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gnu.crypto.hash
Class MD5

java.lang.Object
  |
  +--gnu.crypto.hash.BaseHash
        |
        +--gnu.crypto.hash.MD5
All Implemented Interfaces:
java.lang.Cloneable, IMessageDigest

public class MD5
extends BaseHash

The MD5 message-digest algorithm takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. It is conjectured that it is computationally infeasible to produce two messages having the same message digest, or to produce any message having a given prespecified target message digest.

References:

  1. The MD5 Message- Digest Algorithm.
    R. Rivest.

Version:
$Revision: 1.4 $

Fields inherited from class gnu.crypto.hash.BaseHash
blockSize, buffer, count, hashSize, name
 
Constructor Summary
MD5()
          Trivial 0-arguments constructor.
 
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()
          Returns the byte array to use as padding before completing a hash operation.
protected  void resetContext()
          Resets the instance for future re-use.
 boolean selfTest()
          A basic test.
protected  void transform(byte[] in, int offset)
          The block digest transformation per se.
 
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

MD5

public MD5()
Trivial 0-arguments constructor.
Method Detail

clone

public java.lang.Object clone()
Description copied from interface: IMessageDigest

Returns a clone copy of this instance.

Overrides:
clone in class BaseHash
Following copied from interface: gnu.crypto.hash.IMessageDigest
Returns:
a clone copy of this instance.

transform

protected void transform(byte[] in,
                         int offset)
Description copied from class: BaseHash

The block digest transformation per se.

Overrides:
transform in class BaseHash
Following copied from class: gnu.crypto.hash.BaseHash
Parameters:
in - the blockSize long block, as an array of bytes to digest.
offset - the index where the data to digest is located within the input buffer.

padBuffer

protected byte[] padBuffer()
Description copied from class: BaseHash

Returns the byte array to use as padding before completing a hash operation.

Overrides:
padBuffer in class BaseHash
Following copied from class: gnu.crypto.hash.BaseHash
Returns:
the bytes to pad the remaining bytes in the buffer before completing a hash operation.

getResult

protected byte[] getResult()
Description copied from class: BaseHash

Constructs the result from the contents of the current context.

Overrides:
getResult in class BaseHash
Following copied from class: gnu.crypto.hash.BaseHash
Returns:
the output of the completed hash operation.

resetContext

protected void resetContext()
Description copied from class: BaseHash
Resets the instance for future re-use.
Overrides:
resetContext in class BaseHash

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.

Overrides:
selfTest in class BaseHash
Following copied from interface: gnu.crypto.hash.IMessageDigest
Returns:
true if the implementation passes a basic self-test. Returns false otherwise.

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