gnu.crypto.tool.NessieHashTVEmitter Maven / Gradle / Ivy
package gnu.crypto.tool;
// ----------------------------------------------------------------------------
// $Id: NessieHashTVEmitter.java,v 1.3 2002/11/07 17:17:46 raif Exp $
//
// Copyright (C) 2001, 2002, Free Software Foundation, Inc.
//
// This file is part of GNU Crypto.
//
// GNU Crypto is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
//
// GNU Crypto 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 for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; see the file COPYING. If not, write to the
//
// Free Software Foundation Inc.,
// 59 Temple Place - Suite 330,
// Boston, MA 02111-1307
// USA
//
// Linking this library statically or dynamically with other modules is
// making a combined work based on this library. Thus, the terms and
// conditions of the GNU General Public License cover the whole
// combination.
//
// As a special exception, the copyright holders of this library give
// you permission to link this library with independent modules to
// produce an executable, regardless of the license terms of these
// independent modules, and to copy and distribute the resulting
// executable under terms of your choice, provided that you also meet,
// for each linked independent module, the terms and conditions of the
// license of that module. An independent module is a module which is
// not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the
// library, but you are not obligated to do so. If you do not wish to
// do so, delete this exception statement from your version.
// ----------------------------------------------------------------------------
import gnu.crypto.hash.HashFactory;
import gnu.crypto.hash.IMessageDigest;
import gnu.crypto.util.Util;
/**
* A utility class to generate NESSIE test vectors for a designated hash
* algorithm.
*
* NOTE: The test3 test vector will be generated iff the global
* system environment variable named "TORTURE" is set. It is skipped otherwise.
*
* @version $Revision: 1.3 $
*/
public class NessieHashTVEmitter {
// Constants and variables
// -------------------------------------------------------------------------
// Constructor(s)
// -------------------------------------------------------------------------
/** Trivial 0-arguments constructor to enforce Singleton pattern. */
private NessieHashTVEmitter() {
super();
}
// Class methods
// -------------------------------------------------------------------------
public static final void main(String[] args) {
try {
IMessageDigest md = HashFactory.getInstance(args[0]);
long time = -System.currentTimeMillis();
test1(md);
test2(md);
test3(md);
time += System.currentTimeMillis();
System.out.println();
System.out.println("End of test vectors");
System.out.println();
System.out.println("*** Tests lasted "+time+" ms...");
} catch (Exception x) {
x.printStackTrace(System.err);
}
}
private static void test1(IMessageDigest md) {
byte[] data = new byte[128];
byte[] result;
System.out.println("Message digests of strings of 0-bits and length L:");
for (int i = 0; i < 128; i++) {
System.out.print(" L = ");
String s = " "+String.valueOf(8*i);
System.out.print(s.substring(s.length()-4));
System.out.print(": ");
md.update(data, 0, i);
result = md.digest();
System.out.println(Util.toString(result));
}
}
private static void test2(IMessageDigest md) {
int bl = md.hashSize();
byte[] data = new byte[bl];
byte[] result;
System.out.println("Message digests of all "+(String.valueOf(8*bl))
+"-bit strings S containing a single 1-bit:");
for (int i = 0; i < bl; i++)
for (int j = 0; j < 8; j++) {
data[i] = (byte)(1 << (7-j));
System.out.print(" S = "+Util.toString(data)+": ");
md.update(data, 0, bl);
result = md.digest();
System.out.println(Util.toString(result));
data[i] = 0x00;
}
}
private static void test3(IMessageDigest md) {
// this is torture for low-speed CPUs. only execute if global env var
// TORTURE is set!
String dummy = System.getProperty("TORTURE");
if (dummy == null) {
return;
}
int bl = md.hashSize();
byte[] data = new byte[bl];
int limit = 100000000;
System.out.print("Iterated message digest computation ("
+String.valueOf(limit)+" times): ");
for (int i = 0; i < limit; i++) {
md.update(data, 0, bl);
data = md.digest();
}
System.out.println(Util.toString(data));
}
}