com.jcorporate.expresso.core.security.strongencryption
Class RandomNumber

java.lang.Object
  com.jcorporate.expresso.core.security.AbstractRandomNumber
      com.jcorporate.expresso.core.security.strongencryption.RandomNumber

public final class RandomNumber

extends AbstractRandomNumber

Cryptographically Strong Version of the random number generator. Due to the seeding process, the constructor for this class will take a significant amount of time to initialize.

Author:

Michael Rimov

Constructor Summary

RandomNumber()
Default Constructor

Method Summary

byte[]	getRandomBytes(int numBytes) getRandomBytes - Returns a byte array of random bytes.
void	init() To save some time, we use the last seed generated from a file instead of loading from scratch

Methods inherited from class com.jcorporate.expresso.core.security.AbstractRandomNumber

getCryptoManager, setCryptoManager

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomNumber

public RandomNumber()
             throws ChainedException

Default Constructor

Throws:

ChainedException - if unable to instantiate the SHA1 Random number generator

Method Detail

init

public void init()
          throws ChainedException

To save some time, we use the last seed generated from a file instead of loading from scratch

Overrides:

init in class AbstractRandomNumber

Throws:

NoSuchAlgorithmException - if we cannot find the SHA1PRNG

ChainedException

getRandomBytes

public byte[] getRandomBytes(int numBytes)

getRandomBytes - Returns a byte array of random bytes. The derived class determines the actual method used for getting the random data.

Specified by:

getRandomBytes in class AbstractRandomNumber

Parameters:

numBytes - The number of bytes to retrieve

Returns:

An array of random bytes