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