org.springframework.security.crypto.encrypt.BouncyCastleAesBytesEncryptor Maven / Gradle / Ivy
/*
* Copyright 2011-2016 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.security.crypto.encrypt;
import org.bouncycastle.crypto.PBEParametersGenerator;
import org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator;
import org.bouncycastle.crypto.params.KeyParameter;
import org.springframework.security.crypto.codec.Hex;
import org.springframework.security.crypto.keygen.BytesKeyGenerator;
import org.springframework.security.crypto.keygen.KeyGenerators;
/**
* Base class for AES-256 encryption using Bouncy Castle.
*
* @author William Tran
*
*/
abstract class BouncyCastleAesBytesEncryptor implements BytesEncryptor {
final KeyParameter secretKey;
final BytesKeyGenerator ivGenerator;
BouncyCastleAesBytesEncryptor(String password, CharSequence salt) {
this(password, salt, KeyGenerators.secureRandom(16));
}
BouncyCastleAesBytesEncryptor(String password, CharSequence salt, BytesKeyGenerator ivGenerator) {
if (ivGenerator.getKeyLength() != 16) {
throw new IllegalArgumentException("ivGenerator key length != block size 16");
}
this.ivGenerator = ivGenerator;
PBEParametersGenerator keyGenerator = new PKCS5S2ParametersGenerator();
byte[] pkcs12PasswordBytes = PBEParametersGenerator.PKCS5PasswordToUTF8Bytes(password.toCharArray());
keyGenerator.init(pkcs12PasswordBytes, Hex.decode(salt), 1024);
this.secretKey = (KeyParameter) keyGenerator.generateDerivedParameters(256);
}
}