/**
* 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 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;
public class PbesHmacAesWrapKeyDecryptionAlgorithm implements KeyDecryptionProvider {
private byte[] password;
private KeyAlgorithm algo;
public PbesHmacAesWrapKeyDecryptionAlgorithm(String password) {
this(password, KeyAlgorithm.PBES2_HS256_A128KW, false);
}
public PbesHmacAesWrapKeyDecryptionAlgorithm(String password, KeyAlgorithm algo, boolean hashLargePasswords) {
this(PbesHmacAesWrapKeyEncryptionAlgorithm.stringToBytes(password), algo, hashLargePasswords);
}
public PbesHmacAesWrapKeyDecryptionAlgorithm(char[] password) {
this(password, KeyAlgorithm.PBES2_HS256_A128KW, false);
}
public PbesHmacAesWrapKeyDecryptionAlgorithm(char[] password, KeyAlgorithm algo, boolean hashLargePasswords) {
this(PbesHmacAesWrapKeyEncryptionAlgorithm.charsToBytes(password), algo, hashLargePasswords);
}
public PbesHmacAesWrapKeyDecryptionAlgorithm(byte[] password) {
this(password, KeyAlgorithm.PBES2_HS256_A128KW, false);
}
public PbesHmacAesWrapKeyDecryptionAlgorithm(byte[] password, KeyAlgorithm algo, boolean hashLargePasswords) {
this.password =
PbesHmacAesWrapKeyEncryptionAlgorithm.validatePassword(password, algo.getJwaName(), hashLargePasswords);
this.algo = algo;
}
@Override
public byte[] getDecryptedContentEncryptionKey(JweDecryptionInput jweDecryptionInput) {
JweHeaders jweHeaders = jweDecryptionInput.getJweHeaders();
byte[] saltInput = getDecodedBytes(jweHeaders.getHeader("p2s"));
int pbesCount = jweHeaders.getIntegerHeader("p2c");
String keyAlgoJwt = jweHeaders.getKeyEncryptionAlgorithm().getJwaName();
int keySize = PbesHmacAesWrapKeyEncryptionAlgorithm.getKeySize(keyAlgoJwt);
byte[] derivedKey = PbesHmacAesWrapKeyEncryptionAlgorithm
.createDerivedKey(keyAlgoJwt, keySize, password, saltInput, pbesCount);
KeyDecryptionProvider aesWrap = new AesWrapKeyDecryptionAlgorithm(derivedKey, algo) {
protected boolean isValidAlgorithmFamily(String wrapAlgo) {
return AlgorithmUtils.isPbesHsWrap(wrapAlgo);
}
};
return aesWrap.getDecryptedContentEncryptionKey(jweDecryptionInput);
}
private byte[] getDecodedBytes(Object p2sHeader) {
try {
return Base64UrlUtility.decode(p2sHeader.toString());
} catch (Exception ex) {
throw new JoseException(ex);
}
}
@Override
public KeyAlgorithm getAlgorithm() {
return algo;
}
}