URL Parameter verschlüsseln mit DEC 5.2 (AES 128)

[Ajintaro]

Leider habe ich keine weiteren Informationen bekommen. Ich habe höchstens den original Quelltext des Aufgabenstellers:

Code:

function byteArrayToHex(b) {
      var a = "";
      if (b) {
          for (var c = 0; c < b.length; c++)
              a += (b[c] < 16 ? "0" : "") + b[c].toString(16);
          return a
      }
  }
  function getRandomBytes(b) {
      var a, c = [];
      for (a = 0; a < b; a++)
          c[a] = Math.round(Math.random() * 255);
      return c
  }
  function hex2s(b) {
      var a = "";
      if (b.indexOf("0x") == 0 || b.indexOf("0X") == 0)
          b = b.substr(2);
      if (b.length % 2)
          b += "0";
      for (var c = 0; c < b.length; c += 2)
          a += String.fromCharCode(parseInt(b.slice(c, c + 2), 16));
      return a
  }
  function formatPlaintext(b) {
      var a = blockSizeInBits / 8, c;
      if (typeof b == "string" || b.indexOf) {
          b = b.split("");
          for (c = 0; c < b.length; c++)
              b[c] = b[c].charCodeAt(0) & 255
      }
      for (c = a - b.length % a; c > 0 && c < a; c--)
          b[b.length] = 0;
      return b
  }
  function rijndaelEncrypt(b, a, c) {
      var d, e = blockSizeInBits / 8, f;
      if (b && a)
          if (a.length * 8 == keySizeInBits) {
              if (c == "CBC")
                  f = getRandomBytes(e);
              else {
                  c = "ECB";
                  f = []
              }
              b = formatPlaintext(b);
              for (var h = new keyExpansion(a), g = 0; g < b.length / e; g++) {
                  d = b.slice(g * e, (g + 1) * e);
                  if (c == "CBC")
                      for (a = 0; a < e; a++)
                          d[a] ^= f[g * e + a];
                  f = f.concat(AESencrypt(d, h))
              }
              return f
          }
  }
  var encryptRequest = function(url) {
    
    var key = "thesecretkey";
    window.blockSizeInBits = 128;
        window.keySizeInBits = key.length * 4;
        var urlStart = url.substring(0, url.indexOf('?') + 1);
    var queryString = url.substring(url.indexOf('?') + 1);
    var queryToEncrypt = [];
    var queryRest = [];
    var queryStringToEncrypt = "";
    var queryStringRest = "";
    var params = queryString.split("&");
    for (var i = 0; i < params.length; i++) {
      var param = params[i];
      if (param.indexOf("MIKE=") == 0 || param.indexOf("HEINZ=") == 0 || param.indexOf("ULRIKE=") == 0 || param.indexOf("DELPHI=") == 0) {
        queryStringRest += param + '&';
      } else {
        queryStringToEncrypt += param + '&';
      }
    }
    var  d  =  new Date(new Date().getTime() + new Date().getTimezoneOffset() * 6E4);
    var ENC_TIME = d.format("yyyymmddHHMMss");
    queryStringToEncrypt += "&ENC_TIME=" + ENC_TIME;
    var ENC = (byteArrayToHex(rijndaelEncrypt(queryStringToEncrypt, hex2s(key), "ECB")) + "").toUpperCase();
    
      return urlStart + queryStringRest + "ENC="+ENC;
  };

Aber das hilft mir auch nur bedingt..