/**
* 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
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*/
package org.apache.cxf.rs.security.jose.jwe;
import java.security.spec.AlgorithmParameterSpec;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import javax.crypto.SecretKey;
import org.apache.cxf.common.util.Base64UrlUtility;
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 AesGcmWrapKeyEncryptionAlgorithm extends AbstractWrapKeyEncryptionAlgorithm {
private static final Set<String> SUPPORTED_ALGORITHMS = new HashSet<>(
Arrays.asList(KeyAlgorithm.A128GCMKW.getJwaName(),
KeyAlgorithm.A192GCMKW.getJwaName(),
KeyAlgorithm.A256GCMKW.getJwaName()));
public AesGcmWrapKeyEncryptionAlgorithm(String encodedKey, KeyAlgorithm keyAlgoJwt) {
this(CryptoUtils.decodeSequence(encodedKey), keyAlgoJwt);
}
public AesGcmWrapKeyEncryptionAlgorithm(byte[] keyBytes, KeyAlgorithm keyAlgoJwt) {
this(CryptoUtils.createSecretKeySpec(keyBytes, AlgorithmUtils.AES),
keyAlgoJwt);
}
public AesGcmWrapKeyEncryptionAlgorithm(SecretKey key, KeyAlgorithm keyAlgoJwt) {
super(key, keyAlgoJwt, true, SUPPORTED_ALGORITHMS);
}
@Override
public byte[] getEncryptedContentEncryptionKey(JweHeaders headers, byte[] cek) {
byte[] wrappedKeyAndTag = super.getEncryptedContentEncryptionKey(headers, cek);
byte[] wrappedKey = new byte[wrappedKeyAndTag.length - 128 / 8];
System.arraycopy(wrappedKeyAndTag, 0, wrappedKey, 0, wrappedKeyAndTag.length - 128 / 8);
String encodedTag = Base64UrlUtility.encodeChunk(wrappedKeyAndTag,
wrappedKeyAndTag.length - 128 / 8, 128 / 8);
headers.setHeader("tag", encodedTag);
return wrappedKey;
}
protected AlgorithmParameterSpec getAlgorithmParameterSpec(JweHeaders headers) {
byte[] iv = CryptoUtils.generateSecureRandomBytes(96 / 8);
String encodedIv = Base64UrlUtility.encode(iv);
headers.setHeader("iv", encodedIv);
return CryptoUtils.getContentEncryptionCipherSpec(128, iv);
}
}