+    }
+
+    protected void testDirectGrantRequestSuccess(String algorithm) throws Exception {
+        ClientRepresentation clientRepresentation = app2;
+        ClientResource clientResource = getClient(testRealm.getRealm(), clientRepresentation.getId());
+        clientRepresentation = clientResource.toRepresentation();
+        try {
+            // setup Jwks
+            KeyPair keyPair = setupJwksUrl(algorithm, clientRepresentation, clientResource);
+            PublicKey publicKey = keyPair.getPublic();
+            PrivateKey privateKey = keyPair.getPrivate();
+
+            // test
+            oauth.clientId("client2");
+            OAuthClient.AccessTokenResponse response = doGrantAccessTokenRequest("test-user@localhost", "password", createSignedRequestToken("client2", getRealmInfoUrl(), privateKey, publicKey, algorithm));
+
+            assertEquals(200, response.getStatusCode());
+            AccessToken accessToken = oauth.verifyToken(response.getAccessToken());
+            RefreshToken refreshToken = oauth.parseRefreshToken(response.getRefreshToken());
+
+            events.expectLogin()
+                    .client("client2")
+                    .session(accessToken.getSessionState())
+                    .detail(Details.GRANT_TYPE, OAuth2Constants.PASSWORD)
+                    .detail(Details.TOKEN_ID, accessToken.getId())
+                    .detail(Details.REFRESH_TOKEN_ID, refreshToken.getId())
+                    .detail(Details.USERNAME, "test-user@localhost")
+                    .detail(Details.CLIENT_AUTH_METHOD, JWTClientAuthenticator.PROVIDER_ID)
+                    .removeDetail(Details.CODE_ID)
+                    .removeDetail(Details.REDIRECT_URI)
+                    .removeDetail(Details.CONSENT)
+                    .assertEvent();
+        } finally {
+            // Revert jwks_url settings
+            revertJwksUriSettings(clientRepresentation, clientResource);
+        }
+    }
+
+    protected void testClientWithGeneratedKeys(String format) throws Exception {
+        ClientRepresentation client = app3;
+        UserRepresentation user = defaultUser;
+        final String keyAlias = "somekey";
+        final String keyPassword = "pwd1";
+        final String storePassword = "pwd2";
+
+
+        // Generate new keystore (which is intended for sending to the user and store in a client app)
+        // with public/private keys; in KC, store the certificate itself
+
+        KeyStoreConfig keyStoreConfig = new KeyStoreConfig();
+        keyStoreConfig.setFormat(format);
+        keyStoreConfig.setKeyPassword(keyPassword);
+        keyStoreConfig.setStorePassword(storePassword);
+        keyStoreConfig.setKeyAlias(keyAlias);
+
+        client = getClient(testRealm.getRealm(), client.getId()).toRepresentation();
+        final String certOld = client.getAttributes().get(JWTClientAuthenticator.CERTIFICATE_ATTR);
+
+        // Generate the keystore and save the new certificate in client (in KC)
+        byte[] keyStoreBytes = getClientAttributeCertificateResource(testRealm.getRealm(), client.getId())
+                .generateAndGetKeystore(keyStoreConfig);
+
+        ByteArrayInputStream keyStoreIs = new ByteArrayInputStream(keyStoreBytes);
+        KeyStore keyStore = getKeystore(keyStoreIs, storePassword, format);
+        keyStoreIs.close();
+
+        client = getClient(testRealm.getRealm(), client.getId()).toRepresentation();
+        X509Certificate x509Cert = (X509Certificate) keyStore.getCertificate(keyAlias);
+
+        assertCertificate(client, certOld,
+                KeycloakModelUtils.getPemFromCertificate(x509Cert));
+
+
+        // Try to login with the new keys
+
+        oauth.clientId(client.getClientId());
+        PrivateKey privateKey = (PrivateKey) keyStore.getKey(keyAlias, keyPassword.toCharArray());
+        KeyPair keyPair = new KeyPair(x509Cert.getPublicKey(), privateKey);
+
+        OAuthClient.AccessTokenResponse response = doGrantAccessTokenRequest(user.getUsername(),
+                                                      user.getCredentials().get(0).getValue(),
+                                                        getClientSignedJWT(keyPair, client.getClientId()));
+
+        assertEquals(200, response.getStatusCode());
+
+        AccessToken accessToken = oauth.verifyToken(response.getAccessToken());
+        RefreshToken refreshToken = oauth.parseRefreshToken(response.getRefreshToken());
+
+        events.expectLogin()
+                .client(client.getClientId())
+                .session(accessToken.getSessionState())
+                .detail(Details.GRANT_TYPE, OAuth2Constants.PASSWORD)
+                .detail(Details.TOKEN_ID, accessToken.getId())
+                .detail(Details.REFRESH_TOKEN_ID, refreshToken.getId())
+                .detail(Details.USERNAME, user.getUsername())
+                .detail(Details.CLIENT_AUTH_METHOD, JWTClientAuthenticator.PROVIDER_ID)
+                .removeDetail(Details.CODE_ID)
+                .removeDetail(Details.REDIRECT_URI)
+                .removeDetail(Details.CONSENT)
+                .assertEvent();
+    }
+
+
+    // We need to test this as a genuine REST API HTTP request
+    // since there's no easy and direct way to call ClientAttributeCertificateResource.uploadJksCertificate
+    // (and especially to create MultipartFormDataInput)
+    protected void testUploadKeystore(String keystoreFormat, String filePath, String keyAlias, String storePassword) throws Exception {
+        ClientRepresentation client = getClient(testRealm.getRealm(), app3.getId()).toRepresentation();
+        final String certOld = client.getAttributes().get(JWTClientAuthenticator.CERTIFICATE_ATTR);
+
+        // Load the keystore file
+        URL fileUrl = (getClass().getClassLoader().getResource(filePath));
+        File keystoreFile = fileUrl != null ? new File(fileUrl.getFile()) : new File(filePath);
+        if (!keystoreFile.exists()) {
+            throw new IOException("File not found: " + keystoreFile.getAbsolutePath());
+        }
+
+        // Get admin access token, no matter it's master realm's admin
+        OAuthClient.AccessTokenResponse accessTokenResponse = oauth.doGrantAccessTokenRequest(
+                AuthRealm.MASTER, AuthRealm.ADMIN, AuthRealm.ADMIN, null, "admin-cli", null);
+        assertEquals(200, accessTokenResponse.getStatusCode());
+
+        final String url = suiteContext.getAuthServerInfo().getContextRoot()
+                + "/auth/admin/realms/" + testRealm.getRealm()
+                + "/clients/" + client.getId() + "/certificates/jwt.credential/upload-certificate";
+
+        // Prepare the HTTP request
+        FileBody fileBody = new FileBody(keystoreFile);
+        HttpEntity entity = MultipartEntityBuilder.create()
+                .addPart("file", fileBody)
+                .addTextBody("keystoreFormat", keystoreFormat)
+                .addTextBody("keyAlias", keyAlias)
+                .addTextBody("storePassword", storePassword)
+                .addTextBody("keyPassword", "undefined")
+                .build();
+        HttpPost httpRequest = new HttpPost(url);
+        httpRequest.setHeader(HttpHeaders.AUTHORIZATION, "Bearer " + accessTokenResponse.getAccessToken());
+        httpRequest.setEntity(entity);
+
+        // Send the request
+        HttpClient httpClient = HttpClients.createDefault();
+        HttpResponse httpResponse = httpClient.execute(httpRequest);
+        assertEquals(200, httpResponse.getStatusLine().getStatusCode());
+
+        client = getClient(testRealm.getRealm(), client.getId()).toRepresentation();
+
+        // Assert the uploaded certificate
+        if (keystoreFormat.equals(org.keycloak.services.resources.admin.ClientAttributeCertificateResource.PUBLIC_KEY_PEM)) {
+            String pem = new String(Files.readAllBytes(keystoreFile.toPath()));
+            final String publicKeyNew = client.getAttributes().get(JWTClientAuthenticator.ATTR_PREFIX + "." + CertificateInfoHelper.PUBLIC_KEY);
+            assertEquals("Certificates don't match", pem, publicKeyNew);
+        } else if (keystoreFormat.equals(org.keycloak.services.resources.admin.ClientAttributeCertificateResource.JSON_WEB_KEY_SET)) {
+            final String publicKeyNew = client.getAttributes().get(JWTClientAuthenticator.ATTR_PREFIX + "." + CertificateInfoHelper.PUBLIC_KEY);
+            // Just assert it's valid public key
+            PublicKey pk = KeycloakModelUtils.getPublicKey(publicKeyNew);
+            Assert.assertNotNull(pk);
+        } else if (keystoreFormat.equals(org.keycloak.services.resources.admin.ClientAttributeCertificateResource.CERTIFICATE_PEM)) {
+            String pem = new String(Files.readAllBytes(keystoreFile.toPath()));
+            assertCertificate(client, certOld, pem);
+        } else {
+            InputStream keystoreIs = new FileInputStream(keystoreFile);
+            KeyStore keyStore = getKeystore(keystoreIs, storePassword, keystoreFormat);
+            keystoreIs.close();
+            String pem = KeycloakModelUtils.getPemFromCertificate((X509Certificate) keyStore.getCertificate(keyAlias));
+            assertCertificate(client, certOld, pem);
+        }
+    }
+
+    protected void testEndpointAsAudience(String endpointUrl) throws Exception {
+        ClientRepresentation clientRepresentation = app2;
+        ClientResource clientResource = getClient(testRealm.getRealm(), clientRepresentation.getId());
+        clientRepresentation = clientResource.toRepresentation();
+        try {
+            KeyPair keyPair = setupJwksUrl(Algorithm.PS256, clientRepresentation, clientResource);
+            PublicKey publicKey = keyPair.getPublic();
+            PrivateKey privateKey = keyPair.getPrivate();
+            JsonWebToken assertion = createRequestToken(app2.getClientId(), getRealmInfoUrl());
+
+            assertion.audience(endpointUrl);
+
+            List<NameValuePair> parameters = new LinkedList<NameValuePair>();
+            parameters.add(new BasicNameValuePair(OAuth2Constants.GRANT_TYPE, OAuth2Constants.CLIENT_CREDENTIALS));
+            parameters
+                .add(new BasicNameValuePair(OAuth2Constants.CLIENT_ASSERTION_TYPE, OAuth2Constants.CLIENT_ASSERTION_TYPE_JWT));
+            parameters.add(new BasicNameValuePair(OAuth2Constants.CLIENT_ASSERTION,
+                createSignedRequestToken(privateKey, publicKey, Algorithm.PS256, null, assertion, null)));
+
+            try (CloseableHttpResponse resp = sendRequest(oauth.getServiceAccountUrl(), parameters)) {
+                OAuthClient.AccessTokenResponse response = new OAuthClient.AccessTokenResponse(resp);
+                assertNotNull(response.getAccessToken());
+            }
+        } finally {
+            revertJwksUriSettings(clientRepresentation, clientResource);
+        }
+    }
+
+    protected OAuthClient.AccessTokenResponse testMissingClaim(String... claims) throws Exception {
+        return testMissingClaim(0, claims);
+    }
+
+    protected OAuthClient.AccessTokenResponse testMissingClaim(int tokenTimeOffset, String... claims) throws Exception {
+        CustomJWTClientCredentialsProvider jwtProvider = new CustomJWTClientCredentialsProvider();
+        jwtProvider.setupKeyPair(keyPairClient1);
+        jwtProvider.setTokenTimeout(10);
+
+        for (String claim : claims) {
+            jwtProvider.enableClaim(claim, false);
+        }
+
+        Time.setOffset(tokenTimeOffset);
+        String jwt;
+        try {
+            jwt = jwtProvider.createSignedRequestToken(app1.getClientId(), getRealmInfoUrl());
+        } finally {
+            Time.setOffset(0);
+        }
+        return doClientCredentialsGrantRequest(jwt);
+    }
+
+    protected void assertError(OAuthClient.AccessTokenResponse response, String clientId, String responseError, String eventError) {
+        assertEquals(400, response.getStatusCode());
+        assertMessageError(response,clientId,responseError,eventError);
+    }
+
+    protected void assertError(OAuthClient.AccessTokenResponse response, int erroCode, String clientId, String responseError, String eventError) {
+        assertEquals(erroCode, response.getStatusCode());
+        assertMessageError(response, clientId, responseError, eventError);
+    }
+
+    protected void assertMessageError(OAuthClient.AccessTokenResponse response, String clientId, String responseError, String eventError) {
+        assertEquals(responseError, response.getError());
+
+        events.expectClientLogin()
+                .client(clientId)
+                .session((String) null)
+                .clearDetails()
+                .error(eventError)
+                .user((String) null)
+                .assertEvent();
+    }
+
+    protected void assertSuccess(OAuthClient.AccessTokenResponse response, String clientId, String userId, String userName) {
+        assertEquals(200, response.getStatusCode());
+
+        AccessToken accessToken = oauth.verifyToken(response.getAccessToken());
+        RefreshToken refreshToken = oauth.parseRefreshToken(response.getRefreshToken());
+
+        events.expectClientLogin()
+                .client(clientId)
+                .user(userId)
+                .session(accessToken.getSessionState())
+                .detail(Details.TOKEN_ID, accessToken.getId())
+                .detail(Details.REFRESH_TOKEN_ID, refreshToken.getId())
+                .detail(Details.USERNAME, userName)
+                .detail(Details.CLIENT_AUTH_METHOD, JWTClientAuthenticator.PROVIDER_ID)
+                .assertEvent();
+    }
+
+    protected static void assertCertificate(ClientRepresentation client, String certOld, String pem) {
+        pem = PemUtils.removeBeginEnd(pem);
+        final String certNew = client.getAttributes().get(JWTClientAuthenticator.CERTIFICATE_ATTR);
+        assertNotEquals("The old and new certificates shouldn't match", certOld, certNew);
+        assertEquals("Certificates don't match", pem, certNew);
+    }
+
+    protected void testCodeToTokenRequestFailure(String algorithm, String error, String description) throws Exception {
+        ClientRepresentation clientRepresentation = app2;
+        ClientResource clientResource = getClient(testRealm.getRealm(), clientRepresentation.getId());
+        clientRepresentation = clientResource.toRepresentation();
+        try {
+            // setup Jwks
+            KeyPair keyPair = setupJwksUrl(algorithm, clientRepresentation, clientResource);
+            PublicKey publicKey = keyPair.getPublic();
+            PrivateKey privateKey = keyPair.getPrivate();
+
+            // test
+            oauth.clientId("client2");
+            oauth.doLogin("test-user@localhost", "password");
+            EventRepresentation loginEvent = events.expectLogin()
+                    .client("client2")
+                    .assertEvent();
+
+            String code = oauth.getCurrentQuery().get(OAuth2Constants.CODE);
+            OAuthClient.AccessTokenResponse response = doAccessTokenRequest(code, getClient2SignedJWT());
+
+            assertEquals(400, response.getStatusCode());
+            assertEquals(error, response.getError());
+
+            events.expect(EventType.CODE_TO_TOKEN_ERROR)
+                    .client("client2")
+                    .session((String) null)
+                    .clearDetails()
+                    .error(description)
+                    .user((String) null)
+                    .assertEvent();
+        } finally {
+            // Revert jwks_url settings
+            revertJwksUriSettings(clientRepresentation, clientResource);
+        }
+    }
+
+    protected void testDirectGrantRequestFailure(String algorithm) throws Exception {
+        ClientRepresentation clientRepresentation = app2;
+        ClientResource clientResource = getClient(testRealm.getRealm(), clientRepresentation.getId());
+        clientRepresentation = clientResource.toRepresentation();
+        try {
+            // setup Jwks
+            setupJwksUrl(algorithm, clientRepresentation, clientResource);
+
+            // test
+            oauth.clientId("client2");
+            OAuthClient.AccessTokenResponse response = doGrantAccessTokenRequest("test-user@localhost", "password", getClient2SignedJWT());
+
+            assertEquals(400, response.getStatusCode());
+            assertEquals(OAuthErrorException.INVALID_CLIENT, response.getError());
+
+            events.expect(EventType.LOGIN_ERROR)
+                    .client("client2")
+                    .session((String) null)
+                    .clearDetails()
+                    .error("client_credentials_setup_required")
+                    .user((String) null)
+                    .assertEvent();
+        } finally {
+            // Revert jwks_url settings
+            revertJwksUriSettings(clientRepresentation, clientResource);
+        }
+    }
+
+    // HELPER METHODS
+
+    protected OAuthClient.AccessTokenResponse doAccessTokenRequest(String code, String signedJwt) throws Exception {
+        List<NameValuePair> parameters = new LinkedList<>();
+        parameters.add(new BasicNameValuePair(OAuth2Constants.GRANT_TYPE, OAuth2Constants.AUTHORIZATION_CODE));
+        parameters.add(new BasicNameValuePair(OAuth2Constants.CODE, code));
+        parameters.add(new BasicNameValuePair(OAuth2Constants.REDIRECT_URI, oauth.getRedirectUri()));
+        parameters.add(new BasicNameValuePair(OAuth2Constants.CLIENT_ASSERTION_TYPE, OAuth2Constants.CLIENT_ASSERTION_TYPE_JWT));
+        parameters.add(new BasicNameValuePair(OAuth2Constants.CLIENT_ASSERTION, signedJwt));
+
+        CloseableHttpResponse response = sendRequest(oauth.getAccessTokenUrl(), parameters);
+        return new OAuthClient.AccessTokenResponse(response);
+    }
+
+    protected OAuthClient.AccessTokenResponse doRefreshTokenRequest(String refreshToken, String signedJwt) throws Exception {
+        List<NameValuePair> parameters = new LinkedList<NameValuePair>();
+        parameters.add(new BasicNameValuePair(OAuth2Constants.GRANT_TYPE, OAuth2Constants.REFRESH_TOKEN));
+        parameters.add(new BasicNameValuePair(OAuth2Constants.REFRESH_TOKEN, refreshToken));
+        parameters.add(new BasicNameValuePair(OAuth2Constants.CLIENT_ASSERTION_TYPE, OAuth2Constants.CLIENT_ASSERTION_TYPE_JWT));
+        parameters.add(new BasicNameValuePair(OAuth2Constants.CLIENT_ASSERTION, signedJwt));
+
+        CloseableHttpResponse response = sendRequest(oauth.getRefreshTokenUrl(), parameters);
+        return new OAuthClient.AccessTokenResponse(response);
+    }
+
+    protected HttpResponse doLogout(String refreshToken, String signedJwt) throws Exception {
+        List<NameValuePair> parameters = new LinkedList<NameValuePair>();
+        parameters.add(new BasicNameValuePair(OAuth2Constants.GRANT_TYPE, OAuth2Constants.REFRESH_TOKEN));
+        parameters.add(new BasicNameValuePair(OAuth2Constants.REFRESH_TOKEN, refreshToken));
+        parameters.add(new BasicNameValuePair(OAuth2Constants.CLIENT_ASSERTION_TYPE, OAuth2Constants.CLIENT_ASSERTION_TYPE_JWT));
+        parameters.add(new BasicNameValuePair(OAuth2Constants.CLIENT_ASSERTION, signedJwt));
+
+        return sendRequest(oauth.getLogoutUrl().build(), parameters);
+    }
+
+    protected OAuthClient.AccessTokenResponse doClientCredentialsGrantRequest(String signedJwt) throws Exception {
+        List<NameValuePair> parameters = new LinkedList<NameValuePair>();
+        parameters.add(new BasicNameValuePair(OAuth2Constants.GRANT_TYPE, OAuth2Constants.CLIENT_CREDENTIALS));
+        parameters.add(new BasicNameValuePair(OAuth2Constants.CLIENT_ASSERTION_TYPE, OAuth2Constants.CLIENT_ASSERTION_TYPE_JWT));
+        parameters.add(new BasicNameValuePair(OAuth2Constants.CLIENT_ASSERTION, signedJwt));
+
+        CloseableHttpResponse response = sendRequest(oauth.getServiceAccountUrl(), parameters);
+        return new OAuthClient.AccessTokenResponse(response);
+    }
+
+    protected OAuthClient.AccessTokenResponse doGrantAccessTokenRequest(String username, String password, String signedJwt) throws Exception {
+        List<NameValuePair> parameters = new LinkedList<NameValuePair>();
+        parameters.add(new BasicNameValuePair(OAuth2Constants.GRANT_TYPE, OAuth2Constants.PASSWORD));
+        parameters.add(new BasicNameValuePair("username", username));
+        parameters.add(new BasicNameValuePair("password", password));
+        parameters.add(new BasicNameValuePair(OAuth2Constants.CLIENT_ASSERTION_TYPE, OAuth2Constants.CLIENT_ASSERTION_TYPE_JWT));
+        parameters.add(new BasicNameValuePair(OAuth2Constants.CLIENT_ASSERTION, signedJwt));
+
+        CloseableHttpResponse response = sendRequest(oauth.getResourceOwnerPasswordCredentialGrantUrl(), parameters);
+        return new OAuthClient.AccessTokenResponse(response);
+    }
+
+    protected CloseableHttpResponse sendRequest(String requestUrl, List<NameValuePair> parameters) throws Exception {
+        CloseableHttpClient client = new DefaultHttpClient();
+        try {
+            HttpPost post = new HttpPost(requestUrl);
+            UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters, "UTF-8");
+            post.setEntity(formEntity);
+            return client.execute(post);
+        } finally {
+            oauth.closeClient(client);
+        }
+    }
+
+    protected String getClient2SignedJWT(String algorithm) {
+        return getClientSignedJWT(getClient2KeyPair(), "client2", algorithm);
+    }
+
+    protected String getClient1SignedJWT() throws Exception {
+        return getClientSignedJWT(keyPairClient1, "client1", Algorithm.RS256);
+    }
+
+    protected String getClient2SignedJWT() {
+        return getClientSignedJWT(getClient2KeyPair(), "client2", Algorithm.RS256);
+    }
+
+    protected KeyPair getClient2KeyPair() {
+        return KeystoreUtil.loadKeyPairFromKeystore("classpath:client-auth-test/keystore-client2.jks",
+                "storepass", "keypass", "clientkey", KeystoreUtil.KeystoreFormat.JKS);
+    }
+
+    protected String getClientSignedJWT(KeyPair keyPair, String clientId) {
+        return getClientSignedJWT(keyPair, clientId, Algorithm.RS256);
+    }
+
+    private String getClientSignedJWT(KeyPair keyPair, String clientId, String algorithm) {
+        JWTClientCredentialsProvider jwtProvider = new JWTClientCredentialsProvider();
+        jwtProvider.setupKeyPair(keyPair, algorithm);
+        jwtProvider.setTokenTimeout(10);
+        return jwtProvider.createSignedRequestToken(clientId, getRealmInfoUrl());
+    }
+
+    protected String getRealmInfoUrl() {
+        String authServerBaseUrl = UriUtils.getOrigin(oauth.getRedirectUri()) + "/auth";
+        return KeycloakUriBuilder.fromUri(authServerBaseUrl).path(ServiceUrlConstants.REALM_INFO_PATH).build("test").toString();
+    }
+
+    protected ClientAttributeCertificateResource getClientAttributeCertificateResource(String realm, String clientId) {
+        return getClient(realm, clientId).getCertficateResource("jwt.credential");
+    }
+
+    protected ClientResource getClient(String realm, String clientId) {
+        return realmsResouce().realm(realm).clients().get(clientId);
+    }
+
+    /**
+     * Custom JWTClientCredentialsProvider with support for missing JWT claims
+     */
+    protected class CustomJWTClientCredentialsProvider extends JWTClientCredentialsProvider {
+        private Map<String, Boolean> enabledClaims = new HashMap<>();
+
+        public CustomJWTClientCredentialsProvider() {
+            super();
+
+            final String[] claims = {"id", "issuer", "subject", "audience", "expiration", "notBefore", "issuedAt"};
+            for (String claim : claims) {
+                enabledClaims.put(claim, true);
+            }
+        }
+
+        public void enableClaim(String claim, boolean value) {
+            if (!enabledClaims.containsKey(claim)) {
+                throw new IllegalArgumentException("Claim \"" + claim + "\" doesn't exist");
+            }
+            enabledClaims.put(claim, value);
+        }
+
+        public boolean isClaimEnabled(String claim) {
+            Boolean value = enabledClaims.get(claim);
+            if (value == null) {
+                throw new IllegalArgumentException("Claim \"" + claim + "\" doesn't exist");
+            }
+            return value;
+        }
+
+        public Set<String> getClaims() {
+            return enabledClaims.keySet();
+        }
+
+        @Override
+        protected JsonWebToken createRequestToken(String clientId, String realmInfoUrl) {
+            JsonWebToken reqToken = new JsonWebToken();
+            if (isClaimEnabled("id")) reqToken.id(AdapterUtils.generateId());
+            if (isClaimEnabled("issuer")) reqToken.issuer(clientId);
+            if (isClaimEnabled("subject")) reqToken.subject(clientId);
+            if (isClaimEnabled("audience")) reqToken.audience(realmInfoUrl);
+
+            int now = Time.currentTime();
+            if (isClaimEnabled("issuedAt")) reqToken.issuedAt(now);
+            if (isClaimEnabled("expiration")) reqToken.expiration(now + getTokenTimeout());
+            if (isClaimEnabled("notBefore")) reqToken.notBefore(now);
+
+            return reqToken;
+        }
+    }
+
+    private static KeyStore getKeystore(InputStream is, String storePassword, String format) throws Exception {
+        KeyStore keyStore = CryptoIntegration.getProvider().getKeyStore(KeystoreFormat.valueOf(format));
+        keyStore.load(is, storePassword.toCharArray());
+        return keyStore;
+    }
+
+    protected KeyPair setupJwksUrl(String algorithm, ClientRepresentation clientRepresentation, ClientResource clientResource) throws Exception {
+        return setupJwksUrl(algorithm, null, true, false, null, clientRepresentation, clientResource);
+    }
+
+    protected KeyPair setupJwksUrl(String algorithm, boolean advertiseJWKAlgorithm, boolean keepExistingKeys, String kid,
+                                 ClientRepresentation clientRepresentation, ClientResource clientResource) throws Exception {
+        return setupJwksUrl(algorithm, null, advertiseJWKAlgorithm, keepExistingKeys, kid, clientRepresentation, clientResource);
+    }
+
+    protected KeyPair setupJwksUrl(String algorithm, String curve, boolean advertiseJWKAlgorithm, boolean keepExistingKeys, String kid,
+                                 ClientRepresentation clientRepresentation, ClientResource clientResource) throws Exception {
+        // generate and register client keypair
+        TestOIDCEndpointsApplicationResource oidcClientEndpointsResource = testingClient.testApp().oidcClientEndpoints();
+        oidcClientEndpointsResource.generateKeys(algorithm, curve, advertiseJWKAlgorithm, keepExistingKeys, kid);
+        Map<String, String> generatedKeys = oidcClientEndpointsResource.getKeysAsBase64();
+        KeyPair keyPair = getKeyPairFromGeneratedBase64(generatedKeys, algorithm, curve);
+
+        // use and set jwks_url
+        OIDCAdvancedConfigWrapper.fromClientRepresentation(clientRepresentation).setUseJwksUrl(true);
+        String jwksUrl = TestApplicationResourceUrls.clientJwksUri();
+        OIDCAdvancedConfigWrapper.fromClientRepresentation(clientRepresentation).setJwksUrl(jwksUrl);
+        clientResource.update(clientRepresentation);
+
+        // set time offset, so that new keys are downloaded
+        setTimeOffset(20);
+
+        return keyPair;
+    }
+
+    private KeyPair setupJwks(String algorithm, String curve, ClientRepresentation clientRepresentation, ClientResource clientResource)
+        throws Exception {
+        // generate and register client keypair
+        TestOIDCEndpointsApplicationResource oidcClientEndpointsResource = testingClient.testApp().oidcClientEndpoints();
+        oidcClientEndpointsResource.generateKeys(algorithm, curve);
+        Map<String, String> generatedKeys = oidcClientEndpointsResource.getKeysAsBase64();
+        KeyPair keyPair = getKeyPairFromGeneratedBase64(generatedKeys, algorithm, curve);
+
+        // use and set JWKS
+        OIDCAdvancedConfigWrapper.fromClientRepresentation(clientRepresentation).setUseJwksString(true);
+        JSONWebKeySet keySet = oidcClientEndpointsResource.getJwks();
+        OIDCAdvancedConfigWrapper.fromClientRepresentation(clientRepresentation)
+            .setJwksString(JsonSerialization.writeValueAsString(keySet));
+        clientResource.update(clientRepresentation);
+
+        // set time offset, so that new keys are downloaded
+        setTimeOffset(20);
+
+        return keyPair;
+    }
+
+    protected void revertJwksUriSettings(ClientRepresentation clientRepresentation, ClientResource clientResource) {
+        OIDCAdvancedConfigWrapper.fromClientRepresentation(clientRepresentation).setUseJwksUrl(false);
+        OIDCAdvancedConfigWrapper.fromClientRepresentation(clientRepresentation).setJwksUrl(null);
+        clientResource.update(clientRepresentation);
+    }
+
+    private void revertJwksSettings(ClientRepresentation clientRepresentation, ClientResource clientResource) {
+        OIDCAdvancedConfigWrapper.fromClientRepresentation(clientRepresentation).setUseJwksString(false);
+        OIDCAdvancedConfigWrapper.fromClientRepresentation(clientRepresentation).setJwksString(null);
+        clientResource.update(clientRepresentation);
+    }
+
+    private KeyPair getKeyPairFromGeneratedBase64(Map<String, String> generatedKeys, String algorithm, String curve) throws Exception {
+        // It seems that PemUtils.decodePrivateKey, decodePublicKey can only treat RSA type keys, not EC type keys. Therefore, these are not used.
+        String privateKeyBase64 = generatedKeys.get(TestingOIDCEndpointsApplicationResource.PRIVATE_KEY);
+        String publicKeyBase64 =  generatedKeys.get(TestingOIDCEndpointsApplicationResource.PUBLIC_KEY);
+        PrivateKey privateKey = decodePrivateKey(Base64.decode(privateKeyBase64), algorithm, curve);
+        PublicKey publicKey = decodePublicKey(Base64.decode(publicKeyBase64), algorithm, curve);
+        return new KeyPair(publicKey, privateKey);
+    }
+
+    private PrivateKey decodePrivateKey(byte[] der, String algorithm, String curve) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchProviderException {
+        PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(der);
+        String keyAlg = getKeyAlgorithmFromJwaAlgorithm(algorithm, curve);
+        KeyFactory kf = CryptoIntegration.getProvider().getKeyFactory(keyAlg);
+        return kf.generatePrivate(spec);
+    }
+
+    private PublicKey decodePublicKey(byte[] der, String algorithm, String curve) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchProviderException {
+        X509EncodedKeySpec spec = new X509EncodedKeySpec(der);
+        String keyAlg = getKeyAlgorithmFromJwaAlgorithm(algorithm, curve);
+        KeyFactory kf = CryptoIntegration.getProvider().getKeyFactory(keyAlg);
+        return kf.generatePublic(spec);
+    }
+
+    protected String createSignedRequestToken(String clientId, String realmInfoUrl, PrivateKey privateKey, PublicKey publicKey, String algorithm) {
+        return createSignedRequestToken(privateKey, publicKey, algorithm, null, createRequestToken(clientId, realmInfoUrl), null);
+    }
+
+    protected String createSignedRequestToken(String clientId, String realmInfoUrl, PrivateKey privateKey, PublicKey publicKey, String algorithm, String curve) {
+        return createSignedRequestToken(privateKey, publicKey, algorithm, null, createRequestToken(clientId, realmInfoUrl), curve);
+    }
+
+    protected String createSignledRequestToken(PrivateKey privateKey, PublicKey publicKey, String algorithm, String kid, JsonWebToken jwt) {
+        return createSignedRequestToken(privateKey, publicKey, algorithm, kid, jwt, null);
+    }
+
+    protected String createSignedRequestToken(PrivateKey privateKey, PublicKey publicKey, String algorithm, String kid, JsonWebToken jwt, String curve) {
+        if (kid == null) {
+            kid = KeyUtils.createKeyId(publicKey);
+        }
+        SignatureSignerContext signer = oauth.createSigner(privateKey, kid, algorithm, curve);
+        String ret = new JWSBuilder().kid(kid).jsonContent(jwt).sign(signer);
+        return ret;
+    }
+
+    protected JsonWebToken createRequestToken(String clientId, String realmInfoUrl) {
+        JsonWebToken reqToken = new JsonWebToken();
+        reqToken.id(AdapterUtils.generateId());
+        reqToken.issuer(clientId);
+        reqToken.subject(clientId);
+        reqToken.audience(realmInfoUrl);
+
+        int now = Time.currentTime();
+        reqToken.issuedAt(now);
+        reqToken.expiration(now + 10);
+        reqToken.notBefore(now);
+
+        return reqToken;
+    }
+
+    protected String getKeyAlgorithmFromJwaAlgorithm(String jwaAlgorithm, String curve) {
+        String keyAlg = null;
+        switch (jwaAlgorithm) {
+            case Algorithm.RS256:
+            case Algorithm.RS384:
+            case Algorithm.RS512:
+            case Algorithm.PS256:
+            case Algorithm.PS384:
+            case Algorithm.PS512:
+                keyAlg = KeyType.RSA;
+                break;
+            case Algorithm.ES256:
+            case Algorithm.ES384:
+            case Algorithm.ES512:
+                keyAlg = KeyType.EC;
+                break;
+            default :
+                throw new RuntimeException("Unsupported signature algorithm");
+        }
+        return keyAlg;
+    }
+}

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/oauth/AccessTokenTest.java

@@ -1310,6 +1310,16 @@ public class AccessTokenTest extends AbstractKeycloakTest {
         conductAccessTokenRequest(Algorithm.HS256, Algorithm.ES512, Algorithm.RS256);
     }
 
+    @Test
+    public void accessTokenRequest_ClientEdDSA_RealmES256() throws Exception {
+        conductAccessTokenRequest(Algorithm.HS256, Algorithm.EdDSA, Algorithm.ES256);
+    }
+
+    @Test
+    public void accessTokenRequest_ClientEdDSA_RealmEdDSA() throws Exception {
+        conductAccessTokenRequest(Algorithm.HS256, Algorithm.EdDSA, Algorithm.EdDSA);
+    }
+    
     @Test
     public void validateECDSASignatures() {
         validateTokenECDSASignature(Algorithm.ES256);
@@ -1354,7 +1364,6 @@ public class AccessTokenTest extends AbstractKeycloakTest {
             TokenSignatureUtil.changeRealmTokenSignatureProvider(adminClient, Algorithm.RS256);
             TokenSignatureUtil.changeClientAccessTokenSignatureProvider(ApiUtil.findClientByClientId(adminClient.realm("test"), "test-app"), Algorithm.RS256);
         }
-        return;
     }
 
     private void tokenRequest(String expectedRefreshAlg, String expectedAccessAlg, String expectedIdTokenAlg) throws Exception {
@@ -1373,17 +1382,17 @@ public class AccessTokenTest extends AbstractKeycloakTest {
         assertEquals("Bearer", response.getTokenType());
 
         JWSHeader header = new JWSInput(response.getAccessToken()).getHeader();
-        assertEquals(expectedAccessAlg, header.getAlgorithm().name());
+        verifySignatureAlgorithm(header, expectedAccessAlg);
         assertEquals("JWT", header.getType());
         assertNull(header.getContentType());
 
         header = new JWSInput(response.getIdToken()).getHeader();
-        assertEquals(expectedIdTokenAlg, header.getAlgorithm().name());
+        verifySignatureAlgorithm(header, expectedIdTokenAlg);
         assertEquals("JWT", header.getType());
         assertNull(header.getContentType());
 
         header = new JWSInput(response.getRefreshToken()).getHeader();
-        assertEquals(expectedRefreshAlg, header.getAlgorithm().name());
+        verifySignatureAlgorithm(header, expectedRefreshAlg);
         assertEquals("JWT", header.getType());
         assertNull(header.getContentType());
 
@@ -1401,6 +1410,10 @@ public class AccessTokenTest extends AbstractKeycloakTest {
         assertEquals(sessionId, token.getSessionState());
     }
 
+    private void verifySignatureAlgorithm(JWSHeader header, String expectedAlgorithm) {
+        assertEquals(expectedAlgorithm, header.getAlgorithm().name());
+    }
+
     // KEYCLOAK-16009
     @Test
     public void tokenRequestParamsMoreThanOnce() throws Exception {

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/oauth/ClientAuthEdDSASignedJWTTest.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2023 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.keycloak.testsuite.oauth;
+
+import org.junit.Test;
+import org.keycloak.crypto.Algorithm;
+
+/**
+ * @author <a href="mailto:takashi.norimatsu.ws@hitachi.com">Takashi Norimatsu</a>
+ */
+public class ClientAuthEdDSASignedJWTTest extends AbstractClientAuthSignedJWTTest {
+
+    @Test
+    public void testCodeToTokenRequestSuccessEd448usingJwksUri() throws Exception {
+        testCodeToTokenRequestSuccess(Algorithm.EdDSA, Algorithm.Ed448, true);
+    }
+
+    @Test
+    public void testCodeToTokenRequestSuccessEd25519usingJwks() throws Exception {
+        testCodeToTokenRequestSuccess(Algorithm.EdDSA, Algorithm.Ed25519, false);
+    }
+
+    @Override
+    protected String getKeyAlgorithmFromJwaAlgorithm(String jwaAlgorithm, String curve) {
+        if (!Algorithm.EdDSA.equals(jwaAlgorithm)) {
+            throw new RuntimeException("Unsupported signature algorithm: " + jwaAlgorithm);
+        }
+        switch (curve) {
+            case Algorithm.Ed25519:
+                return Algorithm.Ed25519;
+            case Algorithm.Ed448:
+                return Algorithm.Ed448;
+            default :
+                throw new RuntimeException("Unsupported signature curve " + curve);
+        }
+    }
+}

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/oidc/AuthorizationTokenEncryptionTest.java

@@ -101,7 +101,7 @@ public class AuthorizationTokenEncryptionTest extends AbstractTestRealmKeycloakT
 
     @Test
     public void testAuthorizationEncryptionAlgRSA1_5EncA192GCM() {
-        testAuthorizationTokenSignatureAndEncryption(Algorithm.RS512, JWEConstants.RSA1_5, JWEConstants.A192GCM);
+        testAuthorizationTokenSignatureAndEncryption(Algorithm.EdDSA, JWEConstants.RSA1_5, JWEConstants.A192GCM);
     }
 
     @Test
@@ -123,7 +123,7 @@ public class AuthorizationTokenEncryptionTest extends AbstractTestRealmKeycloakT
 
     @Test
     public void testAuthorizationEncryptionAlgRSA_OAEPEncA256CBC_HS512() {
-        testAuthorizationTokenSignatureAndEncryption(Algorithm.PS512, JWEConstants.RSA_OAEP, JWEConstants.A256CBC_HS512);
+        testAuthorizationTokenSignatureAndEncryption(Algorithm.EdDSA, JWEConstants.RSA_OAEP, JWEConstants.A256CBC_HS512);
     }
 
     @Test

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/oidc/OIDCAdvancedRequestParamsTest.java

@@ -997,6 +997,10 @@ public class OIDCAdvancedRequestParamsTest extends AbstractTestRealmKeycloakTest
     }
 
     private void requestUriParamSignedIn(String expectedAlgorithm, String actualAlgorithm) {
+        requestUriParamSignedIn(expectedAlgorithm, actualAlgorithm, null);
+    }
+
+    private void requestUriParamSignedIn(String expectedAlgorithm, String actualAlgorithm, String curve) {
         ClientResource clientResource = null;
         ClientRepresentation clientRep = null;
         try {
@@ -1010,7 +1014,7 @@ public class OIDCAdvancedRequestParamsTest extends AbstractTestRealmKeycloakTest
             clientResource.update(clientRep);
 
             // generate and register client keypair
-            if ("none" != actualAlgorithm) oidcClientEndpointsResource.generateKeys(actualAlgorithm);
+            if (!"none".equals(actualAlgorithm)) oidcClientEndpointsResource.generateKeys(actualAlgorithm, curve);
 
             // register request object
             oidcClientEndpointsResource.setOIDCRequest("test", "test-app", validRedirectUri, "10", "mystate3", actualAlgorithm);
@@ -1119,7 +1123,19 @@ public class OIDCAdvancedRequestParamsTest extends AbstractTestRealmKeycloakTest
     }
 
     @Test
-    public void requestUriParamSignedExpectedAnyActualES256() {
+    public void requestUriParamSignedExpectedEd25519ActualEd25519() throws Exception {
+        // will success
+        requestUriParamSignedIn(Algorithm.EdDSA, Algorithm.EdDSA, Algorithm.Ed25519);
+    }
+
+    @Test
+    public void requestUriParamSignedExpectedES256ActualEd448() throws Exception {
+        // will fail
+        requestUriParamSignedIn(Algorithm.ES256, Algorithm.EdDSA, Algorithm.Ed448);
+    }
+
+    @Test
+    public void requestUriParamSignedExpectedAnyActualES256() throws Exception {
         // Algorithm is null if 'any'
         // will success
         requestUriParamSignedIn(null, Algorithm.ES256);

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/oidc/OIDCWellKnownProviderTest.java

@@ -142,10 +142,10 @@ public class OIDCWellKnownProviderTest extends AbstractKeycloakTest {
             Assert.assertNames(oidcConfig.getSubjectTypesSupported(), "pairwise", "public");
 
             // Signature algorithms
-            Assert.assertNames(oidcConfig.getIdTokenSigningAlgValuesSupported(), Algorithm.PS256, Algorithm.PS384, Algorithm.PS512, Algorithm.RS256, Algorithm.RS384, Algorithm.RS512, Algorithm.ES256, Algorithm.ES384, Algorithm.ES512, Algorithm.HS256, Algorithm.HS384, Algorithm.HS512);
+            Assert.assertNames(oidcConfig.getIdTokenSigningAlgValuesSupported(), Algorithm.PS256, Algorithm.PS384, Algorithm.PS512, Algorithm.RS256, Algorithm.RS384, Algorithm.RS512, Algorithm.ES256, Algorithm.ES384, Algorithm.ES512, Algorithm.HS256, Algorithm.HS384, Algorithm.HS512, Algorithm.EdDSA);
-            Assert.assertNames(oidcConfig.getUserInfoSigningAlgValuesSupported(), "none", Algorithm.PS256, Algorithm.PS384, Algorithm.PS512, Algorithm.RS256, Algorithm.RS384, Algorithm.RS512, Algorithm.ES256, Algorithm.ES384, Algorithm.ES512, Algorithm.HS256, Algorithm.HS384, Algorithm.HS512);
+            Assert.assertNames(oidcConfig.getUserInfoSigningAlgValuesSupported(), "none", Algorithm.PS256, Algorithm.PS384, Algorithm.PS512, Algorithm.RS256, Algorithm.RS384, Algorithm.RS512, Algorithm.ES256, Algorithm.ES384, Algorithm.ES512, Algorithm.HS256, Algorithm.HS384, Algorithm.HS512, Algorithm.EdDSA);
-            Assert.assertNames(oidcConfig.getRequestObjectSigningAlgValuesSupported(), "none", Algorithm.PS256, Algorithm.PS384, Algorithm.PS512, Algorithm.RS256, Algorithm.RS384, Algorithm.RS512, Algorithm.ES256, Algorithm.ES384, Algorithm.ES512, Algorithm.HS256, Algorithm.HS384, Algorithm.HS512);
+            Assert.assertNames(oidcConfig.getRequestObjectSigningAlgValuesSupported(), "none", Algorithm.PS256, Algorithm.PS384, Algorithm.PS512, Algorithm.RS256, Algorithm.RS384, Algorithm.RS512, Algorithm.ES256, Algorithm.ES384, Algorithm.ES512, Algorithm.HS256, Algorithm.HS384, Algorithm.HS512, Algorithm.EdDSA);
-            Assert.assertNames(oidcConfig.getAuthorizationSigningAlgValuesSupported(), Algorithm.PS256, Algorithm.PS384, Algorithm.PS512, Algorithm.RS256, Algorithm.RS384, Algorithm.RS512, Algorithm.ES256, Algorithm.ES384, Algorithm.ES512, Algorithm.HS256, Algorithm.HS384, Algorithm.HS512);
+            Assert.assertNames(oidcConfig.getAuthorizationSigningAlgValuesSupported(), Algorithm.PS256, Algorithm.PS384, Algorithm.PS512, Algorithm.RS256, Algorithm.RS384, Algorithm.RS512, Algorithm.ES256, Algorithm.ES384, Algorithm.ES512, Algorithm.HS256, Algorithm.HS384, Algorithm.HS512, Algorithm.EdDSA);
 
             // request object encryption algorithms
             Assert.assertNames(oidcConfig.getRequestObjectEncryptionAlgValuesSupported(), JWEConstants.RSA_OAEP, JWEConstants.RSA_OAEP_256, JWEConstants.RSA1_5);
@@ -161,12 +161,12 @@ public class OIDCWellKnownProviderTest extends AbstractKeycloakTest {
 
             // Client authentication
             Assert.assertNames(oidcConfig.getTokenEndpointAuthMethodsSupported(), "client_secret_basic", "client_secret_post", "private_key_jwt", "client_secret_jwt", "tls_client_auth");
-            Assert.assertNames(oidcConfig.getTokenEndpointAuthSigningAlgValuesSupported(), Algorithm.PS256, Algorithm.PS384, Algorithm.PS512, Algorithm.RS256, Algorithm.RS384, Algorithm.RS512, Algorithm.ES256, Algorithm.ES384, Algorithm.ES512, Algorithm.HS256, Algorithm.HS384, Algorithm.HS512);
+            Assert.assertNames(oidcConfig.getTokenEndpointAuthSigningAlgValuesSupported(), Algorithm.PS256, Algorithm.PS384, Algorithm.PS512, Algorithm.RS256, Algorithm.RS384, Algorithm.RS512, Algorithm.ES256, Algorithm.ES384, Algorithm.ES512, Algorithm.HS256, Algorithm.HS384, Algorithm.HS512, Algorithm.EdDSA);
             // NOTE: Those are overriden in "oidc-well-known-config-override.json" and they are tested in testDefaultProviderCustomizations
             //Assert.assertNames(oidcConfig.getIntrospectionEndpointAuthMethodsSupported(), "private_key_jwt", "client_secret_jwt", "tls_client_auth", "custom_nonexisting_authenticator");
             Assert.assertNames(oidcConfig.getIntrospectionEndpointAuthSigningAlgValuesSupported(), Algorithm.PS256,
                 Algorithm.PS384, Algorithm.PS512, Algorithm.RS256, Algorithm.RS384, Algorithm.RS512, Algorithm.ES256,
-                Algorithm.ES384, Algorithm.ES512, Algorithm.HS256, Algorithm.HS384, Algorithm.HS512);
+                Algorithm.ES384, Algorithm.ES512, Algorithm.HS256, Algorithm.HS384, Algorithm.HS512, Algorithm.EdDSA);
 
             // Claims
             assertContains(oidcConfig.getClaimsSupported(), IDToken.NAME, IDToken.EMAIL, IDToken.PREFERRED_USERNAME, IDToken.FAMILY_NAME, IDToken.ACR);
@@ -196,7 +196,7 @@ public class OIDCWellKnownProviderTest extends AbstractKeycloakTest {
             assertEquals(oidcConfig.getBackchannelAuthenticationEndpoint(), oauth.getBackchannelAuthenticationUrl());
             assertContains(oidcConfig.getGrantTypesSupported(), OAuth2Constants.CIBA_GRANT_TYPE);
             Assert.assertNames(oidcConfig.getBackchannelTokenDeliveryModesSupported(), "poll", "ping");
-            Assert.assertNames(oidcConfig.getBackchannelAuthenticationRequestSigningAlgValuesSupported(), Algorithm.PS256, Algorithm.PS384, Algorithm.PS512, Algorithm.RS256, Algorithm.RS384, Algorithm.RS512, Algorithm.ES256, Algorithm.ES384, Algorithm.ES512);
+            Assert.assertNames(oidcConfig.getBackchannelAuthenticationRequestSigningAlgValuesSupported(), Algorithm.PS256, Algorithm.PS384, Algorithm.PS512, Algorithm.RS256, Algorithm.RS384, Algorithm.RS512, Algorithm.ES256, Algorithm.ES384, Algorithm.ES512, Algorithm.EdDSA);
 
             Assert.assertTrue(oidcConfig.getBackchannelLogoutSupported());
             Assert.assertTrue(oidcConfig.getBackchannelLogoutSessionSupported());
@@ -207,7 +207,7 @@ public class OIDCWellKnownProviderTest extends AbstractKeycloakTest {
                 "client_secret_post", "private_key_jwt", "client_secret_jwt", "tls_client_auth");
             Assert.assertNames(oidcConfig.getRevocationEndpointAuthSigningAlgValuesSupported(), Algorithm.PS256,
                 Algorithm.PS384, Algorithm.PS512, Algorithm.RS256, Algorithm.RS384, Algorithm.RS512, Algorithm.ES256,
-                Algorithm.ES384, Algorithm.ES512, Algorithm.HS256, Algorithm.HS384, Algorithm.HS512);
+                Algorithm.ES384, Algorithm.ES512, Algorithm.HS256, Algorithm.HS384, Algorithm.HS512, Algorithm.EdDSA);
 
             assertEquals(oidcConfig.getDeviceAuthorizationEndpoint(), oauth.getDeviceAuthorizationUrl());
 

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/oidc/UserInfoTest.java

@@ -327,13 +327,27 @@ public class UserInfoTest extends AbstractKeycloakTest {
         testUserInfoSignatureAndEncryption(null, JWEConstants.RSA1_5, null);
     }
 
+    @Test
+    public void testSuccessEncryptedResponseSigAlgEd25519AlgRSA_OAEPEncA256GCM() throws Exception {
+        testUserInfoSignatureAndEncryption(Algorithm.EdDSA, Algorithm.Ed25519, JWEConstants.RSA_OAEP, JWEConstants.A256GCM);
+    }
+
+    @Test
+    public void testSuccessEncryptedResponseSigAlgEd448AlgRSA_OAEP256EncA256CBC_HS512() throws Exception {
+        testUserInfoSignatureAndEncryption(Algorithm.EdDSA, Algorithm.Ed448, JWEConstants.RSA_OAEP_256, JWEConstants.A256CBC_HS512);
+    }
+
     private void testUserInfoSignatureAndEncryption(String sigAlgorithm, String algAlgorithm, String encAlgorithm) {
+        testUserInfoSignatureAndEncryption(sigAlgorithm, null, algAlgorithm, encAlgorithm);
+    }
+
+    private void testUserInfoSignatureAndEncryption(String sigAlgorithm, String curve, String algAlgorithm, String encAlgorithm) {
         ClientResource clientResource = null;
         ClientRepresentation clientRep = null;
         try {
             // generate and register encryption key onto client
             TestOIDCEndpointsApplicationResource oidcClientEndpointsResource = testingClient.testApp().oidcClientEndpoints();
-            oidcClientEndpointsResource.generateKeys(algAlgorithm);
+            oidcClientEndpointsResource.generateKeys(algAlgorithm, curve);
 
             clientResource = ApiUtil.findClientByClientId(adminClient.realm("test"), "test-app");
             clientRep = clientResource.toRepresentation();

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/oidc/flows/AbstractOIDCResponseTypeTest.java

@@ -233,13 +233,13 @@ public abstract class AbstractOIDCResponseTypeTest extends AbstractTestRealmKeyc
         String accessToken = authzResponse.getAccessToken();
         if (idToken != null) {
             header = new JWSInput(idToken).getHeader();
-            assertEquals(expectedIdTokenAlg, header.getAlgorithm().name());
+            verifySignatureAlgorithm(header, expectedIdTokenAlg);
             assertEquals("JWT", header.getType());
             assertNull(header.getContentType());
         }
         if (accessToken != null) {
             header = new JWSInput(accessToken).getHeader();
-            assertEquals(expectedAccessAlg, header.getAlgorithm().name());
+            verifySignatureAlgorithm(header, expectedAccessAlg);
             assertEquals("JWT", header.getType());
             assertNull(header.getContentType());
         }
@@ -252,6 +252,10 @@ public abstract class AbstractOIDCResponseTypeTest extends AbstractTestRealmKeyc
         }
     }
 
+    private void verifySignatureAlgorithm(JWSHeader header, String expectedAlgorithm) {
+        assertEquals(expectedAlgorithm, header.getAlgorithm().name());
+    }
+
     @Test
     public void oidcFlow_RealmRS256_ClientRS384() throws Exception {
         oidcFlowRequest(Algorithm.RS256, Algorithm.RS384);
@@ -272,6 +276,16 @@ public abstract class AbstractOIDCResponseTypeTest extends AbstractTestRealmKeyc
         oidcFlowRequest(Algorithm.PS256, Algorithm.ES256);
     }
 
+    @Test
+    public void oidcFlow_RealmEdDSA_ClientES256() throws Exception {
+        oidcFlowRequest(Algorithm.EdDSA, Algorithm.ES256);
+    }
+
+    @Test
+    public void oidcFlow_RealmPS256_ClientEdDSA() throws Exception {
+        oidcFlowRequest(Algorithm.PS256, Algorithm.EdDSA);
+    }
+
     private void oidcFlowRequest(String expectedAccessAlg, String expectedIdTokenAlg) throws Exception {
         try {
             setIdTokenSignatureAlgorithm(expectedIdTokenAlg);

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/oidc/flows/OIDCBasicResponseTypeCodeTest.java

@@ -19,6 +19,7 @@ package org.keycloak.testsuite.oidc.flows;
 
 import org.junit.Before;
 import org.junit.Test;
+import org.keycloak.crypto.KeyWrapper;
 import org.keycloak.events.Details;
 import org.keycloak.protocol.oidc.utils.OIDCResponseType;
 import org.keycloak.representations.IDToken;