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gnu.crypto.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.

Version:
$Revision: 1.2 $

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.crypto.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.crypto.hash.BaseHash

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

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.

See Also:
HAVAL_128_BIT, HAVAL_160_BIT, HAVAL_192_BIT, HAVAL_224_BIT, HAVAL_256_BIT

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.

See Also:
HAVAL_128_BIT, HAVAL_160_BIT, HAVAL_192_BIT, HAVAL_224_BIT, HAVAL_256_BIT, HAVAL_3_ROUND, HAVAL_4_ROUND, HAVAL_5_ROUND

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

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