gov.sandia.cognition.hash

Interface HashFunction

All Superinterfaces:

java.lang.Cloneable, CloneableSerializable, Evaluator<byte[],byte[]>, java.io.Serializable

All Known Implementing Classes:

AbstractHashFunction, Eva32Hash, Eva64Hash, FNV1a32Hash, FNV1a64Hash, MD5Hash, Murmur32Hash, Prime32Hash, Prime64Hash, SHA1Hash, SHA256Hash, SHA512Hash

public interface HashFunction
extends CloneableSerializable, Evaluator<byte[],byte[]>

A hash function maps an arbitrarily large input and maps it onto a finite-length output.

Since:

3.4.2

Author:

Kevin R. Dixon

Method Summary

Modifier and Type	Method and Description
byte[]	evaluate(byte[] input, byte[] seed) Evaluates the input byte array with the given seed.
void	evaluateInto(byte[] input, byte[] output) Evaluates the input into the given output
void	evaluateInto(byte[] input, byte[] output, byte[] seed) Evaluates the input into the given output
byte[]	getDefaultSeed() Gets the default seed for the hash function
int	length() Returns the number of bytes in the output hash code.

Methods inherited from interface gov.sandia.cognition.util.CloneableSerializable

clone

Methods inherited from interface gov.sandia.cognition.evaluator.Evaluator

evaluate

Method Detail

evaluate

byte[] evaluate(byte[] input,
                byte[] seed)

Evaluates the input byte array with the given seed.

Parameters:

input - Input array to hash into the output

seed - Seed to offset the input

Returns:

Hash code of the input with the given seed

evaluateInto

void evaluateInto(byte[] input,
                  byte[] output)

Evaluates the input into the given output

Parameters:

input - Input to compute the hash-function value of

output - Output to put the hash-function into

evaluateInto

void evaluateInto(byte[] input,
                  byte[] output,
                  byte[] seed)

Evaluates the input into the given output

Parameters:

input - Input to compute the hash-function value of

output - Output to put the hash-function into

seed - Seed to offset the hash code.

length

int length()

Returns the number of bytes in the output hash code.

Returns:

Number of bytes in the output hash code.

getDefaultSeed

byte[] getDefaultSeed()

Gets the default seed for the hash function

Returns:

Default seed for the hash algorithm