net.vattp.security
Class TimerJitterEntropy

java.lang.Object
  |
  +--java.lang.Thread
        |
        +--net.vattp.security.TimerJitterEntropy

All Implemented Interfaces:

Runnable

class TimerJitterEntropy

extends Thread

Use clock phase differences between 2 PC clocks to generate entropy.

This class provides a cryptographically strong random number generator based on user provided sources of entropy and the MD5 hash algorithm. It maintains an estimate of the amount of entropy supplied. If there is a request for secure random data, a call on nextBytes(), when there is less than 80 bits of randomness available, it will use super.getSeed() to bring the level up to 80 bits.

The calls inherited from Random and SecureRandom are implemented in terms of the strengthened functionality.

Author:

Bill Frantz

See Also:

java.util.Random, java.security.SecureRandom

Field Summary

private boolean

theIsStarted

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

TimerJitterEntropy(String name)

Method Summary

boolean	isStarted()
void	run() Enabled: If this thread was constructed using a separate Runnable run object, then that Runnable object's run method is called; otherwise, this method does nothing and returns.

Methods inherited from class java.lang.Thread

activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getContextClassLoader, getName, getPriority, getThreadGroup, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setName, setPriority, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

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

Field Detail

theIsStarted

private boolean theIsStarted

Constructor Detail

TimerJitterEntropy

public TimerJitterEntropy(String name)

Method Detail

isStarted

public boolean isStarted()

run

public final void run()

Description copied from class: Thread

Enabled: If this thread was constructed using a separate Runnable run object, then that Runnable object's run method is called; otherwise, this method does nothing and returns.

Subclasses of Thread should override this method.

Specified by:

run in interface Runnable

Overrides:

run in class Thread

See Also:

java.lang.Thread#start(), java.lang.Thread#stop(), java.lang.Thread#Thread(java.lang.ThreadGroup, java.lang.Runnable, java.lang.String), java.lang.Runnable#run()