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PicketLink JSON provides an API and implementation for JSON based on related specifications such as JWT, JWS and JWE.
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/*
* JBoss, Home of Professional Open Source.
* Copyright 2012, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.picketlink.json.jose.crypto;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
* Static methods for Hash-based Message Authentication Codes (HMAC).
*
* @author Giriraj Sharma
*/
public class HMAC {
/**
* Computes a Hash-based Message Authentication Code (HMAC) for the specified (shared) secret and message.
*
* @param alg The Java Cryptography Architecture (JCA) HMAC algorithm name. Must not be {@code null}.
* @param secret The (shared) secret. Must not be {@code null}.
* @param message The message. Must not be {@code null}.
*
* @return A MAC service instance.
*
* @throws RuntimeException If the algorithm is not supported or the MAC secret key is invalid.
*/
public static byte[] compute(final String alg,
final byte[] secret,
final byte[] message) {
return compute(new SecretKeySpec(secret, alg), message);
}
/**
* Computes a Hash-based Message Authentication Code (HMAC) for the specified (shared) secret key and message.
*
* @param secretKey The (shared) secret key, with the appropriate HMAC algorithm. Must not be {@code null}.
* @param message The message. Must not be {@code null}.
*
* @return A MAC service instance.
*
* @throws RuntimeException If the algorithm is not supported or the MAC secret key is invalid.
*/
public static byte[] compute(final SecretKey secretKey,
final byte[] message) {
Mac mac;
try {
mac = Mac.getInstance(secretKey.getAlgorithm());
mac.init(secretKey);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("Unsupported HMAC algorithm: " + e.getMessage(), e);
} catch (InvalidKeyException e) {
throw new RuntimeException("Invalid HMAC key: " + e.getMessage(), e);
}
mac.update(message);
return mac.doFinal();
}
}
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