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gnu.crypto.hash
Class MD2

java.lang.Object
 extended bygnu.crypto.hash.BaseHash
 extended bygnu.crypto.hash.MD2

All Implemented Interfaces:

java.lang.Cloneable, IMessageDigest

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public class MD2

extends BaseHash

An implementation of the MD2 message digest algorithm.

MD2 is not widely used. Unless it is needed for compatibility with existing systems, it is not recommended for use in new applications.

References:

1. The MD2 Message-Digest Algorithm.
   B. Kaliski.
2. The RFC ERRATA PAGE under section RFC 1319.

Version:

$Revision: 1.2 $

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Field Summary

Fields inherited from class gnu.crypto.hash.BaseHash

blockSize, buffer, count, hashSize, name

Constructor Summary

MD2() Creates a new MD2 digest ready for use.

Method Summary
java.lang.Object	clone() Returns a clone copy of this instance.
protected byte[]	getResult() Constructs the result from the contents of the current context.
protected byte[]	padBuffer() Generates an array of padding bytes.
protected void	resetContext() Resets the instance for future re-use.
boolean	selfTest() A basic test.
protected void	transform(byte[] in, int off) Adds BLOCK_LENGTH bytes to the running digest.

Methods inherited from class gnu.crypto.hash.BaseHash

blockSize, digest, hashSize, name, reset, update, update

Methods inherited from class java.lang.Object

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

Constructor Detail

MD2

public MD2()

Creates a new MD2 digest ready for use.

Method Detail

clone

public java.lang.Object clone()

Description copied from interface: IMessageDigest

Returns a clone copy of this instance.

Specified by:

clone in interface IMessageDigest

Specified by:

clone in class BaseHash

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getResult

protected byte[] getResult()

Description copied from class: BaseHash

Constructs the result from the contents of the current context.

Specified by:

getResult in class BaseHash

Returns:

the output of the completed hash operation.

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resetContext

protected void resetContext()

Description copied from class: BaseHash

Resets the instance for future re-use.

Specified by:

resetContext in class BaseHash

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selfTest

public boolean selfTest()

Description copied from interface: IMessageDigest

A basic test. Ensures that the digest of a pre-determined message is equal to a known pre-computed value.

Specified by:

selfTest in interface IMessageDigest

Specified by:

selfTest in class BaseHash

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padBuffer

protected byte[] padBuffer()

Generates an array of padding bytes. The padding is defined as i bytes of value i, where i is the number of bytes to fill the last block of the message to BLOCK_LENGTH bytes (or BLOCK_LENGTH bytes when the last block was completely full).

Specified by:

padBuffer in class BaseHash

Returns:

the bytes to pad the remaining bytes in the buffer before completing a hash operation.

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transform

protected void transform(byte[] in,
 int off)

Adds BLOCK_LENGTH bytes to the running digest.

Specified by:

transform in class BaseHash

Parameters:

in - the byte array to take the BLOCK_LENGTH bytes from.

off - the offset to start from in the given byte array.

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