iaik.security.md
Class RipeMd128

java.lang.Object
  |
  +--java.security.MessageDigestSpi
        |
        +--java.security.MessageDigest
              |
              +--iaik.security.md.AbstractMessageDigest
                    |
                    +--iaik.security.md.RipeMd128

All Implemented Interfaces:

Cloneable

public class RipeMd128

extends iaik.security.md.AbstractMessageDigest

This class implements the RipeMd128 message digest algorithm. It produces a 128 bit digest (hence the name) and can be considered a good alternative to MD5 when a 128 bit seed is desired. It does not have the recently discovered weaknesses of MD5, however, it is about 40% slower than MD5 but still a lot faster than SHA-1 or RIPEMD160. The name of the algorithm to use with getInstance() is RIPEMD128.

For a specification of the algorithm see Fast Software Encryption, LCS 1039, Springer Verlag, 1996, pp. 71-82. Also available online from http://www.esat.kuleuven.ac.be/cosic/cosic.html.

Version:

File Revision 21

See Also:

MessageDigest

Constructor Summary

RipeMd128()
Creates a new RipeMd128 message digest object.

Method Summary

Object	clone() Returns a clone of this RipeMd128 Object.
protected byte[]	engineDigest() b>SPI: Completes the hash computation by performing final operations such as padding.
int	engineGetDigestLength() SPI: Returns the length of the digest in bytes.
protected void	engineReset() SPI: Resets this RipeMd128 message digest object for being supplied with new data.
protected void	engineUpdate(byte input) SPI: Updates the data to be hashed with the specified byte.
protected void	engineUpdate(byte[] input, int offset, int len) SPI: Updates the data to be hashed with the specified number of bytes, beginning at the specified offset within the given byte array.

Methods inherited from class java.security.MessageDigest

digest, digest, digest, getAlgorithm, getDigestLength, getInstance, getInstance, getProvider, isEqual, reset, toString, update, update, update

Methods inherited from class java.security.MessageDigestSpi

engineDigest

Methods inherited from class java.lang.Object

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

Constructor Detail

RipeMd128

public RipeMd128()

Creates a new RipeMd128 message digest object. Applications do not use this constructor. They shall use

 MessageDigest.getInstance("RIPEMD128");

for creating a MesssageDigest object.

See Also:

MessageDigest.getInstance(java.lang.String)

Method Detail

clone

public Object clone()

Returns a clone of this RipeMd128 Object.

Overrides:

clone in class iaik.security.md.AbstractMessageDigest

Returns:

a clone of this RipeMd128 Object

engineReset

protected void engineReset()

SPI: Resets this RipeMd128 message digest object for being supplied with new data.

This method is called by engineDigest after the actual hash computation has been finished to automatically reset the message digest object for being supplied with new data for starting a new hash computation.

Overrides:

engineReset in class iaik.security.md.AbstractMessageDigest

See Also:

AbstractMessageDigest.engineDigest()

engineUpdate

protected final void engineUpdate(byte input)

SPI: Updates the data to be hashed with the specified byte.

Overrides:

engineUpdate in class MessageDigestSpi

Parameters:

input - the byte to be used for updating.

engineUpdate

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

SPI: Updates the data to be hashed with the specified number of bytes, beginning at the specified offset within the given byte array.

Overrides:

engineUpdate in class MessageDigestSpi

Parameters:

input - the byte array holding the data to be used for this update operation.

offset - the offset, indicating the start position within the given byte array.

len - the number of bytes to be obtained from the given byte array, starting at the given position.

engineDigest

protected byte[] engineDigest()

b>SPI: Completes the hash computation by performing final operations such as padding. Once engineDigest has been called, the engine should be reset. Resetting is the responsibility of the engine implementor.

Overrides:

engineDigest in class MessageDigestSpi

Returns:

The computed hash value.

See Also:

AbstractMessageDigest.engineReset()

engineGetDigestLength

public int engineGetDigestLength()

SPI: Returns the length of the digest in bytes.

May not be available for applications before JDK versions >= 1.2.x.

Overrides:

engineGetDigestLength in class MessageDigestSpi

Returns:

the length of the digest in bytes.