de.flexiprovider.ec
Class ECPRNG

java.lang.Object
  |
  +--java.security.SecureRandomSpi
        |
        +--de.flexiprovider.api.SecureRandom
              |
              +--de.flexiprovider.ec.ECPRNG

All Implemented Interfaces:

java.io.Serializable

public class ECPRNG

extends SecureRandom

This class implements a pseudorandom number generator as proposed by Kaliski. Its security bases on the elliptic curve discrete logarithm problem. For details, we refer to the ICICS 2002 paper of H. Baier. The curve parameters are stored in a file named 'curve_parameters'. This file has to be stored in the same directory as the Java-class containing the main(...)-method . The validity of the parameters is not checked!!! Thus the user is responsible for a good choice.

Author:

Harald Baier

See Also:

EllipticCurveGFP, Serialized Form

Field Summary

(package private) static long

counter Computes the required random bytes.

Constructor Summary

ECPRNG()
Constructor.

Method Summary

byte[]	generateSeed(int numBytes) Generate a seed of the given length.
void	nextBytes(byte[] randomBytes)
void	setSeed(byte[] seed) Sets the seed to the given argument.

Methods inherited from class de.flexiprovider.api.SecureRandom

engineGenerateSeed, engineNextBytes, engineSetSeed, nextInt, nextInt

Methods inherited from class java.lang.Object

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

Field Detail

counter

static long counter

Computes the required random bytes.

Constructor Detail

ECPRNG

public ECPRNG()
       throws InvalidPointException

Constructor.

Throws:

InvalidPointException - should not happen with the default parameters.

Method Detail

generateSeed

public byte[] generateSeed(int numBytes)

Generate a seed of the given length.

Overrides:

generateSeed in class SecureRandom

Parameters:

numBytes - - the intended number of seed bytes

Returns:

the seed as array of bytes

setSeed

public void setSeed(byte[] seed)

Sets the seed to the given argument.

Overrides:

setSeed in class SecureRandom

Parameters:

seed - - the seed

nextBytes

public void nextBytes(byte[] randomBytes)

Overrides:

nextBytes in class SecureRandom