/*
* Copyright 2010-2011 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
*
* 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 com.springsource.greenhouse.database.upgrade.v3;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
class CipherUtils {
private CipherUtils() {
}
public static SecretKey newSecretKey(String algorithm, String secret) {
try {
PBEKeySpec pbeKeySpec = new PBEKeySpec(secret.toCharArray());
SecretKeyFactory factory = SecretKeyFactory.getInstance(algorithm);
return factory.generateSecret(pbeKeySpec);
} catch (NoSuchAlgorithmException e) {
throw new IllegalArgumentException("Not a valid encryption algorithm", e);
} catch (InvalidKeySpecException e) {
throw new IllegalArgumentException("Not a valid secert key", e);
}
}
public static Cipher newCipher(String algorithm) {
try {
return Cipher.getInstance(algorithm);
} catch (NoSuchAlgorithmException e) {
throw new IllegalArgumentException("Not a valid encryption algorithm", e);
} catch (NoSuchPaddingException e) {
throw new IllegalStateException("Should not happen", e);
}
}
public static void initCipher(Cipher cipher, int mode, SecretKey secretKey, byte[] salt, int iterationCount) {
try {
cipher.init(mode, secretKey, new PBEParameterSpec(salt, iterationCount));
} catch (InvalidKeyException e) {
throw new IllegalArgumentException("Unable to initialize due to invalid secret key", e);
} catch (InvalidAlgorithmParameterException e) {
throw new IllegalStateException("Unable to initialize due to invalid decryption parameter spec", e);
}
}
public static byte[] doFinal(Cipher cipher, byte[] input) {
try {
return cipher.doFinal(input);
} catch (IllegalBlockSizeException e) {
throw new IllegalStateException("Unable to invoke Cipher due to illegal block size", e);
} catch (BadPaddingException e) {
throw new IllegalStateException("Unable to invoke Cipher due to bad padding", e);
}
}
}