cz.d1x.dxcrypto.hash

Class RepeatingDecorator

java.lang.Object

cz.d1x.dxcrypto.hash.RepeatingDecorator

All Implemented Interfaces:

HashingAlgorithm

public final class RepeatingDecorator
extends Object
implements HashingAlgorithm

Decorator for hashing algorithms which repeats hashing multiple times. E.g. 3 repeats results in hash(hash(hash(input)))

Example:

     HashingAlgorithm sha256 = new SHA256();
     HashingAlgorithm decorator = new RepeatingDecorator(alg, 27);
     decorator.hash("whateverYouWant");
 

Author:

Zdenek Obst, zdenek.obst-at-gmail.com

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	RepeatingDecorator(HashingAlgorithm hashingAlgorithm, int repeatsCount) Creates a new repeating decorator with specified algorithm a repeats count.

Method Summary

Modifier and Type	Method and Description
byte[]	hash(byte[] input) Creates a hash from input bytes.
String	hash(String input) Creates a hash from input text.

Methods inherited from class java.lang.Object

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

Constructor Detail

RepeatingDecorator

protected RepeatingDecorator(HashingAlgorithm hashingAlgorithm,
                             int repeatsCount)

Creates a new repeating decorator with specified algorithm a repeats count.

Parameters:

hashingAlgorithm - algorithm to be repeated

repeatsCount - number of repeats of hashing

Method Detail

hash

public String hash(String input)
            throws HashingException

Creates a hash from input text.

Repeats algorithm by specified number of times.

Specified by:

hash in interface HashingAlgorithm

Parameters:

input - input text to be hashed

Returns:

hashed text in hex string

Throws:

HashingException - possible exception during hashing process

hash

public byte[] hash(byte[] input)
            throws HashingException

Creates a hash from input bytes.

Repeats algorithm by specified number of times.

Specified by:

hash in interface HashingAlgorithm

Parameters:

input - input to be hashed

Returns:

hashed text in input

Throws:

HashingException - possible exception during hashing process