gnu.crypto.prng
Class MDGenerator

java.lang.Object
  gnu.crypto.prng.BasePRNG
      gnu.crypto.prng.MDGenerator

All Implemented Interfaces:

java.lang.Cloneable, IRandom

public class MDGenerator

extends BasePRNG

A simple pseudo-random number generator that relies on a hash algorithm, that (a) starts its operation by hashing a seed, and then (b) continuously re-hashing its output. If no hash algorithm name is specified in the Map of attributes used to initialise the instance then the SHA-160 algorithm is used as the underlying hash function. Also, if no seed is given, an empty octet sequence is used.

Version:

$Revision: 1.2 $

Field Summary

static java.lang.String	MD_NAME Property name of underlying hash algorithm for this generator.
static java.lang.String	SEEED Property name of seed material.

Fields inherited from class gnu.crypto.prng.BasePRNG

buffer, initialised, name, ndx

Constructor Summary

MDGenerator()
Trivial 0-arguments constructor.

Method Summary

java.lang.Object	clone() Returns a clone copy of this instance.
void	fillBlock()
void	setup(java.util.Map attributes)

Methods inherited from class gnu.crypto.prng.BasePRNG

init, isInitialised, name, nextByte, nextBytes

Methods inherited from class java.lang.Object

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

Field Detail

MD_NAME

public static final java.lang.String MD_NAME

Property name of underlying hash algorithm for this generator.

See Also:

Constant Field Values

SEEED

public static final java.lang.String SEEED

Property name of seed material.

See Also:

Constant Field Values

Constructor Detail

MDGenerator

public MDGenerator()

Trivial 0-arguments constructor.

Method Detail

clone

public java.lang.Object clone()

Description copied from interface: IRandom

Returns a clone copy of this instance.

Specified by:

clone in interface IRandom

Specified by:

clone in class BasePRNG

setup

public void setup(java.util.Map attributes)

Specified by:

setup in class BasePRNG

fillBlock

public void fillBlock()
               throws LimitReachedException

Specified by:

fillBlock in class BasePRNG

Throws:

LimitReachedException