org.keycloak.jose.jws.crypto.HashUtils Maven / Gradle / Ivy
/*
* 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.jws.crypto;
import org.keycloak.common.util.Base64Url;
import org.keycloak.crypto.HashException;
import org.keycloak.crypto.JavaAlgorithm;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.util.Arrays;
/**
* @author Marek Posolda
*/
public class HashUtils {
// See:
// - "at_hash" and "c_hash" in OIDC specification (full = false)
// - "ath" in DPoP specification (full = true)
public static String accessTokenHash(String jwtAlgorithmName, String input, boolean full) {
return accessTokenHash(jwtAlgorithmName, null, input, full);
}
public static String accessTokenHash(String jwtAlgorithmName, String curve, String input, boolean full) {
byte[] inputBytes = input.getBytes(StandardCharsets.UTF_8);
String javaAlgName = JavaAlgorithm.getJavaAlgorithmForHash(jwtAlgorithmName, curve);
byte[] hash = hash(javaAlgName, inputBytes);
return encodeHashToOIDC(hash, full);
}
public static String accessTokenHash(String jwtAlgorithmName, String input) {
return HashUtils.accessTokenHash(jwtAlgorithmName, null, input, false);
}
public static String accessTokenHash(String jwtAlgorithmName, String curve, String input) {
return HashUtils.accessTokenHash(jwtAlgorithmName, curve, input, false);
}
public static byte[] hash(String javaAlgorithmName, byte[] inputBytes) {
try {
MessageDigest md = MessageDigest.getInstance(javaAlgorithmName);
md.update(inputBytes);
return md.digest();
} catch (Exception e) {
throw new HashException("Error when creating token hash", e);
}
}
public static String encodeHashToOIDC(byte[] hash) {
return encodeHashToOIDC(hash, false);
}
public static String encodeHashToOIDC(byte[] hash, boolean full) {
int hashLength = full ? hash.length : hash.length / 2;
byte[] hashInput = Arrays.copyOf(hash, hashLength);
return Base64Url.encode(hashInput);
}
}
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