/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.cxf.rs.security.jose.jws;
import java.security.MessageDigest;
import java.security.spec.AlgorithmParameterSpec;
import java.util.logging.Logger;
import javax.crypto.Mac;
import org.apache.cxf.common.logging.LogUtils;
import org.apache.cxf.rs.security.jose.common.JoseUtils;
import org.apache.cxf.rs.security.jose.jwa.AlgorithmUtils;
import org.apache.cxf.rs.security.jose.jwa.SignatureAlgorithm;
import org.apache.cxf.rt.security.crypto.HmacUtils;
public class HmacJwsSignatureVerifier implements JwsSignatureVerifier {
protected static final Logger LOG = LogUtils.getL7dLogger(HmacJwsSignatureVerifier.class);
private byte[] key;
private AlgorithmParameterSpec hmacSpec;
private SignatureAlgorithm supportedAlgo;
public HmacJwsSignatureVerifier(String encodedKey) {
this(JoseUtils.decode(encodedKey), SignatureAlgorithm.HS256);
}
public HmacJwsSignatureVerifier(String encodedKey, SignatureAlgorithm supportedAlgo) {
this(JoseUtils.decode(encodedKey), supportedAlgo);
}
public HmacJwsSignatureVerifier(byte[] key, SignatureAlgorithm supportedAlgo) {
this(key, null, supportedAlgo);
}
public HmacJwsSignatureVerifier(byte[] key, AlgorithmParameterSpec spec, SignatureAlgorithm supportedAlgo) {
this.key = key;
this.hmacSpec = spec;
this.supportedAlgo = supportedAlgo;
}
@Override
public boolean verify(JwsHeaders headers, String unsignedText, byte[] signature) {
byte[] expected = computeMac(headers, unsignedText);
return MessageDigest.isEqual(expected, signature);
}
private byte[] computeMac(JwsHeaders headers, String text) {
final String sigAlgo = checkAlgorithm(headers.getSignatureAlgorithm());
return HmacUtils.computeHmac(key,
AlgorithmUtils.toJavaName(sigAlgo),
hmacSpec,
text);
}
protected String checkAlgorithm(SignatureAlgorithm sigAlgo) {
if (sigAlgo == null) {
LOG.warning("Signature algorithm is not set");
throw new JwsException(JwsException.Error.ALGORITHM_NOT_SET);
}
String algo = sigAlgo.getJwaName();
if (!AlgorithmUtils.isHmacSign(algo)
|| !algo.equals(supportedAlgo.getJwaName())) {
LOG.warning("Invalid signature algorithm: " + algo);
throw new JwsException(JwsException.Error.INVALID_ALGORITHM);
}
return algo;
}
@Override
public SignatureAlgorithm getAlgorithm() {
return supportedAlgo;
}
@Override
public JwsVerificationSignature createJwsVerificationSignature(JwsHeaders headers) {
final String sigAlgo = checkAlgorithm(headers.getSignatureAlgorithm());
Mac mac = HmacUtils.getInitializedMac(key,
AlgorithmUtils.toJavaName(sigAlgo),
hmacSpec);
return new HmacJwsVerificationSignature(mac);
}
private static class HmacJwsVerificationSignature implements JwsVerificationSignature {
private Mac mac;
HmacJwsVerificationSignature(Mac mac) {
this.mac = mac;
}
@Override
public void update(byte[] src, int off, int len) {
mac.update(src, off, len);
}
@Override
public boolean verify(byte[] signature) {
byte[] macBytes = mac.doFinal();
return MessageDigest.isEqual(macBytes, signature);
}
}
}