com.ibm.crypto.hdwrCCA.provider

Class MD5

java.lang.Object

java.security.MessageDigestSpi

com.ibm.crypto.hdwrCCA.provider.MD5

All Implemented Interfaces:

java.lang.Cloneable

public final class MD5
extends java.security.MessageDigestSpi
implements java.lang.Cloneable

The MD5 class is used to compute an MD5 message digest over a given buffer of bytes. It is an implementation of the RSA Data Security Inc. MD5 algorithm as described in Internet RFC 1321. This is done via a hardware crypto call.

Constructor Summary

Constructors

Constructor and Description
MD5() Standard constructor, creates a new MD5 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 MD5 hash.
protected int	engineDigest(byte[] buf, int offset, int len) Computes and returns the MD5 hash in the buffer provided.
protected int	engineGetDigestLength() Return the digest length in bytes.
protected void	engineReset() Resets the MD5 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 MD5 information for this object.

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

MD5

public MD5()

Standard constructor, creates a new MD5 instance, allocates its buffers from the heap.

Method Detail

init

public void init()

Initialize the MD5 information for this object.

engineReset

protected void engineReset()

Resets the MD5 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

Parameters:

b - is the byte to add to the digest.

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

Parameters:

input - array used to update the digest.

offset - the offset into the array.

len - the length of the array.

engineDigest

protected byte[] engineDigest()

Computes and returns the MD5 hash.

Specified by:

engineDigest in class java.security.MessageDigestSpi

Returns:

the MD5 hash.

engineDigest

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

Computes and returns the MD5 hash in the buffer provided.

Overrides:

engineDigest in class java.security.MessageDigestSpi

Parameters:

buf - the buffer to put the MD5 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 to hold the digest.

clone

public java.lang.Object clone()

Clones this object.

Overrides:

clone in class java.security.MessageDigestSpi