org.jboss.crypto.digest
Class SHAReverseInterleave

java.lang.Object
  java.security.MessageDigestSpi
      org.jboss.crypto.digest.SHAReverseInterleave

public class SHAReverseInterleave

extends java.security.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/).

SHAReverseInterleave

public SHAReverseInterleave()

Creates a new instance of SHAReverseInterleave

Throws:

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

engineGetDigestLength

protected int engineGetDigestLength()

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.

Returns:

the array of bytes for the resulting digest value.

engineReset

protected void engineReset()

Resets the digest for further use.

engineUpdate

protected void engineUpdate(byte input)

Updates the digest using the specified byte.

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.

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.