org.paulneve.wlab.utilities
Class DesEncrypter

java.lang.Object
  org.paulneve.wlab.utilities.DesEncrypter

public class DesEncrypter
extends java.lang.Object

Encrypts/Decrypts strings with DES. Mostly nabbed from http://www.exampledepot.com/egs/javax.crypto/PassKey.html

The key used is hard coded, so we are not exactly stretching the boundaries of cryptography here. The intent is simply to obscufate the HTML and particularly the VNC applet parameter values to prevent students from getting details of the internal network, default VNC passwords, etc. There is a corresponding version of this over in the TightVNC hacked version that decodes the parameters.

Field Summary

(package private) javax.crypto.Cipher	dcipher
(package private) javax.crypto.Cipher	ecipher
(package private) int	iterationCount
(package private) byte[]	salt

Constructor Summary

DesEncrypter(java.lang.String passPhrase)
Creates a new encrypter object, with the supplied passPhrase.

Method Summary

java.lang.String	decrypt(java.lang.String str) Descrypts a string
java.lang.String	encrypt(java.lang.String str) Encrypts a string

Methods inherited from class java.lang.Object

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

Field Detail

ecipher

javax.crypto.Cipher ecipher

dcipher

javax.crypto.Cipher dcipher

salt

byte[] salt

iterationCount

int iterationCount

Constructor Detail

DesEncrypter

public DesEncrypter(java.lang.String passPhrase)

Creates a new encrypter object, with the supplied passPhrase.

Parameters:

passPhrase - a string

Method Detail

encrypt

public java.lang.String encrypt(java.lang.String str)

Encrypts a string

Parameters:

str - string to encrypt

Returns:

an ecrypted string

decrypt

public java.lang.String decrypt(java.lang.String str)

Descrypts a string

Parameters:

str - string to decrypt

Returns:

decrypted string