org.spongycastle.crypto.prng

Class DigestRandomGenerator

java.lang.Object

org.spongycastle.crypto.prng.DigestRandomGenerator

All Implemented Interfaces:

RandomGenerator

public class DigestRandomGenerator
extends java.lang.Object
implements RandomGenerator

Random generation based on the digest with counter. Calling addSeedMaterial will always increase the entropy of the hash.

Internal access to the digest is synchronized so a single one of these can be shared.

Constructor Summary

Constructors

Constructor and Description
DigestRandomGenerator(Digest digest)

Method Summary

Modifier and Type	Method and Description
void	addSeedMaterial(byte[] inSeed) Add more seed material to the generator.
void	addSeedMaterial(long rSeed) 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

DigestRandomGenerator

public DigestRandomGenerator(Digest digest)

Method Detail

addSeedMaterial

public void addSeedMaterial(byte[] inSeed)

Description copied from interface: RandomGenerator

Add more seed material to the generator.

Specified by:

addSeedMaterial in interface RandomGenerator

Parameters:

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

addSeedMaterial

public void addSeedMaterial(long rSeed)

Description copied from interface: RandomGenerator

Add more seed material to the generator.

Specified by:

addSeedMaterial in interface RandomGenerator

Parameters:

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

nextBytes

public void nextBytes(byte[] bytes)

Description copied from interface: RandomGenerator

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)

Description copied from interface: RandomGenerator

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.