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/*
* Created on 08/04/2005
*
* 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;
/**
* ZAC3 algorithm as a random stream based on ZAC3 encryption algorithm.
*
* @author Zur Aougav
*/
public class ZAC3Random extends FileAlgoRandomStream {
ZAC3 algo = null;
/**
* inputAlgoBuffer is filled with zeros to ZAC3.
*/
byte[] inputAlgoBuffer = new byte[128];
/**
* The buffer is used as an output to ZAC3.
*/
byte[] outAlgoBuffer = new byte[256];
int outAlgoBufferIx = outAlgoBuffer.length;
public ZAC3Random() {
super();
}
public ZAC3Random(String keyFileName) {
super(keyFileName);
}
@Override
public void setupKeys() {
super.setupKeys();
}
@Override
public void setup() {
/**
* makes only once a new SHA1 object and an IV vector.
*/
if (algo == null) {
algo = new ZAC3(null, null, null);
algo.initEncrypt();
} else {
algo.reset();
}
}
@Override
public boolean openInputStream() {
if (filename != null) {
super.openInputStream();
}
setup(); // make sure algorithm and keys/states are reset
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;
}
if (outAlgoBufferIx == outAlgoBuffer.length) {
algo.encrypt(inputAlgoBuffer, outAlgoBuffer);
outAlgoBufferIx = 0;
}
byte prng = outAlgoBuffer[outAlgoBufferIx++];
if (filename == null) {
count++;
return prng;
}
/*
* we have a real filename to encrypt
*/
byte data = super.readByte();
return (byte)(prng ^ data);
}
@Override
public int readInt() {
if (!isOpen()) {
return -1;
}
if (filename == null && count > maxCount) {
open = false;
return -1;
}
int prng = 0xff & readByte();
prng = (prng << 8) | (0xff & readByte());
prng = (prng << 8) | (0xff & readByte());
prng = (prng << 8) | (0xff & readByte());
return prng;
}
@Override
public long readLong() {
if (!isOpen()) {
return -1;
}
if (filename == null && count > maxCount) {
open = false;
return -1;
}
long prng = 0xff & readByte();
for (int i = 0; i < 7; i++) {
prng = (prng << 8) | (0xff & readByte());
}
return prng;
}
public static void main(String[] args) {
if (args != null && args.length > 0 && args[0] != null) {
ZAC3Random algo = new ZAC3Random();
algo.setup();
try {
algo.openInputStream();
for (int i = 0; i < 100; i++) {
System.out.print(algo.readByte());
System.out.print(",");
}
System.out.println();
} catch (Exception e) {
System.out.println("" + e);
}
}
}
}
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