ru.d_shap.hash

Class HashHelper

java.lang.Object

ru.d_shap.hash.HashHelper

public final class HashHelper
extends Object

Class to perform hash computations.

Author:

Dmitry Shapovalov

Method Summary

Modifier and Type	Method and Description
static void	addSalt(Hash hash, byte[] storedSalt, byte[] fixedSalt, SaltOrder saltOrder) Add the specified salt to the specified hash in the specified order.
static byte[]	addSaltBytes(byte[] hash, byte[] salt, SaltStoreType saltStoreType) Store the salt bytes in the result array of bytes along with the hash bytes.
static Hash	getHash(byte[] bytes, String algorithm) Create the hash object for the specified bytes.
static Hash	getHash(CharSequence charSequence, String algorithm) Create the hash object for the specified char sequence.
static Hash	getHash(CharSequence charSequence, String encoding, String algorithm) Create the hash object for the specified char sequence.
static Hash	getHash(InputStream stream, String algorithm) Create the hash object for the specified stream of bytes.
static byte[]	getHashBytes(byte[] bytes, SaltStoreType saltStoreType, int saltLength) Get the hash bytes from the the array of bytes.
static byte[]	getSaltBytes(byte[] bytes, SaltStoreType saltStoreType, int saltLength) Get the salt bytes from the the array of bytes.

Methods inherited from class java.lang.Object

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

Method Detail

getHash

public static Hash getHash(byte[] bytes,
                           String algorithm)

Create the hash object for the specified bytes.

Parameters:

bytes - the specified bytes.

algorithm - the hash algorithm.

Returns:

the hash object.

getHash

public static Hash getHash(CharSequence charSequence,
                           String algorithm)

Create the hash object for the specified char sequence.

Parameters:

charSequence - the specified char sequence.

algorithm - the hash algorithm.

Returns:

the hash object.

getHash

public static Hash getHash(CharSequence charSequence,
                           String encoding,
                           String algorithm)

Create the hash object for the specified char sequence.

Parameters:

charSequence - the specified char sequence.

encoding - the encoding of the char sequence.

algorithm - the hash algorithm.

Returns:

the hash object.

getHash

public static Hash getHash(InputStream stream,
                           String algorithm)

Create the hash object for the specified stream of bytes.

Parameters:

stream - the specified stream of bytes.

algorithm - the hash algorithm.

Returns:

the hash object.

addSalt

public static void addSalt(Hash hash,
                           byte[] storedSalt,
                           byte[] fixedSalt,
                           SaltOrder saltOrder)

Add the specified salt to the specified hash in the specified order.

Parameters:

hash - the hash object.

storedSalt - the stored salt.

fixedSalt - the fixed salt.

saltOrder - the stored salt and the fixed salt order.

addSaltBytes

public static byte[] addSaltBytes(byte[] hash,
                                  byte[] salt,
                                  SaltStoreType saltStoreType)

Store the salt bytes in the result array of bytes along with the hash bytes.

Parameters:

hash - the hash bytes.

salt - the salt bytes.

saltStoreType - how to store the salt bytes.

Returns:

the result array of bytes.

getHashBytes

public static byte[] getHashBytes(byte[] bytes,
                                  SaltStoreType saltStoreType,
                                  int saltLength)

Get the hash bytes from the the array of bytes.

Parameters:

bytes - the array of bytes.

saltStoreType - how the salt bytes are stored.

saltLength - the number of the salt bytes.

Returns:

the hash bytes.

getSaltBytes

public static byte[] getSaltBytes(byte[] bytes,
                                  SaltStoreType saltStoreType,
                                  int saltLength)

Get the salt bytes from the the array of bytes.

Parameters:

bytes - the array of bytes.

saltStoreType - how the salt bytes are stored.

saltLength - the number of the salt bytes.

Returns:

the salt bytes.