org.bibalex.daf.installer
Class Cryptography

java.lang.Object
  org.bibalex.daf.installer.Cryptography

public class Cryptography
extends java.lang.Object

Copyright (c) 2006-2007 by Bibliotheca Alexandrina This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. This class provides a wrapping for the Encryption and Decryption functionalities.

Author:

Ramy.Nagah Currently it only supports one embededd encrption algorithm "PBEWithMD5AndDES", but it can be modified to support multi encrption algoritms or added providers.

Field Summary

private javax.crypto.Cipher	c The Ciphering instance used in encryption and decryption
private static char[]	hexChar The hexadecimal characters in an array to be used in converions from string to hexadecimals, and in validations.
private javax.crypto.SecretKey	key The SecretKey instance used in encryption and decryption (generated) from the password and the SALT
private javax.crypto.spec.PBEParameterSpec	paramSpec

Constructor Summary

Cryptography(java.lang.String strPassword, java.lang.String strSalt)
Constructor.

Method Summary

java.lang.String	Decrypt(java.lang.String strValue) Decrypts the given strValue using the instantiated object of Password and Salt
java.lang.String	Encrypt(java.lang.String strValue) Encrypts the given strValue using the instantiated object of Password and Salt
protected static byte[]	toBinArray(java.lang.String hexStr) Converts a Hexadecimal String into a binary array.
protected static java.lang.String	toHexString(byte[] b) Converts a String to its equivalent Hexadecimal representation.

Methods inherited from class java.lang.Object

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

Field Detail

hexChar

private static final char[] hexChar

The hexadecimal characters in an array to be used in converions from string to hexadecimals, and in validations.

c

private javax.crypto.Cipher c

The Ciphering instance used in encryption and decryption

key

private javax.crypto.SecretKey key

The SecretKey instance used in encryption and decryption (generated) from the password and the SALT

paramSpec

private javax.crypto.spec.PBEParameterSpec paramSpec

Constructor Detail

Cryptography

public Cryptography(java.lang.String strPassword,
                    java.lang.String strSalt)
             throws java.lang.Exception

Constructor. This class has to be initialized to be able to either Encrypt or Decrypt.

Parameters:

strPassword - Password used in creating the SecretKey.

strSalt - the Salt used in in creating the SecretKey.

Throws:

java.lang.Exception

Method Detail

Encrypt

public java.lang.String Encrypt(java.lang.String strValue)
                         throws java.lang.Exception

Encrypts the given strValue using the instantiated object of Password and Salt

Parameters:

strValue - the value to Encrypt

Returns:

the encrpted String

Throws:

java.lang.Exception

Decrypt

public java.lang.String Decrypt(java.lang.String strValue)
                         throws java.lang.Exception

Decrypts the given strValue using the instantiated object of Password and Salt

Parameters:

strValue - the value to Decrypt

Returns:

the decrpted String

Throws:

java.lang.Exception

toHexString

protected static java.lang.String toHexString(byte[] b)

Converts a String to its equivalent Hexadecimal representation.

Parameters:

b - the byte[] to be converted into Hexadecimal String

Returns:

The Hexadecimal representation.

toBinArray

protected static byte[] toBinArray(java.lang.String hexStr)

Converts a Hexadecimal String into a binary array.

Parameters:

hexStr - The Hexadecimal String to be converted.

Returns:

a byte[] representing the binary array.