com.entrust.toolkit.security.provider

Class X917Random

java.lang.Object

java.util.Random

java.security.SecureRandom

iaik.security.random.SecRandom

com.entrust.toolkit.security.provider.X917Random

All Implemented Interfaces:

java.io.Serializable

Deprecated.

since 7.0; use X9_31using3DES instead

public class X917Random
extends SecRandom

This class implements a secure pseudorandom number generator based strictly on ANSI X9.17. The X9.17 was specified for the generation of DES initialization vectors and consequently uses a seed of only 64 bits. In addition to the seed, X9.17 defines that it shall use the current system time. That means, if you generate two instances of X917Random, each will output a different pseudo random sequence, even if you specified the same seed. If the method setSeed(byte[] seed) of the base class SecRandom is not explicitly called by the user, it automatically generated a seed with the default SeedGenerator set in the SeedGenerator.getDefault().getSeed(). Also, when an attempt is made to reseed this object, the given seed supplements rather than replaces the existing seed.

See Also:

Serialized Form

Field Summary

Fields inherited from class iaik.security.random.SecRandom

m_sync, seeded

Constructor Summary

Constructors

Constructor and Description
X917Random() Deprecated. Generates a new X917Random1 object.

Method Summary

Modifier and Type	Method and Description
protected byte[]	engineGenerateSeed(int numBytes) Deprecated. Generates a cryptographically strong seed of any length.
protected void	engineNextBytes(byte[] bytes) Deprecated. Returns the next bytes.length pseudo-random bytes.
protected void	engineSetSeed(byte[] seed) Deprecated. Reseeds this random object.

Methods inherited from class iaik.security.random.SecRandom

getDefault, nextBytes, setDefault, setSeed, setSeed, setSeed

Methods inherited from class java.security.SecureRandom

generateSeed, getAlgorithm, getInstance, getInstance, getInstance, getInstanceStrong, getProvider, getSeed, next

Methods inherited from class java.util.Random

doubles, doubles, doubles, doubles, ints, ints, ints, ints, longs, longs, longs, longs, 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

X917Random

public X917Random()
           throws RandomException

Deprecated.

Generates a new X917Random1 object.

Throws:

RandomException

Method Detail

engineSetSeed

protected void engineSetSeed(byte[] seed)

Deprecated.

Reseeds this random object. The given seed supplements, rather than replaces, the existing seed. Thus, repeated calls are guaranteed never to reduce randomness. This function also initializes the internal state of this PRNG using the new seed.

Specified by:

engineSetSeed in class SecRandom

Parameters:

seed - the supplemental seed

engineNextBytes

protected void engineNextBytes(byte[] bytes)

Deprecated.

Returns the next bytes.length pseudo-random bytes. On the first time this method is called it always seeds the PRNG with a cryptographically strong seed. This ensures that the initial seed is always a stong seed.

Specified by:

engineNextBytes in class SecRandom

Parameters:

bytes - an array whose length specifies the number of bytes requested and will hold the returned pseudo-random bytes.

engineGenerateSeed

protected byte[] engineGenerateSeed(int numBytes)

Deprecated.

Generates a cryptographically strong seed of any length. The seed is created by concatenating multiple seeds generated from class 'com.entrust.toolkit.security.provider.SeedGenerator'.

Parameters:

numBytes - Number of seed bytes requested.