/**
* 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.jwe;
import java.security.spec.AlgorithmParameterSpec;
import java.util.logging.Logger;
import javax.crypto.SecretKey;
import org.apache.cxf.common.logging.LogUtils;
import org.apache.cxf.common.util.Base64UrlUtility;
import org.apache.cxf.rs.security.jose.common.JoseException;
import org.apache.cxf.rs.security.jose.jwa.AlgorithmUtils;
import org.apache.cxf.rs.security.jose.jwa.KeyAlgorithm;
import org.apache.cxf.rt.security.crypto.CryptoUtils;
public class AesGcmWrapKeyDecryptionAlgorithm extends WrappedKeyDecryptionAlgorithm {
protected static final Logger LOG = LogUtils.getL7dLogger(AesGcmWrapKeyDecryptionAlgorithm.class);
public AesGcmWrapKeyDecryptionAlgorithm(String encodedKey) {
this(encodedKey, null);
}
public AesGcmWrapKeyDecryptionAlgorithm(String encodedKey, KeyAlgorithm supportedAlgo) {
this(CryptoUtils.decodeSequence(encodedKey), supportedAlgo);
}
public AesGcmWrapKeyDecryptionAlgorithm(byte[] secretKey) {
this(secretKey, KeyAlgorithm.A128GCMKW);
}
public AesGcmWrapKeyDecryptionAlgorithm(byte[] secretKey, KeyAlgorithm supportedAlgo) {
this(CryptoUtils.createSecretKeySpec(secretKey, AlgorithmUtils.AES), supportedAlgo);
}
public AesGcmWrapKeyDecryptionAlgorithm(SecretKey secretKey) {
this(secretKey, null);
}
public AesGcmWrapKeyDecryptionAlgorithm(SecretKey secretKey, KeyAlgorithm supportedAlgo) {
super(secretKey, supportedAlgo);
}
@Override
protected byte[] getEncryptedContentEncryptionKey(JweDecryptionInput jweDecryptionInput) {
byte[] encryptedCekKey = super.getEncryptedContentEncryptionKey(jweDecryptionInput);
byte[] tag = getDecodedBytes(jweDecryptionInput, "tag");
return JweCompactConsumer.getCipherWithAuthTag(encryptedCekKey, tag);
}
protected AlgorithmParameterSpec getAlgorithmParameterSpec(JweDecryptionInput jweDecryptionInput) {
byte[] iv = getDecodedBytes(jweDecryptionInput, "iv");
return CryptoUtils.getContentEncryptionCipherSpec(128, iv);
}
private byte[] getDecodedBytes(JweDecryptionInput jweDecryptionInput, String headerName) {
try {
Object ivHeader = jweDecryptionInput.getJweHeaders().getHeader(headerName);
return Base64UrlUtility.decode(ivHeader.toString());
} catch (Exception ex) {
throw new JoseException(ex);
}
}
protected void validateKeyEncryptionAlgorithm(String keyAlgo) {
super.validateKeyEncryptionAlgorithm(keyAlgo);
if (!AlgorithmUtils.isAesGcmKeyWrap(keyAlgo)) {
LOG.warning("Invalid key encryption algorithm");
throw new JweException(JweException.Error.INVALID_KEY_ALGORITHM);
}
}
}