/* JQuery RC4 encryption/decryption
* Copyright (c) 2009 by Tony Simek.
* released under the terms of the Gnu Public License.
* Email: tony.simek@gmail.com
*/
if (typeof $.fn.rc4 === "undefined") {
  (function ($) {
    $.fn.rc4 = function (settings) {
      var defaults = { key: null, method: "encrypt", callback: null };
      var options = $.extend(defaults, settings);
      if ($.fn.rc4.ctrlrInst == null) { $.fn.rc4.ctrlrInst = new $.fn.rc4.ctrlr(options); }
      return this.each(function () {
        $.fn.rc4.ctrlrInst.settings = options;
        $.fn.rc4.ctrlrInst.container = this; $.fn.rc4.ctrlrInst.initialise(this);
      });
    }
    $.extend({ hexEncode: function (data) {
      var b16D = '0123456789abcdef'; var b16M = new Array();
      for (var i = 0; i < 256; i++) { b16M[i] = b16D.charAt(i >> 4) + b16D.charAt(i & 15); }
      var result = new Array(); for (var i = 0; i < data.length; i++) { result[i] = b16M[data.charCodeAt(i)]; }
      return result.join('');
    }, hexDecode: function (data) {
      var b16D = '0123456789abcdef'; var b16M = new Array();
      for (var i = 0; i < 256; i++) { b16M[b16D.charAt(i >> 4) + b16D.charAt(i & 15)] = String.fromCharCode(i); }
      if (!data.match(/^[a-f0-9]*$/i)) return false; if (data.length % 2) data = '0' + data;
      var result = new Array(); var j = 0; for (var i = 0; i < data.length; i += 2) { result[j++] = b16M[data.substr(i, 2)]; }
      return result.join('');
    }, rc4Encrypt: function (key, pt) {
      s = new Array(); for (var i = 0; i < 256; i++) { s[i] = i; }; var j = 0; var x;
      for (i = 0; i < 256; i++) { j = (j + s[i] + key.charCodeAt(i % key.length)) % 256; x = s[i]; s[i] = s[j]; s[j] = x; }
      i = 0; j = 0; var ct = ''; for (var y = 0; y < pt.length; y++) {
        i = (i + 1) % 256; j = (j + s[i]) % 256; x = s[i]; s[i] = s[j]; s[j] = x;
        ct += String.fromCharCode(pt.charCodeAt(y) ^ s[(s[i] + s[j]) % 256]);
      } return ct;
    }, rc4Decrypt: function (key, ct) {
      return $.rc4Encrypt(key, ct);
    }, rc4EncryptStr: function (str, key) {
      return $.hexEncode($.rc4Encrypt(key, unescape(encodeURIComponent(str))));
    }, rc4DecryptStr: function (hexStr, key) { return decodeURIComponent(escape($.rc4Decrypt(key, $.hexDecode(hexStr)))); }
    });
    $.rc4 = {}; $.fn.rc4.ctrlrInst = null; $.fn.rc4.ctrlr = function (settings) { this.settings = settings; }; var ctrlr = $.fn.rc4.ctrlr;
    ctrlr.prototype.initialise = function () {
      if (this.settings.key) {
        if (this.settings.method) {
          if ($.trim(this.settings.method.toUpperCase()) == "ENCRYPT") {
            this.setObjectValue($.hexEncode($.rc4Encrypt(this.settings.key, this.getObjectValue())))
          }
          if ($.trim(this.settings.method.toUpperCase()) == "DECRYPT") {
            this.setObjectValue($.rc4Decrypt(this.settings.key, $.hexDecode(this.getObjectValue())));
          } 
        } 
      };
    }
    ctrlr.prototype.getObjectValue = function () {
      if ($.fn.rc4.ctrlrInst.container.innerHTML) { return $.fn.rc4.ctrlrInst.container.innerHTML; }
      if ($.fn.rc4.ctrlrInst.container.value) { return $.fn.rc4.ctrlrInst.container.value; } 
    }
    ctrlr.prototype.setObjectValue = function (data) {
      if ($.fn.rc4.ctrlrInst.container.innerHTML) { $.fn.rc4.ctrlrInst.container.innerHTML = data; }
      if ($.fn.rc4.ctrlrInst.container.value) { $.fn.rc4.ctrlrInst.container.value = data; } 
    }
  })(jQuery);
}