Package io.github.olyutorskii.aletojio.shrink

Class VnExtractor

java.lang.Object

io.github.olyutorskii.aletojio.shrink.VnExtractor

All Implemented Interfaces:

RndInt32

public class VnExtractor
extends Object
implements RndInt32

Von Neumann randomness extractor (whitening).

Crunching input data by an average of 50% and improve output data randomness bias.

• ...00... → ×
• ...01... → 0
• ...10... → 1
• ...11... → ×

Random number output throughput decreases half.

See Also:

• Basic von Neumann extractor (Wikipedia)
• Self-shrinking generator (Wikipedia)

Constructor Summary

Constructors

Constructor	Description
VnExtractor(RndInt32 rnd)	Constructor.

Method Summary

Modifier and Type	Method	Description
int	nextInt32()	Return next random number as 32bit int with random sign-bit.

Methods inherited from class java.lang.Object

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

Constructor Details

VnExtractor

public VnExtractor(RndInt32 rnd)
            throws NullPointerException

Constructor.

Parameters:

rnd - random generator

Throws:

NullPointerException - null argument

Method Details

nextInt32

public int nextInt32()

Return next random number as 32bit int with random sign-bit.

Specified by:

nextInt32 in interface RndInt32

Returns:

random number