org.bouncycastle.crypto.prng
Class X931SecureRandomBuilder

java.lang.Object
  |
  +--org.bouncycastle.crypto.prng.X931SecureRandomBuilder

public class X931SecureRandomBuilder

extends java.lang.Object

Constructor Summary

X931SecureRandomBuilder()
Basic constructor, creates a builder using an EntropySourceProvider based on the default SecureRandom with predictionResistant set to false.

X931SecureRandomBuilder(EntropySourceProvider entropySourceProvider)
Create a builder which makes creates the SecureRandom objects from a specified entropy source provider.

X931SecureRandomBuilder(java.security.SecureRandom entropySource, boolean predictionResistant)
Construct a builder with an EntropySourceProvider based on the passed in SecureRandom and the passed in value for prediction resistance.

Method Summary

X931SecureRandom	build(BlockCipher engine, KeyParameter key, boolean predictionResistant) Construct a X9.31 secure random generator using the passed in engine and key.
X931SecureRandomBuilder	setDateTimeVector(byte[] dateTimeVector)

Methods inherited from class java.lang.Object

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

Constructor Detail

X931SecureRandomBuilder

public X931SecureRandomBuilder()

Basic constructor, creates a builder using an EntropySourceProvider based on the default SecureRandom with predictionResistant set to false.

Any SecureRandom created from a builder constructed like this will make use of input passed to SecureRandom.setSeed() if the default SecureRandom does for its generateSeed() call.

X931SecureRandomBuilder

public X931SecureRandomBuilder(java.security.SecureRandom entropySource,
                               boolean predictionResistant)

Construct a builder with an EntropySourceProvider based on the passed in SecureRandom and the passed in value for prediction resistance.

Any SecureRandom created from a builder constructed like this will make use of input passed to SecureRandom.setSeed() if the passed in SecureRandom does for its generateSeed() call.

Parameters:

entropySource -

predictionResistant -

X931SecureRandomBuilder

public X931SecureRandomBuilder(EntropySourceProvider entropySourceProvider)

Create a builder which makes creates the SecureRandom objects from a specified entropy source provider.

Note: If this constructor is used any calls to setSeed() in the resulting SecureRandom will be ignored.

Parameters:

entropySourceProvider - a provider of EntropySource objects.

Method Detail

setDateTimeVector

public X931SecureRandomBuilder setDateTimeVector(byte[] dateTimeVector)

build

public X931SecureRandom build(BlockCipher engine,
                              KeyParameter key,
                              boolean predictionResistant)

Construct a X9.31 secure random generator using the passed in engine and key. If predictionResistant is true the generator will be reseeded on each request.

Parameters:

engine - a block cipher to use as the operator.

key - the block cipher key to initialise engine with.

predictionResistant - true if engine to be reseeded on each use, false otherwise.

Returns:

a SecureRandom.