1 package {

     2     

     3     import flash.display.Sprite;

     4     import flash.system.Capabilities;

     5     

     6     public class GUID extends Object {

     7         

     8         private static var counter:Number = 0;

     9         

    10         function GUID(){

    11             

    12         }

    13         

    14         public static function create():String {

    15             var dt:Date = new Date();

    16             var id1:Number = dt.getTime();

    17             var id2:Number = Math.random()*Number.MAX_VALUE;

    18             var id3:String = Capabilities.serverString;

    19             var rawID:String = calculate(id1+id3+id2+counter++).toUpperCase();

    20             var finalString:String = rawID.substring(0, 8) + "-" + rawID.substring(8, 12) + "-" + rawID.substring(12, 16) + "-" + rawID.substring(16, 20) + "-" + rawID.substring(20, 32);

    21             return finalString;

    22         }

    23         

    24         private static function calculate(src:String):String {

    25             return hex_sha1(src);

    26         }

    27         

    28         private static function hex_sha1(src:String):String {

    29             return binb2hex(core_sha1(str2binb(src), src.length*8));

    30         }

    31         

    32         private static function core_sha1(x:Array, len:Number):Array {

    33             x[len >> 5] |= 0x80 << (24-len%32);

    34             x[((len+64 >> 9) << 4)+15] = len;

    35             var w:Array = new Array(80), a:Number = 1732584193;

    36             var b:Number = -271733879, c:Number = -1732584194;

    37             var d:Number = 271733878, e:Number = -1009589776;

    38             for (var i:Number = 0; i<x.length; i += 16) {

    39                 var olda:Number = a, oldb:Number = b;

    40                 var oldc:Number = c, oldd:Number = d, olde:Number = e;

    41                 for (var j:Number = 0; j<80; j++) {

    42                     if (j<16) w[j] = x[i+j];

    43                     else w[j] = rol(w[j-3] ^ w[j-8] ^ w[j-14] ^ w[j-16], 1);

    44                     var t:Number = safe_add(safe_add(rol(a, 5), sha1_ft(j, b, c, d)), safe_add(safe_add(e, w[j]), sha1_kt(j)));

    45                     e = d; d = c;

    46                     c = rol(b, 30);

    47                     b = a; a = t;

    48                 }

    49                 a = safe_add(a, olda);

    50                 b = safe_add(b, oldb);

    51                 c = safe_add(c, oldc);

    52                 d = safe_add(d, oldd);

    53                 e = safe_add(e, olde);

    54             }

    55             return new Array(a, b, c, d, e);

    56         }

    57         

    58         private static function sha1_ft(t:Number, b:Number, c:Number, d:Number):Number {

    59             if (t<20) return (b & c) | ((~b) & d);

    60             if (t<40) return b ^ c ^ d;

    61             if (t<60) return (b & c) | (b & d) | (c & d);

    62             return b ^ c ^ d;

    63         }

    64         

    65         private static function sha1_kt(t:Number):Number {

    66             return (t<20) ? 1518500249 : (t<40) ? 1859775393 : (t<60) ? -1894007588 : -899497514;

    67         }

    68         

    69         private static function safe_add(x:Number, y:Number):Number {

    70             var lsw:Number = (x & 0xFFFF)+(y & 0xFFFF);

    71             var msw:Number = (x >> 16)+(y >> 16)+(lsw >> 16);

    72             return (msw << 16) | (lsw & 0xFFFF);

    73         }

    74         

    75         private static function rol(num:Number, cnt:Number):Number {

    76             return (num << cnt) | (num >>> (32-cnt));

    77         }

    78         

    79         private static function str2binb(str:String):Array {

    80             var bin:Array = new Array();

    81             var mask:Number = (1 << 8)-1;

    82             for (var i:Number = 0; i<str.length*8; i += 8) {

    83                 bin[i >> 5] |= (str.charCodeAt(i/8) & mask) << (24-i%32);

    84             }

    85             return bin;

    86         }

    87         

    88         private static function binb2hex(binarray:Array):String {

    89             var str:String = new String("");

    90             var tab:String = new String("0123456789abcdef");

    91             for (var i:Number = 0; i<binarray.length*4; i++) {

    92                 str += tab.charAt((binarray[i >> 2] >> ((3-i%4)*8+4)) & 0xF) + tab.charAt((binarray[i >> 2] >> ((3-i%4)*8)) & 0xF);

    93             }

    94             return str;

    95         }

    96     }

    97 }

    98 

    99 

   100 

   101 // USAGE /////////////////////////////////////////

   102 /*

   103 var myGUID:String = GUID.create();

   104 trace("myGUID: "+myGUID);

   105 */

   106 

   107 // OUTPUT

   108 // myGUID: 6EF3BDEC-5B51-3CE9-429C-F99A46EC0980

   109 //////////////////////////////////////////////////