org.bouncycastle.crypto.generators
Class NaccacheSternKeyPairGenerator

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

All Implemented Interfaces:

AsymmetricCipherKeyPairGenerator

public class NaccacheSternKeyPairGenerator
extends java.lang.Object
implements AsymmetricCipherKeyPairGenerator

Key generation parameters for NaccacheStern cipher. For details on this cipher, please see http://www.gemplus.com/smart/rd/publications/pdf/NS98pkcs.pdf

Field Summary

private static java.math.BigInteger	ONE
private NaccacheSternKeyGenerationParameters	param
private static int[]	smallPrimes

Constructor Summary

NaccacheSternKeyPairGenerator()

Method Summary

private static java.util.Vector	findFirstPrimes(int count) Finds the first 'count' primes starting with 3
AsymmetricCipherKeyPair	generateKeyPair() return an AsymmetricCipherKeyPair containing the generated keys.
private static java.math.BigInteger	generatePrime(int bitLength, int certainty, java.security.SecureRandom rand)
private static int	getInt(java.security.SecureRandom rand, int n)
void	init(KeyGenerationParameters param) intialise the key pair generator.
private static java.util.Vector	permuteList(java.util.Vector arr, java.security.SecureRandom rand) Generates a permuted ArrayList from the original one.

Methods inherited from class java.lang.Object

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

Field Detail

smallPrimes

private static int[] smallPrimes

param

private NaccacheSternKeyGenerationParameters param

ONE

private static final java.math.BigInteger ONE

Constructor Detail

NaccacheSternKeyPairGenerator

public NaccacheSternKeyPairGenerator()

Method Detail

init

public void init(KeyGenerationParameters param)

Description copied from interface: AsymmetricCipherKeyPairGenerator

intialise the key pair generator.

Specified by:

init in interface AsymmetricCipherKeyPairGenerator

Parameters:

param - the parameters the key pair is to be initialised with.

generateKeyPair

public AsymmetricCipherKeyPair generateKeyPair()

Description copied from interface: AsymmetricCipherKeyPairGenerator

return an AsymmetricCipherKeyPair containing the generated keys.

Specified by:

generateKeyPair in interface AsymmetricCipherKeyPairGenerator

Returns:

an AsymmetricCipherKeyPair containing the generated keys.

generatePrime

private static java.math.BigInteger generatePrime(int bitLength,
                                                  int certainty,
                                                  java.security.SecureRandom rand)

permuteList

private static java.util.Vector permuteList(java.util.Vector arr,
                                            java.security.SecureRandom rand)

Generates a permuted ArrayList from the original one. The original List is not modified

Parameters:

arr - the ArrayList to be permuted

rand - the source of Randomness for permutation

Returns:

a new ArrayList with the permuted elements.

getInt

private static int getInt(java.security.SecureRandom rand,
                          int n)

findFirstPrimes

private static java.util.Vector findFirstPrimes(int count)

Finds the first 'count' primes starting with 3

Parameters:

count - the number of primes to find

Returns:

a vector containing the found primes as Integer