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Composite Hash Generator

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Oct 27th, 2016
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  1. <!DOCTYPE html>
  2. <html>
  3.     <head>
  4.         <script src="http://peterolson.github.com/BigInteger.js/BigInteger.min.js"></script>
  5.        
  6.         <!-- Simple Password Hash Library -->
  7.        
  8.         <script>
  9.     /* 
  10.         Calculates the value of (mantissa * (base^exponent)) and stores it into a bigInt
  11.     */ 
  12.         function bigInt_from_shorthand(mantissa, base, exponent)
  13.         {
  14.             return bigInt(mantissa).multiply(bigInt(base).pow(bigInt(exponent)));
  15.         }  
  16.     /* 
  17.         See more large sophie-germain primes at http://yves.gallot.pagesperso-orange.fr/primes/chrrcds.html#Sophie 
  18.     */     
  19.         function safe_prime_from_sophie_germain_shorthand(mantissa, base, exponent, adjustment)
  20.         {
  21.             return bigInt(1).add(bigInt(2).multiply(bigInt(adjustment).add(bigInt_from_shorthand(mantissa, base, exponent))));
  22.         }
  23.     /* 
  24.         The final hash will essentially be the sum of two distinct values obtained from this function
  25.     */     
  26.         function make_preliminary_hash_integer(value, first, second, modulus)
  27.         {      
  28.             var temp = first.multiply(value).multiply(second);
  29.             return temp.multiply(temp).mod(modulus);
  30.         }
  31.     /* 
  32.         Passing -1 as the truncate_length parameter truncates to the original text length, while zero means no truncation...
  33.     */         
  34.         function make_safe_hash(text, truncate_length = 0)
  35.         {
  36.             text.trim();
  37.             var length = text.length;
  38.         /* 
  39.             The mapping may seem somewhat obscure, but just keep in mind that the point
  40.             here is merely to create a number suitable for use with this particular hash function
  41.         */     
  42.             var pad = "9";
  43.             var digits = pad;
  44.             for(var index = 0; index < length; ++index)
  45.             {
  46.                 var data = text[index].charCodeAt();
  47.             //  The resulting number is more likely to be unique if each character generates a three-digit sequence
  48.                 if(data < 100)
  49.                     digits += pad;
  50.                 digits += data;
  51.             }
  52.             digits += pad;
  53.             var value = bigInt(digits);    
  54.             if(typeof make_safe_hash.initialized === "undefined")
  55.             {
  56.                 make_safe_hash.initialized = true;
  57.                 make_safe_hash.lhs =
  58.                 {
  59.                     first : safe_prime_from_sophie_germain_shorthand(72021, 2, 23630, -1),
  60.                     second : safe_prime_from_sophie_germain_shorthand(14516877, 2, 24176, -1),
  61.                     modulus : safe_prime_from_sophie_germain_shorthand(18458709, 2, 32611, -1)
  62.                 };
  63.                 make_safe_hash.rhs =
  64.                 {
  65.                     first : safe_prime_from_sophie_germain_shorthand(470943129, 2, 16352, -1),
  66.                     second : safe_prime_from_sophie_germain_shorthand(8069496435, 10, 5072, -1),
  67.                     modulus : safe_prime_from_sophie_germain_shorthand(2375063906985, 2, 19380, -1)
  68.                 };             
  69.             }
  70.             var lhs = make_preliminary_hash_integer
  71.             (
  72.                 value,
  73.                 make_safe_hash.lhs.first,
  74.                 make_safe_hash.lhs.second,
  75.                 make_safe_hash.lhs.modulus
  76.             );
  77.             var rhs = make_preliminary_hash_integer
  78.             (
  79.                 value,
  80.                 make_safe_hash.rhs.first,
  81.                 make_safe_hash.rhs.second,
  82.                 make_safe_hash.rhs.modulus
  83.             );
  84.             var result = lhs.add(rhs).toString();
  85.             if(truncate_length)
  86.                 result = result.substr(0, truncate_length < 0 ? length : truncate_length);
  87.             return result;
  88.         }
  89.     /* 
  90.         Passing -1 as the truncate_length parameter truncates to the original text length, while zero means no truncation...
  91.     */     
  92.         function make_user_hash(username, password, truncate_length = 0)
  93.         {
  94.         //  Note: 0x1e was chosen for the simple fact that it represents the "record separator" code in ascii
  95.             return make_safe_hash(username.trim() + "\u001e" + password.trim(), truncate_length);
  96.         }
  97.         </script>
  98.        
  99.         <!-- Test Program -->
  100.        
  101.         <script>
  102.         function display()
  103.         {
  104.             var length_input = document.getElementById('length');
  105.             var length = Number(length_input.value);
  106.             if(isNaN(length) || !length)
  107.             {
  108.                 length = 0;
  109.                 length_input.value = "(default)";
  110.             }  
  111.             var username = document.getElementById('username').value;
  112.             var password = document.getElementById('password').value;
  113.             document.getElementById('output').innerHTML = make_user_hash(username, password, length).toString();
  114.         }
  115.         function toggle()
  116.         {
  117.             var input = document.getElementById('password');
  118.             var button = document.getElementById('visibility');
  119.             if(button.value ==  "show")
  120.             {
  121.                 input.type = "text";
  122.                 button.value = "hide";
  123.             }
  124.             else
  125.             {
  126.                 input.type = "password";
  127.                 button.value = "show";     
  128.             }
  129.         }
  130.         </script>
  131.     </head>
  132.     <body style = "background-color:#cddeee;color:#369;font-family:Arial,Helvetica,sans-serif;">
  133.         <br/>
  134.         <h1 align = "center">Composite Hash Generator</h1>
  135.         <br/>
  136.         <br/>
  137.         <br/>
  138.         <form onsubmit="display()" action="javascript:void(0)">
  139.             <table align = "center" style = "border-spacing:15px;border-collapse:separate;">
  140.                 <tr>
  141.                     <td>
  142.                         Username (optional)
  143.                     </td>
  144.                     <td>
  145.                         Password
  146.                         &nbsp;
  147.                         <input type = "button" id = "visibility" value = "show" onclick = "toggle()"/>
  148.                     </td>
  149.                     <td>
  150.                         Length
  151.                     </td>
  152.                 </tr>
  153.                 <tr>
  154.                     <td>
  155.                         <input type = "text" id = "username" onfocus = "this.select()"/>
  156.                     </td>
  157.                     <td>
  158.                         <input type = "password" id = "password" onfocus = "this.select()"/>
  159.                     </td>
  160.                     <td>
  161.                         <input type = "text" id = "length" onfocus = "this.select()" value = "(default)"/>
  162.                     </td>
  163.                 <tr>           
  164.                     <td></td>
  165.                     <td align="center">
  166.                         <input type = "submit" id = "generate" value = "Generate!"/>
  167.                     </td>
  168.                     <td></td>              
  169.                 </tr>          
  170.             </table>
  171.         </form>
  172.         <p id="output" style = "word-wrap:break-word;"></p>
  173.     </body>
  174. </html>
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