Tiny Encrytion Algorithm (TEA)

Question

Hi Guys!
I am currently developing the Tiny Encrytion Algorithm
Currenlty is takes in a number to encrytp and works fine but I want to ammend this so it takes in a string.
My current "get" method is as follows:
public void getNumber() {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int count = 0, idx = 0;
        try {
            String number = br.readLine();
            while (count <= 1) {
                num_array[count++] = Integer.parseInt(number.substring(idx, idx + 2));
                idx += 2;
        } catch (IOException ex) {
            ex.printStackTrace();
        } catch (NumberFormatException ex) {
            ex.printStackTrace();
            System.out.println("You have entered an invalid number");
    }How do I go about amending this to take in a String, but still cut it up and save it to an Integer array? (The integer array is required for the encrytion process at a later stage).
So in other words, i need to get from String to Integer, while cutting it up!!
I have played about with the charAt() and toBytes() method but i'm just going round in circles! :(
Cheers!!!
Edited by: smitty350z on Oct 31, 2007 4:49 AM

Answer 1

HI Sabre,
Thanks so much for the immediate reply. I can paste the entire equivalent TEA algorithm that i wrote in java script. That didnt work, then i tried the Java side, bcos eventually i can call it from java script. The main task is to embed the script in to my load test runner. For your reference, please see below the java script equivalent that was written, and debugiing this a big nightmare. Sorry for the format of the javascript codes, its a bit annoying.
Thanks so much
function encrypt(src, key, token) {
          if(src.length == 0) return "";
alert("strToChars(src):" + strToChars(src));
alert("charsToLongs(strToChars(src)):" + charsToLongs(strToChars(src)));
alert("hexToChars(key):" + hexToChars(key));
alert("charsToLongs(hexToChars(key)):" + charsToLongs(hexToChars(key)));
          var v = charsToLongs(strToChars(src));
          var k = charsToLongs(hexToChars(key));
          var n = v.length;
          if (n % 2==1) v[n++] = 0;
          tempv = new Array(2);
          newv = new Array(v.length);
          for (i=0; i<v.length; i=i+2){
               tempv = tea_code(k,v,v[i+1]);
               newv[i] = tempv[0];
               newv[i+1] = tempv[1];
          var encStr = charsToHex(longsToChars(newv));
alert("encStr"+ encStr);
          return [key,(token + encStr)];
function strToChars(src) {
     var codes = [];
     var strArr = src.split("");
     strArr1 = new String(strArr);
     var sl = strArr.length;
     var cnt = 0;
     var schar="";
     var intStringLen=strArr1.length;
     for (var intCur = 0; intCur < intStringLen; intCur++) {
          codes[intCur] = strArr1.charCodeAt(intCur);
     return codes;
function charsToLongs(chars) {
     var tlength = Math.ceil(chars.length/4);
     var temp = [];
     var ti = 0;
     for(var i = 0; i<tlength; i++){
          ti = i*4;
          temp[i] = (((chars[ti] << 24) + (chars[ti+1]<<16)) + (chars[ti+2]<<8)) + chars[ti+3];
     return temp;
function hexToChars(hex) {
          var codes = [];
          var hexArr = hex.split("");
          var hl = hexArr.length/2;
          for(var i=0;i<hl;i++) {
//               codes[i] = int("0x"+hexArr[i*2]+hexArr[(i*2)+1]);
               codes[i] = Math.round("0x"+hexArr[i*2]+hexArr[(i*2)+1]);
          return codes;
function tea_code (k,y,z) {
     sum = 0;n = 32;
     //while (sum != -957401312) {
     while (n-- >= 0) {
          y = Math.round(y + ((((z << 4) ^ (z >>> 5)) + z) ^ (sum + k[sum & 3]))); y = y|0 ;
          sum = Math.round(sum + 0x9E3779B9);
          sum = sum|0;
          z = Math.round(z + ((((y << 4) ^ (y >>> 5)) + y) ^ (sum + k[(sum >>> 11) & 3]))); z = z|0 ;
     return [y,z];