iaik.security.random

Class AnsiRandom

java.lang.Object

java.util.Random

java.security.SecureRandom

iaik.security.random.SecRandom

iaik.security.random.AnsiRandom

All Implemented Interfaces:

java.io.Serializable

public class AnsiRandom
extends SecRandom

This class implements a secure pseudo-random generator as specified in ANSI X9.17. It was specified for the generation of DES initialization vectors, and consequently uses a seed of only 64 bits. Therefore, it cannot be recommended for general use. Because Triple DES is used to generate the output, the IAIK provider must be installed.

In addition to the seed, X9.17 defines that it shall use the current system time. That means, if you generate two instances of AnsiRandom, they will output a different pseudo random sequence even if you specified the same seed. A setI() method is defined to allow modification of that second seed value.

Version:

File Revision 21

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
AnsiRandom() Generate a new AnsiRandom with the specified seed.

Method Summary

Methods

Modifier and Type	Method and Description
void	setI() Set the I vector to the current time.
void	setI(long time) Set the I vector to the specified long.

Methods inherited from class iaik.security.random.SecRandom

getAlgorithm, getDefault, setDefault, setDefault, setSeed

Methods inherited from class java.security.SecureRandom

generateSeed, getInstance, getInstance, getInstance, getProvider, getSeed, next, nextBytes, setSeed, setSeed

Methods inherited from class java.util.Random

nextBoolean, nextDouble, nextFloat, nextGaussian, nextInt, nextInt, nextLong

Methods inherited from class java.lang.Object

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

Constructor Detail

AnsiRandom

public AnsiRandom()
           throws RandomException

Generate a new AnsiRandom with the specified seed. The seed must be at least eight bytes long, other bytes are ignored. The IAIK provider must be installed with Triple DES, otherwise a RandomException will be thrown.

Throws:

RandomException

Method Detail

setI

public void setI()

Set the I vector to the current time.

setI

public void setI(long time)

Set the I vector to the specified long. The I vector is a second seed value used in number generation.