/* Copyright (c) 2003 Jan-Klaas Kollhof This file is part of the JavaScript o lait library(jsolait). jsolait is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This software 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this software; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /** Cryptography module. Provides String encryption/decryption and hashing. */ Module("crypto", "0.1.2", function(mod){ /** Returns all all available encrypters. @return An array of encrypters names. */ mod.listEncrypters=function(){ var c=[]; for(var attr in String.prototype){ if(attr.slice(0, 8) == "encrypt_"){ c.push(attr.slice(8)); } } return c; } /** Returns all all available decrypters. @return An array of decrypters names. */ mod.listDecrypters=function(){ var c=[]; for(var attr in String.prototype){ if(attr.slice(0, 8) == "decrypt_"){ c.push(attr.slice(8)); } } return c; } /** Encrypts a string. Parameters but the crypdec parameter are forwardet to the crypdec. @param codec The codec to use. */ String.prototype.encrypt=function(crydec){ var n = "encrypt_" + crydec; if(String.prototype[n]){ var args=[]; for(var i=1;i<arguments.length;i++){ args[i-1] = arguments[i]; } return String.prototype[n].apply(this, args); }else{ throw new mod.Exception("Decrypter '%s' not found.".format(crydec)); } } /** Decrypts a string. Parameters but the crypdec parameter are forwardet to the crypdec. @param codec The codec to use. */ String.prototype.decrypt=function(crydec){ var n = "decrypt_" + crydec; if(String.prototype[n]){ var args=[]; for(var i=1;i<arguments.length;i++){ args[i-1] = arguments[i]; } return String.prototype[n].apply(this, args); }else{ throw new mod.Exception("Encrypter '%s' not found.".format(crydec)); } } /** Encrypts a string using XOR. The whole String will be XORed with the key. If the key is shorter than the String then it will be multiplied to fit the length of the String. @param key The key to use for encryption. */ String.prototype.encrypt_xor=function(key){ var e=new Array(this.length); var l=key.length; for(var i=0;i<this.length;i++){ e[i] = String.fromCharCode(this.charCodeAt(i) ^ key.charCodeAt(i % l)); } return e.join(""); } /** Decrypts a string using XOR. Since XORing is symetric it is the same as the encrypter. @param key The key to use for decryption. */ String.prototype.decrypt_xor=String.prototype.encrypt_xor; /** Encrypts a string using the ARC4 algorithm. @param key The key to use for encryption. */ String.prototype.encrypt_rc4=function(key){ //generate substitution box var sbox = new Array (256); for (var i=0; i<256; i++){ sbox[i]=i; } //swap things around var j=0; for (var i=0; i < 256; i++) { j = (j + sbox[i] + key.charCodeAt(i % key.length)) % 256; var tmp = sbox[i]; sbox[i] = sbox[j]; sbox[j] = tmp; } //calculate the result var i=256; var j=256; var rslt=new Array(this.length); for (var k=0; k < this.length; k++) { i = (i + 1) % 256; j = (j + sbox[i]) % 256; var tmp = sbox[i]; sbox[i] = sbox[j]; sbox[j] = tmp; t = (sbox[i] + sbox[j]) % 256; rslt[k] = String.fromCharCode(this.charCodeAt(k) ^ sbox[t]); } return rslt.join(""); } /** Decrypts a string using the ARC4 algorithm. Since it is symetric it is the same as the encrypter. @param key The key to use for decryption. */ String.prototype.decrypt_rc4=String.prototype.encrypt_rc4; })