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gnu.java.security.hash
Class MD5  

java.lang.Object
  gnu.java.security.hash.BaseHash
      gnu.java.security.hash.MD5

All Implemented Interfaces:

java.lang.Cloneable, IMessageDigest

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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.

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Field Summary
private static int	BLOCK_SIZE
private static java.lang.String	DIGEST0
private  int	h0           128-bit interim result.
private  int	h1           128-bit interim result.
private  int	h2           128-bit interim result.
private  int	h3           128-bit interim result.
private static java.lang.Boolean	valid           caches the result of the correctness test, once executed.

 

Fields inherited from class gnu.java.security.hash.BaseHash

blockSize, buffer, count, hashSize, name

 

Constructor Summary
	MD5()           Trivial 0-arguments constructor.
private	MD5(MD5 md)           Private constructor for cloning purposes.

 

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 i)           The block digest transformation per se.

 

Methods inherited from class gnu.java.security.hash.BaseHash

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

 

Methods inherited from class java.lang.Object

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

 

Field Detail

BLOCK_SIZE

private static final int BLOCK_SIZE

See Also:

Constant Field Values

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DIGEST0

private static final java.lang.String DIGEST0

See Also:

Constant Field Values

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valid

private static java.lang.Boolean valid

caches the result of the correctness test, once executed.

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h0

private int h0

128-bit interim result.

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h1

private int h1

128-bit interim result.

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h2

private int h2

128-bit interim result.

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h3

private int h3

128-bit interim result.

Constructor Detail

MD5

public MD5()

Trivial 0-arguments constructor.

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MD5

private MD5(MD5 md)

Private constructor for cloning purposes.

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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transform

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

Description copied from class: BaseHash

The block digest transformation per se.

Specified by:

transform in class BaseHash

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padBuffer

protected byte[] padBuffer()

Description copied from class: BaseHash

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

Specified by:

padBuffer 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

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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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Home >> All >> gnu >> java >> security >> [ hash overview ]	PREV CLASS  NEXT CLASS
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