cz.d1x.dxcrypto.hash

Class SaltingAdapter

java.lang.Object

cz.d1x.dxcrypto.hash.SaltingAdapter

public class SaltingAdapter
extends Object

Adapter for hashing algorithms that combines input text and salt before it is processed by adapted algorithm. For combination, you can implement your own CombineAlgorithm or you can use default one.

Example:

     HashingAlgorithm sha256 = new SHA256();
     SaltingAdapter adapter = new SaltingAdapter(alg); // ConcatCombineAlgorithm
     adapter.hash("your input text", "your salt");

     // or with custom combine algorithm
     CombineAlgorithm combineAlg = ...; // your implementation
     SaltingAdapter adapter = new SaltingAdapter(alg, combineAlg); // ConcatCombineAlgorithm
 

Be sure to store the salt along with the hash for future checks.

Author:

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

See Also:

ConcatCombineAlgorithm

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SaltingAdapter(HashingAlgorithm hashingAlgorithm, CombineAlgorithm combineAlgorithm, String encoding) Creates a new salting adapter.

Method Summary

Modifier and Type	Method and Description
byte[]	hash(byte[] input, byte[] salt) Hashes given input with given salt using adapted hashing algorithm.
String	hash(String input, String salt) Hashes given input with given salt using adapted hashing algorithm.

Methods inherited from class java.lang.Object

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

Constructor Detail

SaltingAdapter

protected SaltingAdapter(HashingAlgorithm hashingAlgorithm,
                         CombineAlgorithm combineAlgorithm,
                         String encoding)

Creates a new salting adapter.

Parameters:

hashingAlgorithm - algorithm for hashing

combineAlgorithm - strategy how to combine input text and salt

encoding - encoding for used strings

Method Detail

hash

public String hash(String input,
                   String salt)
            throws HashingException

Hashes given input with given salt using adapted hashing algorithm.

Parameters:

input - input to be hashed

salt - salt to be added to input

Returns:

hashed input

Throws:

HashingException - possible exception during hashing

hash

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

Hashes given input with given salt using adapted hashing algorithm.

Parameters:

input - input to be hashed

salt - salt to be added to input

Returns:

hashed input

Throws:

HashingException - possible exception during hashing