com.ibm.crypto.hdwrCCA.provider

Class MD2

java.lang.Object

java.security.MessageDigestSpi

com.ibm.crypto.hdwrCCA.provider.MD2

All Implemented Interfaces:

java.lang.Cloneable

public final class MD2
extends java.security.MessageDigestSpi
implements java.lang.Cloneable

The MD2 class is used to compute an MD2 message digest over a given buffer of bytes. It is an implementation of the RSA Data Security Inc. MD2 algorithim as described in internet RFC 1319.

Constructor Summary

Constructors

Constructor and Description
MD2() Standard constructor, creates a new MD2 instance, allocates its buffers from the heap.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	clone() Clones this object.
protected byte[]	engineDigest() Computes and returns the MD2 hash.
protected int	engineDigest(byte[] buf, int offset, int len) Computes and returns the MD2 hash in the buffer provided.
protected int	engineGetDigestLength() Return the digest length in bytes.
protected void	engineReset() Resets the MD2 information back to starting values.
protected void	engineUpdate(byte b) Update adds the passed byte to the digested data.
protected void	engineUpdate(byte[] input, int offset, int len) Update adds the selected part of an array of bytes to the digest.
void	init() Initialize the MD2 information.

Methods inherited from class java.security.MessageDigestSpi

engineUpdate

Methods inherited from class java.lang.Object

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

Constructor Detail

MD2

public MD2()

Standard constructor, creates a new MD2 instance, allocates its buffers from the heap.

Method Detail

init

public void init()

Initialize the MD2 information.

engineReset

protected void engineReset()

Resets the MD2 information back to starting values.

Specified by:

engineReset in class java.security.MessageDigestSpi

engineGetDigestLength

protected int engineGetDigestLength()

Return the digest length in bytes.

Overrides:

engineGetDigestLength in class java.security.MessageDigestSpi

engineUpdate

protected void engineUpdate(byte b)

Update adds the passed byte to the digested data.

Specified by:

engineUpdate in class java.security.MessageDigestSpi

engineUpdate

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

Update adds the selected part of an array of bytes to the digest. This version is more efficient than the byte-at-a-time version; it avoids data copies and reduces per-byte call overhead.

Specified by:

engineUpdate in class java.security.MessageDigestSpi

engineDigest

protected byte[] engineDigest()

Computes and returns the MD2 hash.

Specified by:

engineDigest in class java.security.MessageDigestSpi

Returns:

the MD2 hash.

engineDigest

protected int engineDigest(byte[] buf,
                           int offset,
                           int len)
                    throws java.security.DigestException

Computes and returns the MD2 hash in the buffer provided.

Overrides:

engineDigest in class java.security.MessageDigestSpi

Parameters:

buf - the buffer to put the MD2 hash into.

offset - is the offset in the buffer into which to copy the hash.

len - the length of the buffer.

Throws:

java.security.DigestException - is thrown when the array is not large enough for the digest.

clone

public java.lang.Object clone()

Clones this object.

Overrides:

clone in class java.security.MessageDigestSpi

Returns:

Returns a new MD2 hash object like this one.