Package com.github.alex1304.jdash.util.robtopsweakcrypto

Class XORCipher

java.lang.Object

com.github.alex1304.jdash.util.robtopsweakcrypto.XORCipher

public class XORCipher
extends Object

Implementation of the XOR Cipher algorithm. It's done by performing cyclically a XOR operation on the ASCII code of each character between the message and a key. See https://en.wikipedia.org/wiki/XOR_cipher

Constructor Summary

Constructors

Constructor	Description
XORCipher(String key)	Constructs a new XORCipher with a provided key

Method Summary

Modifier and Type	Method	Description
String	cipher(String message)	Ciphers the message using the key provided on the object instanciation.
static String	findKey(String messagePlain, String messageCipher)	Retrieves the key by performing a XOR cipher between the plaintext message and the ciphered message.

Methods inherited from class java.lang.Object

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

Constructor Detail

XORCipher

public XORCipher(String key)

Constructs a new XORCipher with a provided key

Parameters:

key - - the key

Throws:

IllegalArgumentException - if the key is an empty string or null

Method Detail

cipher

public String cipher(String message)

Ciphers the message using the key provided on the object instanciation.

Parameters:

message - - the message to cipher

Returns:

the ciphered message as String

findKey

public static String findKey(String messagePlain,
                             String messageCipher)

Retrieves the key by performing a XOR cipher between the plaintext message and the ciphered message. It's strongly recommended to ensure that both parameters have the same length, or else the key might not be the one expected.

Parameters:

messagePlain - - the plaintext message

messageCipher - - the ciphered message

Returns:

the shortest possible key as String

Throws:

IllegalArgumentException - if one of the parameters are empty strings or null