com.fasteasytrade.jrandtest.algo.BlowFish Maven / Gradle / Ivy
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/*
* Created on 16/02/2005
*
* JRandTest package
*
* Copyright (c) 2005, Zur Aougav, [email protected]
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* Neither the name of the JRandTest nor the names of its contributors may be
* used to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.fasteasytrade.jrandtest.algo;
import com.fasteasytrade.jrandtest.io.FileAlgoRandomStream;
/**
* Stream of random bytes from BFcipher class
*
*
* @author Zur Aougav
*/
public class BlowFish extends FileAlgoRandomStream {
/**
* actual class algorithm
*/
BFcipher bf = null;
/**
* default key
*/
byte[] defaultPublicKey = { 0x1, 0x2, 0x3, 0x5 };
/**
* input buffer to algorithm. Always full of 0x00's.
*/
byte[] inAlgoBuffer = new byte[256];
/**
* output buffer to algorithm. CBC fill it with different values.
*/
byte[] outAlgoBuffer = new byte[256];
int outAlgoBufferIx = outAlgoBuffer.length;
/**
* iv array to algorthm
*/
byte[] iv = { (byte)0xFE, (byte)0xDC, (byte)0xBA, (byte)0x98, (byte)0x76, (byte)0x54, (byte)0x32, (byte)0x10 };
public BlowFish() {
super();
}
public BlowFish(String keyFileName) {
super(keyFileName);
}
@Override
public String getFilename() {
return filename;
}
@Override
public void setFilename(String s) {
filename = s;
}
@Override
public void setupKeys() {
publicKeyLength = 256;
privateKeyLength = 256;
super.setupKeys();
}
@Override
public void setup() {
try {
if (publicKey == null) {
bf = new BFcipher(defaultPublicKey, iv);
} else {
bf = new BFcipher(publicKey, iv);
}
return;
} catch (Exception e) {
System.out.println(e);
}
/*
* if still we can not init BlowFish...
*/
if (bf == null) {
try {
bf = new BFcipher(publicKey, iv);
} catch (Exception e) {
System.out.println(e);
}
}
}
@Override
public boolean openInputStream() {
setup(); // just to be sure to reset all blowfish states
if (bf == null) {
return false;
}
if (filename != null) {
super.openInputStream();
}
count = 0;
countLastRead = SIZE;
actualSize = SIZE;
outAlgoBufferIx = outAlgoBuffer.length;
open = true;
return open;
}
@Override
public byte readByte() {
if (!isOpen()) {
return -1;
}
if (filename == null && count > maxCount) {
open = false;
return -1;
}
byte prng = -1;
/*
* encrypt file if exists
*/
if (filename != null) {
if (countLastRead == actualSize) { // end of buffer?
super.readByte(); // read & fill buffer from file
if (!isOpen()) {
return -1;
}
countLastRead = 0;
bf.EncryptBlock(buffer, buffer); // encrypt it
}
prng = buffer[countLastRead++];
count++;
return prng;
}
/*
* we have no real filename to encrypt
*/
if (outAlgoBufferIx == outAlgoBuffer.length) {
/*
* inAlgoBuffer is always full of 0x00's
*/
bf.EncryptBlock(inAlgoBuffer, outAlgoBuffer);
outAlgoBufferIx = 0;
}
prng = outAlgoBuffer[outAlgoBufferIx++];
count++;
return prng;
}
@Override
public int readInt() {
if (!isOpen()) {
return -1;
}
if (filename == null && count > maxCount) {
open = false;
return -1;
}
int prng = 0;
for (int i = 0; i < 4; i++) {
prng = (prng << 8) | (0xff & readByte());
}
if (filename == null) {
return prng;
}
/*
* we have a real filename to encrypt
*/
int data = super.readInt();
return (byte)(prng ^ data);
}
@Override
public long readLong() {
if (!isOpen()) {
return -1;
}
if (filename == null && count > maxCount) {
open = false;
return -1;
}
long prng = 0;
for (int i = 0; i < 8; i++) {
prng = (prng << 8) | (0xffL & readByte());
}
if (filename == null) {
return prng;
}
/*
* we have a real filename to encrypt
*/
long data = super.readLong();
return (byte)(prng ^ data);
}
}