org.bouncycastle.crypto.prng

Class ReversedWindowGenerator

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.

Constructor Details

ReversedWindowGenerator

public ReversedWindowGenerator(RandomGenerator generator,
                               int windowSize)

Method Details

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.