gnu.java.security.hash

Class Haval

Implemented Interfaces:
Cloneable, IMessageDigest

public class Haval
extends BaseHash

The HAVAL message-digest algorithm is a variable output length, with variable number of rounds. By default, this implementation allows HAVAL to be used as a drop-in replacement for MD5.

References:

  1. HAVAL - A One-Way Hashing Algorithm with Variable Length of Output
    Advances in Cryptology - AUSCRYPT'92, Lecture Notes in Computer Science,
    Springer-Verlag, 1993;
    Y. Zheng, J. Pieprzyk and J. Seberry.

Field Summary

static int
HAVAL_128_BIT
static int
HAVAL_160_BIT
static int
HAVAL_192_BIT
static int
HAVAL_224_BIT
static int
HAVAL_256_BIT
static int
HAVAL_3_ROUND
static int
HAVAL_4_ROUND
static int
HAVAL_5_ROUND
static int
HAVAL_VERSION

Fields inherited from class gnu.java.security.hash.BaseHash

blockSize, buffer, count, hashSize, name

Constructor Summary

Haval()
Calls the constructor with two argument using HAVAL_128_BIT as the value for the output size (i.e.
Haval(int size)
Calls the constructor with two arguments using the designated output size, and HAVAL_3_ROUND for the value of number of rounds.
Haval(int size, int rounds)
Constructs a Haval instance with the designated output size (in bytes).

Method Summary

Object
clone()
protected byte[]
getResult()
protected byte[]
padBuffer()
protected void
resetContext()
boolean
selfTest()
protected void
transform(byte[] in, int i)

Methods inherited from class gnu.java.security.hash.BaseHash

blockSize, clone, digest, getResult, hashSize, name, padBuffer, reset, resetContext, selfTest, transform, update, update, update

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

HAVAL_128_BIT

public static final int HAVAL_128_BIT
Field Value:
16

HAVAL_160_BIT

public static final int HAVAL_160_BIT
Field Value:
20

HAVAL_192_BIT

public static final int HAVAL_192_BIT
Field Value:
24

HAVAL_224_BIT

public static final int HAVAL_224_BIT
Field Value:
28

HAVAL_256_BIT

public static final int HAVAL_256_BIT
Field Value:
32

HAVAL_3_ROUND

public static final int HAVAL_3_ROUND
Field Value:
3

HAVAL_4_ROUND

public static final int HAVAL_4_ROUND
Field Value:
4

HAVAL_5_ROUND

public static final int HAVAL_5_ROUND
Field Value:
5

HAVAL_VERSION

public static final int HAVAL_VERSION
Field Value:
1

Constructor Details

Haval

public Haval()
Calls the constructor with two argument using HAVAL_128_BIT as the value for the output size (i.e. 128 bits, and HAVAL_3_ROUND for the value of number of rounds.

Haval

public Haval(int size)
Calls the constructor with two arguments using the designated output size, and HAVAL_3_ROUND for the value of number of rounds.
Parameters:
size - the output size in bytes of this instance.
Throws:
IllegalArgumentException - if the designated output size is invalid.

Haval

public Haval(int size,
             int rounds)
Constructs a Haval instance with the designated output size (in bytes). Valid output size values are 16, 20, 24, 28 and 32. Valid values for rounds are in the range 3..5 inclusive.
Parameters:
size - the output size in bytes of this instance.
rounds - the number of rounds to apply when transforming data.
Throws:
IllegalArgumentException - if the designated output size is invalid, or if the number of rounds is invalid.

Method Details

clone

public Object clone()
Specified by:
clone in interface IMessageDigest
Overrides:
clone in interface BaseHash

getResult

protected byte[] getResult()
Overrides:
getResult in interface BaseHash

padBuffer

protected byte[] padBuffer()
Overrides:
padBuffer in interface BaseHash

resetContext

protected void resetContext()
Overrides:
resetContext in interface BaseHash

selfTest

public boolean selfTest()
Specified by:
selfTest in interface IMessageDigest
Overrides:
selfTest in interface BaseHash

transform

protected void transform(byte[] in,
                         int i)
Overrides:
transform in interface BaseHash

Haval.java -- Copyright (C) 2003, 2006 Free Software Foundation, Inc. This file is a part of GNU Classpath. GNU Classpath 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 of the License, or (at your option) any later version. GNU Classpath 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 GNU Classpath; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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.