pD-H Message Digest [JS & PHP]

[Peter]

I have created this for Javascript and PHP, so if you need to send something that has been hashed* to PHP to do some comparing, then you can just call the digest PHP class.

Now, what it basically does is attempts to create a 32 character long hash*, sort of like how md5 and sha1 work, just not as good as them obviously

To see the Javascript version in action, have a play with this...

[CLICK]

Javascript version

<script type="text/javascript">
<!--

// pD-H Message Digest

String.prototype.hash = function(){
    var iHashStr = "", iPreHash = "";
    var iCA = [];
    var iCount = 0;
    var iHexTab = "0123456789abcdef";

    if(this && this.length > 0){
       for(s = 0; s < (this.length * 8); s += 8){
          iCA |= ((this.charCodeAt(s / 8) & 255) << (s % 32));
       }

       iCA[(iCA.length * 8) >> 5] |= (128 << ((iCA.length * 8) % 32));

       while(iCA.length < 16){
          iCA[iCA.length] = Math.ceil(((iCA[iCount ++] * 2) + (iCount << 8)) >> 2);
       }

       iPreHash = iCA.toString().replace(/,/g, "").substring(0, 32);

       for(h = 0; h < 32; h ++){
          iHashStr += iHexTab.charAt((iPreHash.charAt(h) * 5) % 16);
       }
       return iHashStr;
    }
}

//-->
</script>

Now, to use it, just look at the example...


var myString = "javascript rocks";
var myStringHashed = myString.hash();
alert(myStringHashed)


Simple to use. the hashed* string is stored in the "myStringHashed" variable, and then alerted.

---

PHP Version

Here is the same script but converted to PHP.



<?php

// pD-H Message Digest

class digest {
    var $iHexTab = "0123456789abcdef";
    var $iHashStr = "";

    function hash($str){
       $iPreHash = "";
       $iCount = 0;
       $iHashStr = "";
       $iCA = array();

       if($str && strlen($str) > 0){
          for($s = 0; $s < (strlen($str) * 8); $s += 8){
             $iCA[$s >> 5] |= ((ord($str[$s / 8]) & 255) << ($s % 32));
          }

          $iCA[(count($iCA) * 8) >> 5] |= (128 << ((count($iCA) * 8) % 32));


          while(count($iCA) < 16){
             $iCA[] = ceil((($iCA[$iCount ++] * 2) + ($iCount << 8)) >> 2);
          }

          foreach($iCA as $val){
             $iPreHash .= $val;
          }

          $iPreHash = substr($iPreHash, 0, 32);
          $this -> iHashStr = "";

          for($h = 0; $h < 32; $h ++){
             $this -> iHashStr .= ($this -> iHexTab[(intval($iPreHash[$h]) * 5) % 16]);
          }

          return $this -> iHashStr;
       }
    }
}

?>


To use this one we need to create an instance first, so have a look at this example...


$digest = new digest();
$hashed = $digest -> hash("PHP Rocks");
echo $hashed;


If ran, it will echo the hashed* string.

Hope it is useful for someone.

*a hash is not an encrypted version of the original inputted string, it is sort of like a finger print. So reversing the hash should be near impossible, but I can't say for sure that the generated hashes aren't reversible, so I wasn't sure if I should use the term "hash", but decided to in the end.

[acoolie530]

I just read up on >> and <<, and they seem logical, but how is |= used? On php.net, i found an example using |=, but it only explains that | is the or operator. Or Equals does not sound proper :-P

[Peter]

Just does a binary math on to 2 binary values. If a value in a column in both values is 0, then the value for both columns is 0, anything else is set to 1.

Example:

8 = 1000
5 = 0101

8 | 5 = 13

13 = 1101

As for the |=, it is just like a = a | b

[acoolie530]

peter said:

Just does a binary math on to 2 binary values. If a value in a column in both values is 0, then the value for both columns is 0, anything else is set to 1.

Example:

8 = 1000
5 = 0101

8 | 5 = 13

13 = 1101

As for the |=, it is just like a = a | b

Interesting.. thanks for the help

[Peter]

Anytime

[Eric]

Pretty good Peter

I really don't think it could be undone, but who am I to know .

[crazynarutard]

Great codes Peter