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/*
* Copyright (c) 2012, 2014, 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.io.PrintStream;
import java.util.Random;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
/**
* PBEWrapper is the abstract class for all concrete PBE Cipher wrappers. A
* PBEWrapper object encapsulates the information and behavior needed to test if
* the multiple-part encryption/decryption is performing by expected way on the
* same byte buffer.
*
* @author Alexandr Fomin
* @author rhalade
*/
public abstract class PBEWrapper {
protected final static int ITERATION_COUNT = 1000;
protected final SecretKey key;
protected final Cipher ci;
protected final String algo;
protected final PrintStream out;
public PBEWrapper(String pAlgo, SecretKey pKey, Cipher pCi,
PrintStream pOut ){
this.algo = pAlgo;
this.key = pKey;
this.ci = pCi;
this.out = pOut;
}
/**
* Abstract method need to be implemented in the subclasses.
*
* @param edMode Cipher mode - encrypt/decrypt
* @param inputText byte buffer to process
* @param offset offset in byte the inputText
* @param len length of byte to process in inputText
* @return true if cipher operation is successful, false otherwise
*/
public abstract boolean execute(int edMode, byte[] inputText, int offset,
int len);
/**
* An utility method to prepare "salt" for following Secret Key generation.
*
* @param numberOfBytes number of bytes in salt
* @return randomly generated byte array
*/
protected static byte[] generateSalt(int numberOfBytes) {
byte[] salt = new byte[numberOfBytes];
new Random().nextBytes(salt);
return salt;
}
/**
* An utility method to check if two byte arrays are equal
*
* @param b1 first byte array
* @param off1 offset to compare from in b1
* @param b2 second byte array
* @param off2 offset to compare from in b2
* @param len length to compare
* @return true of arrays are equal, false otherwise
*/
protected boolean equalsBlock(byte[] b1, int off1,
byte[] b2, int off2, int len) {
for (int i = off1, j = off2, k = 0; k < len; i++, j++, k++) {
if (b1[i] != b2[j]) {
return false;
}
}
return true;
}
}
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