org.jboss.crypto.digest

Class SHAReverseInterleave

java.lang.Object

java.security.MessageDigestSpi

org.jboss.crypto.digest.SHAReverseInterleave

public class SHAReverseInterleave
extends MessageDigestSpi

An alternate SHA Interleave algorithm as implemented in the SRP distribution. This version reverses the even and odd byte streams before performing the SHA digest. This product includes software developed by Tom Wu and Eugene Jhong for the SRP Distribution (http://srp.stanford.edu/srp/).

Version:

$Revision$

Author:

Scott.Stark@jboss.org

Constructor Summary

Constructors

Constructor and Description
SHAReverseInterleave() Creates a new instance of SHAReverseInterleave

Method Summary

Modifier and Type	Method and Description
protected byte[]	engineDigest() Completes the digest computation by performing final operations such as padding.
protected int	engineGetDigestLength()
protected void	engineReset() Resets the digest for further use.
protected void	engineUpdate(byte input) Updates the digest using the specified byte.
protected void	engineUpdate(byte[] input, int offset, int len) Updates the digest using the specified array of bytes, starting at the specified offset.

Methods inherited from class java.security.MessageDigestSpi

clone, engineDigest, engineUpdate

Methods inherited from class java.lang.Object

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

Constructor Detail

SHAReverseInterleave

public SHAReverseInterleave()

Creates a new instance of SHAReverseInterleave

Throws:

ProviderException - thrown if MessageDigest.getInstance("SHA") throws a NoSuchAlgorithmException.

Method Detail

engineGetDigestLength

protected int engineGetDigestLength()

Overrides:

engineGetDigestLength in class MessageDigestSpi

engineDigest

protected byte[] engineDigest()

Completes the digest computation by performing final operations such as padding. Once engineDigest has been called, the engine should be reset (see engineReset). Resetting is the responsibility of the engine implementor.

Specified by:

engineDigest in class MessageDigestSpi

Returns:

the array of bytes for the resulting digest value.

engineReset

protected void engineReset()

Resets the digest for further use.

Specified by:

engineReset in class MessageDigestSpi

engineUpdate

protected void engineUpdate(byte input)

Updates the digest using the specified byte.

Specified by:

engineUpdate in class MessageDigestSpi

Parameters:

input - the byte to use for the update.

engineUpdate

protected void engineUpdate(byte[] input,
                            int offset,
                            int len)

Updates the digest using the specified array of bytes, starting at the specified offset.

Specified by:

engineUpdate in class MessageDigestSpi

Parameters:

input - the array of bytes to use for the update.

offset - the offset to start from in the array of bytes.

len - the input of bytes to use, starting at offset.