org.bouncycastle.crypto.prng
Class ReversedWindowGenerator

java.lang.Object
  |
  +--org.bouncycastle.crypto.prng.ReversedWindowGenerator

All Implemented Interfaces:

RandomGenerator

public class ReversedWindowGenerator

extends java.lang.Object

implements RandomGenerator

Takes bytes generated by an underling RandomGenerator and reverses the order in each small window (of configurable size).

Access to internals is synchronized so a single one of these can be shared.

Constructor Summary

ReversedWindowGenerator(RandomGenerator generator, int windowSize)

Method Summary

void	addSeedMaterial(byte[] seed) Add more seed material to the generator.
void	addSeedMaterial(long seed) Add more seed material to the generator.
void	nextBytes(byte[] bytes) Fill bytes with random values.
void	nextBytes(byte[] bytes, int start, int len) Fill part of bytes with random values.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReversedWindowGenerator

public ReversedWindowGenerator(RandomGenerator generator,
                               int windowSize)

Method Detail

addSeedMaterial

public void addSeedMaterial(byte[] seed)

Add more seed material to the generator.

Specified by:

addSeedMaterial in interface RandomGenerator

Parameters:

seed - a byte array to be mixed into the generator's state.

addSeedMaterial

public void addSeedMaterial(long seed)

Add more seed material to the generator.

Specified by:

addSeedMaterial in interface RandomGenerator

Parameters:

seed - a long value to be mixed into the generator's state.

nextBytes

public void nextBytes(byte[] bytes)

Fill bytes with random values.

Specified by:

nextBytes in interface RandomGenerator

Parameters:

bytes - byte array to be filled.

nextBytes

public void nextBytes(byte[] bytes,
                      int start,
                      int len)

Fill part of bytes with random values.

Specified by:

nextBytes in interface RandomGenerator

Parameters:

bytes - byte array to be filled.

start - index to start filling at.

len - length of segment to fill.