j_waste.crypto
Class Blowfish

java.lang.Object
  j_waste.crypto.Blowfish

public class Blowfish

extends java.lang.Object

This class handles the Blowfish encryption and decryption.

Version:

0.1

Author:

Fredrik Hultin (frehul@users.sourceforge.net), Mattias Ek (matek@users.sourceforge.net)

Constructor Summary

Blowfish(byte[] sessionKey, byte[] ivEnc, byte[] ivDec, java.lang.String mode)
Constructs a new Blowfish object.

Method Summary

byte[]	decrypt(byte[] input) This method decrypts the specified array with the initialized session key and iv.
byte[]	decryptWPCBC(byte[] input) This method decryts the input array the same way as the PCBC decryption in waste.
byte[]	encrypt(byte[] input) This method encrypts the specified array with the initialized session key and iv.
byte[]	encryptWPCBC(byte[] input) This method encryts the input array the same way as the PCBC encryption in waste.
byte[]	generateKey(int keySize) This method generates a key with the specified key size.
static void	main(java.lang.String[] argv) This method will pad out the input array to a multiple of the Blowfish block size.

Methods inherited from class java.lang.Object

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

Constructor Detail

Blowfish

public Blowfish(byte[] sessionKey,
                byte[] ivEnc,
                byte[] ivDec,
                java.lang.String mode)

Constructs a new Blowfish object.

Parameters:

sessionKey - The session key to be used.

ivEnc - The initialization vector for encryption.

ivDec - The initialization vector for decryption.

mode - The mode of encryption. (i.e. CBC, PCBC, ECB, WPCBC (WPCBC is compatible with the errorenous PCBC mode in waste.))

Method Detail

encrypt

public byte[] encrypt(byte[] input)
               throws javax.crypto.IllegalBlockSizeException,
                      javax.crypto.BadPaddingException

This method encrypts the specified array with the initialized session key and iv.

Parameters:

input - The input array that will be encrypted.

Returns:

Returns the encrypted array.

Throws:

javax.crypto.IllegalBlockSizeException

javax.crypto.BadPaddingException

decrypt

public byte[] decrypt(byte[] input)
               throws javax.crypto.IllegalBlockSizeException,
                      javax.crypto.BadPaddingException

This method decrypts the specified array with the initialized session key and iv.

Parameters:

input - The input array that will be decrypted.

Returns:

Returns the decrypted array.

Throws:

javax.crypto.IllegalBlockSizeException

javax.crypto.BadPaddingException

generateKey

public byte[] generateKey(int keySize)

This method generates a key with the specified key size.

Parameters:

keySize - The size of the key to be generated.

Returns:

Returns the generated key.

encryptWPCBC

public byte[] encryptWPCBC(byte[] input)

This method encryts the input array the same way as the PCBC encryption in waste. This is however not the way PCBC is usually implemented.

Parameters:

input - the data to be encrypted. Must me a multiple of 8 bytes.

decryptWPCBC

public byte[] decryptWPCBC(byte[] input)

This method decryts the input array the same way as the PCBC decryption in waste. This is however not the way PCBC is usually implemented.

Parameters:

input - the data to be encrypted. Must me a multiple of 8 bytes.

main

public static void main(java.lang.String[] argv)

This method will pad out the input array to a multiple of the Blowfish block size.