org.ow2.jonas.security.internal.realm.lib
Class HashHelper

java.lang.Object
  org.ow2.jonas.security.internal.realm.lib.HashHelper

public class HashHelper
extends Object

Methods to hash Strings. All the methods in here are static so HashHelper should never be instantiated.

Author:

Andy Armstrong, andy@tagish.com , Yann Petiot for the modifications, Florent Benoit modifications for integration in JOnAS

Field Summary

static String

DEFAULT_ALGO The default algorithm

Method Summary

static org.ow2.jonas.security.realm.lib.HashPassword	getHashPassword(String password) Return the haspassword object from a string.
static String	hashPassword(char[] pwd) Performs the default algorithm hashing on the supplied password and return a char array containing the password as a printable string.
static String	hashPassword(char[] pwd, String algo) Performs an algorithm specified by the user hashing on the supplied password and return a char array containing the encrypted password as a printable string.
static String	hashPassword(String string, String algo) Performs an algorithm specified by the user hashing on the supplied password and return a char array containing the encrypted password as a printable string.
static char[]	hexDump(byte[] src) Turn a byte array into a char array containing a printable hex representation of the bytes.
static void	smudge(byte[] pwd) Zero the contents of the specified array.
static void	smudge(char[] pwd) Zero the contents of the specified array.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_ALGO

public static final String DEFAULT_ALGO

The default algorithm

See Also:

Constant Field Values

Method Detail

getHashPassword

public static org.ow2.jonas.security.realm.lib.HashPassword getHashPassword(String password)

Return the haspassword object from a string. It extracts algorithm and password from the string

Parameters:

password - contain password and algorithm

Returns:

the haspassword object

hexDump

public static char[] hexDump(byte[] src)

Turn a byte array into a char array containing a printable hex representation of the bytes. Each byte in the source array contributes a pair of hex digits to the output array.

Parameters:

src - the source array

Returns:

a char array containing a printable version of the source data

smudge

public static void smudge(char[] pwd)

Zero the contents of the specified array. Typically used to erase temporary storage that has held plaintext passwords so that we don't leave them lying around in memory.

Parameters:

pwd - the array to zero

smudge

public static void smudge(byte[] pwd)

Zero the contents of the specified array.

Parameters:

pwd - the array to zero

hashPassword

public static String hashPassword(char[] pwd)
                           throws NoSuchAlgorithmException

Performs the default algorithm hashing on the supplied password and return a char array containing the password as a printable string. The hash is computed on the low 8 bits of each character.

Parameters:

pwd - The password to hash

Returns:

a string representation of the hash password

Throws:

NoSuchAlgorithmException - if this is not a valid algorithm

hashPassword

public static String hashPassword(char[] pwd,
                                  String algo)
                           throws NoSuchAlgorithmException

Performs an algorithm specified by the user hashing on the supplied password and return a char array containing the encrypted password as a printable string. The hash is computed on the low 8 bits of each character.

Parameters:

pwd - The password to hash

algo - The type of Message Digest Algorithms

Returns:

a string representation of the hash password

Throws:

NoSuchAlgorithmException - if the algorithm can not be found

hashPassword

public static String hashPassword(String string,
                                  String algo)
                           throws NoSuchAlgorithmException

Performs an algorithm specified by the user hashing on the supplied password and return a char array containing the encrypted password as a printable string. The hash is computed on the low 8 bits of each character.

Parameters:

string - The password to hash

algo - The type of Message Digest Algorithms

Returns:

a string representation of the hash password

Throws:

NoSuchAlgorithmException - if the algorithm can not be found