org.bouncycastle.crypto.util

Class JournalingSecureRandom

java.lang.Object

java.util.Random

java.security.SecureRandom

org.bouncycastle.crypto.util.JournalingSecureRandom

All Implemented Interfaces:

java.io.Serializable

public class JournalingSecureRandom
extends java.security.SecureRandom

A SecureRandom that maintains a journal of its output.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
JournalingSecureRandom(byte[] transcript, java.security.SecureRandom random) Constructor with a prior transcript.
JournalingSecureRandom(java.security.SecureRandom random) Base constructor - no prior transcript.

Method Summary

Modifier and Type	Method and Description
void	clear() Clear the internals
byte[]	getTranscript() Return the transcript so far,
void	nextBytes(byte[] bytes) Fill bytes with random data, journaling the random data before returning.

Methods inherited from class java.security.SecureRandom

generateSeed, getAlgorithm, getInstance, getInstance, getInstance, getInstanceStrong, getProvider, getSeed, next, setSeed, setSeed

Methods inherited from class java.util.Random

doubles, doubles, doubles, doubles, ints, ints, ints, ints, longs, longs, longs, longs, nextBoolean, nextDouble, nextFloat, nextGaussian, nextInt, nextInt, nextLong

Methods inherited from class java.lang.Object

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

Constructor Detail

JournalingSecureRandom

public JournalingSecureRandom(java.security.SecureRandom random)

Base constructor - no prior transcript.

Parameters:

random - source of randomness we will be journaling.

JournalingSecureRandom

public JournalingSecureRandom(byte[] transcript,
                              java.security.SecureRandom random)

Constructor with a prior transcript. Both the transcript used and any new randomness are journaled.

Parameters:

transcript - initial transcript of randomness.

random - source of randomness we will be journaling when the transcript runs out.

Method Detail

nextBytes

public final void nextBytes(byte[] bytes)

Fill bytes with random data, journaling the random data before returning.

Overrides:

nextBytes in class java.security.SecureRandom

Parameters:

bytes - a block of bytes to be filled with random data.

clear

public void clear()

Clear the internals

getTranscript

public byte[] getTranscript()

Return the transcript so far,

Returns:

a copy of the randomness produced so far.