/**
* 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.Key;
import java.security.spec.AlgorithmParameterSpec;
import java.util.logging.Logger;
import org.apache.cxf.common.logging.LogUtils;
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;
import org.apache.cxf.rt.security.crypto.KeyProperties;
public class WrappedKeyDecryptionAlgorithm implements KeyDecryptionProvider {
protected static final Logger LOG = LogUtils.getL7dLogger(WrappedKeyDecryptionAlgorithm.class);
private Key cekDecryptionKey;
private boolean unwrap;
private KeyAlgorithm supportedAlgo;
public WrappedKeyDecryptionAlgorithm(Key cekDecryptionKey, KeyAlgorithm supportedAlgo) {
this(cekDecryptionKey, supportedAlgo, true);
}
public WrappedKeyDecryptionAlgorithm(Key cekDecryptionKey, KeyAlgorithm supportedAlgo, boolean unwrap) {
this.cekDecryptionKey = cekDecryptionKey;
this.supportedAlgo = supportedAlgo;
this.unwrap = unwrap;
}
public byte[] getDecryptedContentEncryptionKey(JweDecryptionInput jweDecryptionInput) {
KeyProperties keyProps = new KeyProperties(getKeyEncryptionAlgorithm(jweDecryptionInput));
AlgorithmParameterSpec spec = getAlgorithmParameterSpec(jweDecryptionInput);
if (spec != null) {
keyProps.setAlgoSpec(spec);
}
if (!unwrap) {
keyProps.setBlockSize(getKeyCipherBlockSize());
return CryptoUtils.decryptBytes(getEncryptedContentEncryptionKey(jweDecryptionInput),
getCekDecryptionKey(), keyProps);
} else {
return CryptoUtils.unwrapSecretKey(getEncryptedContentEncryptionKey(jweDecryptionInput),
getContentEncryptionAlgorithm(jweDecryptionInput),
getCekDecryptionKey(),
keyProps).getEncoded();
}
}
protected Key getCekDecryptionKey() {
return cekDecryptionKey;
}
protected int getKeyCipherBlockSize() {
return -1;
}
protected String getKeyEncryptionAlgorithm(JweDecryptionInput jweDecryptionInput) {
String keyAlgo = jweDecryptionInput.getJweHeaders().getKeyEncryptionAlgorithm().getJwaName();
validateKeyEncryptionAlgorithm(keyAlgo);
return AlgorithmUtils.toJavaName(keyAlgo);
}
protected void validateKeyEncryptionAlgorithm(String keyAlgo) {
if (keyAlgo == null
|| !supportedAlgo.getJwaName().equals(keyAlgo)) {
reportInvalidKeyAlgorithm(keyAlgo);
}
}
protected void reportInvalidKeyAlgorithm(String keyAlgo) {
LOG.warning("Invalid key encryption algorithm: " + keyAlgo);
throw new JweException(JweException.Error.INVALID_KEY_ALGORITHM);
}
protected String getContentEncryptionAlgorithm(JweDecryptionInput jweDecryptionInput) {
return AlgorithmUtils.toJavaName(
jweDecryptionInput.getJweHeaders().getContentEncryptionAlgorithm().getJwaName());
}
protected AlgorithmParameterSpec getAlgorithmParameterSpec(JweDecryptionInput jweDecryptionInput) {
return null;
}
protected byte[] getEncryptedContentEncryptionKey(JweDecryptionInput jweDecryptionInput) {
return jweDecryptionInput.getEncryptedCEK();
}
@Override
public KeyAlgorithm getAlgorithm() {
return supportedAlgo;
}
}