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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.SecretKey;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
/**
* Default wrapper for a password based encryption Cipher.
*/
public class DefaultPBEWrapper extends AbstractPBEWrapper {
/**
* Define default SALT size as 8.
*/
private static final int PBE_SALT_SIZE = 8;
/**
* Default PBE wrapper constructor.
*
* @param algo PGE algorithm to wrap.
* @param passwd password phrase
*/
public DefaultPBEWrapper(PBEAlgorithm algo, String passwd) {
super(algo, passwd, PBE_SALT_SIZE);
}
/**
* Instantiate Cipher for the PBE algorithm.
*
* @param mode Cipher mode: encrypt or decrypt.
* @return Cipher in accordance to the PBE algorithm
* @throws java.security.GeneralSecurityException
*/
@Override
protected Cipher initCipher(int mode) throws GeneralSecurityException {
Provider provider = Security.getProvider("SunJCE");
if (provider == null) {
throw new RuntimeException("SunJCE provider does not exist.");
}
SecretKey key = SecretKeyFactory.getInstance(baseAlgo)
.generateSecret(new PBEKeySpec(password.toCharArray()));
Cipher ci = Cipher.getInstance(transformation, provider);
ci.init(mode, key, new PBEParameterSpec(salt, DEFAULT_ITERATION));
return ci;
}
}
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