org.bouncycastle.crypto.generators
Class RSABlindingFactorGenerator

java.lang.Object
  org.bouncycastle.crypto.generators.RSABlindingFactorGenerator

public class RSABlindingFactorGenerator
extends java.lang.Object

Generate a random factor suitable for use with RSA blind signatures as outlined in Chaum's blinding and unblinding as outlined in "Handbook of Applied Cryptography", page 475.

Field Summary

private RSAKeyParameters	key
private static java.math.BigInteger	ONE
private java.security.SecureRandom	random
private static java.math.BigInteger	ZERO

Constructor Summary

RSABlindingFactorGenerator()

Method Summary

java.math.BigInteger	generateBlindingFactor() Generate a suitable blind factor for the public key the generator was initialised with.
void	init(CipherParameters param) Initialise the factor generator

Methods inherited from class java.lang.Object

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

Field Detail

ZERO

private static java.math.BigInteger ZERO

ONE

private static java.math.BigInteger ONE

key

private RSAKeyParameters key

random

private java.security.SecureRandom random

Constructor Detail

RSABlindingFactorGenerator

public RSABlindingFactorGenerator()

Method Detail

init

public void init(CipherParameters param)

Initialise the factor generator

Parameters:

param - the necessary RSA key parameters.

generateBlindingFactor

public java.math.BigInteger generateBlindingFactor()

Generate a suitable blind factor for the public key the generator was initialised with.

Returns:

a random blind factor