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/*
* Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.security.GeneralSecurityException;
import java.security.Provider;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
/**
* Wrapper class to test a given SecretKeyFactory.PBKDF2 algorithm.
*/
public class PBKDF2Wrapper extends AbstractPBEWrapper {
/**
* Default salt size.
*/
public static final int PBKDF2_SALT_SIZE = 64;
/**
* Default key length.
*/
public static final int PKDF2_DEFAULT_KEY_LEN = 128;
/**
* Default transformation.
*/
public static final String CIPHER_TRANSFORMATION = "AES/CBC/PKCS5Padding";
/**
* Algorithm name.
*/
public static final String KEY_ALGORITHM = "AES";
/**
* Initialization vector length.
*/
private static final int IV_LENGTH = 16;
/**
* The buffer with the IV.
*/
private final byte[] iv;
/**
* PBKDF2Wrapper constructor. Instantiate Cipher using
* "AES/CBC/PKCS5Padding" transformation. Generate a secret key using PKDF2
* algorithms given in the "algo" parameter.
*
* @param algo AES-based PBE algorithm.
* @param passwd password phrase.
* @throws GeneralSecurityException all security exceptions are thrown.
*/
public PBKDF2Wrapper(PBEAlgorithm algo, String passwd)
throws GeneralSecurityException {
super(algo, passwd, PBKDF2_SALT_SIZE);
iv = TestUtilities.generateBytes(IV_LENGTH);
}
/**
* Initiate the Cipher object for PBKDF2 algorithm using given "mode".
*
* @param mode Cipher mode: encrypt or decrypt
* @return Cipher object for PBKDF2 algorithm
* @throws GeneralSecurityException all security exceptions are thrown.
*/
@Override
protected Cipher initCipher(int mode) throws GeneralSecurityException {
Provider provider = Security.getProvider("SunJCE");
if (provider == null) {
throw new RuntimeException("SunJCE provider does not exist.");
}
// Generate secret key
PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray(),
salt, DEFAULT_ITERATION, PKDF2_DEFAULT_KEY_LEN);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(baseAlgo);
SecretKey key = keyFactory.generateSecret(pbeKeySpec);
// get Cipher instance
Cipher cipher = Cipher.getInstance(CIPHER_TRANSFORMATION, provider);
cipher.init(mode,
new SecretKeySpec(key.getEncoded(),KEY_ALGORITHM),
new IvParameterSpec(iv));
return cipher;
}
}
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