org.spongycastle.crypto.prng

Class X931SecureRandomBuilder

java.lang.Object

org.spongycastle.crypto.prng.X931SecureRandomBuilder

public class X931SecureRandomBuilder
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
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

Modifier and Type	Method and Description
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.