请指点使用javascript进行3DES加密解密问题

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//des_createKeys
//this takes as input a 64 bit key (even though only 56 bits are used)
//as an array of 2 integers, and returns 16 48 bit keys
function des_createKeys (key) {
     //declaring this locally speeds things up a bit
     var pc2bytes0  = new Array (0,0x4,0x20000000,0x20000004,0x10000,0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204);
     var pc2bytes1  = new Array (0,0x1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100,0x4000101,0x4100100,0x4100101);
     var pc2bytes2  = new Array (0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808,0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808);
     var pc2bytes3  = new Array (0,0x200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000,0x22000,0x222000,0x8022000,0x8222000);
     var pc2bytes4  = new Array (0,0x40000,0x10,0x40010,0,0x40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010);
     var pc2bytes5  = new Array (0,0x400,0x20,0x420,0,0x400,0x20,0x420,0x2000000,0x2000400,0x2000020,0x2000420,0x2000000,0x2000400,0x2000020,0x2000420);
     var pc2bytes6  = new Array (0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002);
     var pc2bytes7  = new Array (0,0x10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x20020000,0x20030000,0x20020800,0x20030800);
     var pc2bytes8  = new Array (0,0x40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002,0x2000002,0x2040002);
     var pc2bytes9  = new Array (0,0x10000000,0x8,0x10000008,0,0x10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x10000400,0x408,0x10000408);
     var pc2bytes10 = new Array (0,0x20,0,0x20,0x100000,0x100020,0x100000,0x100020,0x2000,0x2020,0x2000,0x2020,0x102000,0x102020,0x102000,0x102020);
     var pc2bytes11 = new Array (0,0x1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x5000200,0x4200000,0x5200000,0x4200200,0x5200200);
     var pc2bytes12 = new Array (0,0x1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010,0x81010,0x8080010,0x8081010);
     var pc2bytes13 = new Array (0,0x4,0x100,0x104,0,0x4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105);

     //how many iterations (1 for des, 3 for triple des)
     var iterations = key.length > 8 ? 3 : 1; //changed by Paul 16/6/2007 to use Triple DES for 9+ byte keys
     //stores the return keys
     var keys = new Array (32 * iterations);
    //now define the left shifts which need to be done
     var shifts = new Array (0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0);
     //other variables
     var lefttemp, righttemp, m=0, n=0, temp;

     for (var j=0; j<iterations; j++) { //either 1 or 3 iterations
         var left = (key.charCodeAt(m++) << 24) | (key.charCodeAt(m++) << 16) | (key.charCodeAt(m++) << 8) | key.charCodeAt(m++);
         var right = (key.charCodeAt(m++) << 24) | (key.charCodeAt(m++) << 16) | (key.charCodeAt(m++) << 8) | key.charCodeAt(m++);

         temp = ((left >>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4);
        temp = ((right >>> -16) ^ left) & 0x0000ffff; left ^= temp; right ^= (temp << -16);
         temp = ((left >>> 2) ^ right) & 0x33333333; right ^= temp; left ^= (temp << 2);
        temp = ((right >>> -16) ^ left) & 0x0000ffff; left ^= temp; right ^= (temp << -16);
         temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1);
         temp = ((right >>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8);
         temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1);

        //the right side needs to be shifted and to get the last four bits of the left side
         temp = (left << 8) | ((right >>> 20) & 0x000000f0);
        //left needs to be put upside down
        left = (right << 24) | ((right << 8) & 0xff0000) | ((right >>> 8) & 0xff00) | ((right >>> 24) & 0xf0);
         right = temp;

         //now go through and perform these shifts on the left and right keys
         for (var i=0; i < shifts.length; i++) {
             //shift the keys either one or two bits to the left
             if (shifts[i]) {left = (left << 2) | (left >>> 26); right = (right << 2) | (right >>> 26);}
             else {left = (left << 1) | (left >>> 27); right = (right << 1) | (right >>> 27);}
             left &= -0xf; right &= -0xf;

             //now apply PC-2, in such a way that E is easier when encrypting or decrypting
             //this conversion will look like PC-2 except only the last 6 bits of each byte are used
             //rather than 48 consecutive bits and the order of lines will be according to
             //how the S selection functions will be applied: S2, S4, S6, S8, S1, S3, S5, S7
             lefttemp = pc2bytes0[left >>> 28] | pc2bytes1[(left >>> 24) & 0xf]
                 | pc2bytes2[(left >>> 20) & 0xf] | pc2bytes3[(left >>> 16) & 0xf]
                 | pc2bytes4[(left >>> 12) & 0xf] | pc2bytes5[(left >>> 8) & 0xf]
                    | pc2bytes6[(left >>> 4) & 0xf];
            righttemp = pc2bytes7[right >>> 28] | pc2bytes8[(right >>> 24) & 0xf]
                 | pc2bytes9[(right >>> 20) & 0xf] | pc2bytes10[(right >>> 16) & 0xf]
                 | pc2bytes11[(right >>> 12) & 0xf] | pc2bytes12[(right >>> 8) & 0xf]
                 | pc2bytes13[(right >>> 4) & 0xf];
            temp = ((righttemp >>> 16) ^ lefttemp) & 0x0000ffff;
             keys[n++] = lefttemp ^ temp; keys[n++] = righttemp ^ (temp << 16);
         }
     } //for each iterations
     //return the keys we've created
     return keys;
} //end of des_createKeys
function genkey(key, start, end) {
     //8 byte / 64 bit Key (DES) or 192 bit Key
     return {key:pad(key.slice(start, end)),vector:1};
     }
function pad(key) {
    for (var i = key.length; i<24; i++) {
         key+="0";
   }
    return key;
}
function stringToHex (s) {
  var r = "";
  var hexes = new Array ("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");
  for (var i=0; i<s.length; i++) {r += hexes [s.charCodeAt(i) >> 4] + hexes [s.charCodeAt(i) & 0xf];}
  return r;
}function hexToString (h) {
  var r = "";
  for (var i= (h.substr(0, 2)=="0x")?2:0; i<h.length; i+=2) {r += String.fromCharCode (parseInt (h.substr (i, 2), 16));}
  return r;
}des3iv = "12345678"
var DES3 = {
    //3DES加密，CBC/PKCS5Padding
    encrypt:function(key,input){
        var genKey = genkey(key, 0, 24);
        return  stringToHex(des(genKey.key, input, 1, 0, des3iv, 1));
    },
    ////3DES解密，CBC/PKCS5Padding
    decrypt:function(key,input){
        var genKey = genkey(key, 0, 24);
        return des(genKey.key, hexToString(input), 0, 0, des3iv, 1);