/**
* JBoss, Home of Professional Open Source
* Copyright Red Hat, Inc., and individual contributors.
*
* 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
*
* 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.jboss.aerogear.crypto;
import org.bouncycastle.crypto.engines.AESEngine;
import org.bouncycastle.crypto.modes.AEADBlockCipher;
import org.bouncycastle.crypto.modes.GCMBlockCipher;
import static org.jboss.aerogear.AeroGearCrypto.Mode;
import static org.jboss.aerogear.AeroGearCrypto.Mode.GCM;
/**
* Representation of the cipher modes supported
*/
public class BlockCipher {
private BlockCipher() {
}
public static AEADBlockCipher getInstance() {
return getNewCipher(GCM);
}
/**
* Retrieve a new instance of the block mode provided
* @param blockMode block mode name
* @return instance to the block mode
*/
public static AEADBlockCipher getNewCipher(Mode blockMode) {
AESEngine aesEngine = new AESEngine();
switch (blockMode) {
case GCM:
return new GCMBlockCipher(aesEngine);
default:
throw new RuntimeException("Block cipher not found");
}
}
/**
* Generates a non-predictable initialization vector
* @return byte array with the initialization vector generated
*/
public static byte[] getIV() {
return RandomUtils.randomBytes();
}
}