cryptix.provider.md
Class SHA0

java.lang.Object
  java.security.MessageDigestSpi
      java.security.MessageDigest
          cryptix.provider.md.BlockMessageDigest
              cryptix.provider.md.SHA0

All Implemented Interfaces:

java.lang.Cloneable

public final class SHA0
extends BlockMessageDigest
implements java.lang.Cloneable

This class implements the SHA-0 message digest algorithm (not to be confused with the revised SHA-1 algorithm). SHA-1 is preferred for new applications.

BUG: The update method is missing.

References:

1. NIST FIPS PUB 180, "Secure Hash Standard", U.S. Department of Commerce, May 1993.

Copyright © 1995-1997 Systemics Ltd on behalf of the Cryptix Development Team.
All rights reserved.

$Revision: 1.7 $

Since:

Cryptix 2.2.2

Author:

Systemics Ltd, David Hopwood

Field Summary

static int	DATA_LENGTH Length of a block (i.e.
static int	HASH_LENGTH Length of the final hash (in bytes).

Constructor Summary

SHA0()
The public constructor.

Method Summary

java.lang.Object	clone() Returns a copy of this MD object.
protected byte[]	engineDigest(byte[] in, int length) Returns the digest of the data added and resets the digest.
protected int	engineGetDataLength() Returns the length of the data (in bytes) hashed in every transform.
protected int	engineGetDigestLength() Returns the length of the hash (in bytes).
protected void	engineReset() Initializes (resets) the message digest.
protected void	engineTransform(byte[] in) Adds data to the message digest.
static void	main(java.lang.String[] argv) Entry point for self_test.
static void	self_test() Do some basic tests.

Methods inherited from class cryptix.provider.md.BlockMessageDigest

bitcount, engineDigest, engineUpdate, engineUpdate

Methods inherited from class java.security.MessageDigest

digest, digest, digest, getAlgorithm, getDigestLength, getInstance, getInstance, getInstance, getProvider, isEqual, reset, toString, update, update, update, update

Methods inherited from class java.security.MessageDigestSpi

engineDigest, engineUpdate

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

HASH_LENGTH

public static final int HASH_LENGTH

Length of the final hash (in bytes).

See Also:

Constant Field Values

DATA_LENGTH

public static final int DATA_LENGTH

Length of a block (i.e. the number of bytes hashed in every transform).

See Also:

Constant Field Values

Constructor Detail

SHA0

public SHA0()

The public constructor.

Method Detail

engineGetDigestLength

protected int engineGetDigestLength()

Returns the length of the hash (in bytes).

Overrides:

engineGetDigestLength in class java.security.MessageDigestSpi

engineGetDataLength

protected int engineGetDataLength()

Returns the length of the data (in bytes) hashed in every transform.

Specified by:

engineGetDataLength in class BlockMessageDigest

clone

public java.lang.Object clone()

Returns a copy of this MD object.

Overrides:

clone in class java.security.MessageDigest

engineReset

protected void engineReset()

Initializes (resets) the message digest.

Overrides:

engineReset in class BlockMessageDigest

engineTransform

protected void engineTransform(byte[] in)

Adds data to the message digest.

Specified by:

engineTransform in class BlockMessageDigest

Parameters:

data - The data to be added.

offset - The start of the data in the array.

length - The amount of data to add.

engineDigest

protected byte[] engineDigest(byte[] in,
                              int length)

Returns the digest of the data added and resets the digest.

Specified by:

engineDigest in class BlockMessageDigest

Parameters:

in - the last incomplete block.

length - the length in bytes of the last block.

Returns:

the digest of all the data added to the message digest as a byte array.

main

public static final void main(java.lang.String[] argv)

Entry point for self_test.

self_test

public static final void self_test()
                            throws java.lang.Exception

Do some basic tests. Three of the validation data are included only, no output, success or exception. If you want more, write a test program!

Throws:

java.lang.Exception

See Also:

TestSHA0