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/js/lib/Socket.IO-node/support/socket.io-client/lib/vendor/web-socket-js/flash-src/com/hurlant/crypto/hash/SHA256.as

http://github.com/onedayitwillmake/RealtimeMultiplayerNodeJs
ActionScript | 115 lines | 81 code | 12 blank | 22 comment | 5 complexity | c14bc0555970db81a87f5d2b60e4288c MD5 | raw file
  1/**
  2 * SHA256
  3 * 
  4 * An ActionScript 3 implementation of Secure Hash Algorithm, SHA-256, as defined
  5 * in FIPS PUB 180-2
  6 * Copyright (c) 2007 Henri Torgemane
  7 * 
  8 * Derived from:
  9 * 		A JavaScript implementation of the Secure Hash Standard
 10 * 		Version 0.3 Copyright Angel Marin 2003-2004 - http://anmar.eu.org/
 11 * Derived from:
 12 * 		A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
 13 * 		in FIPS PUB 180-1
 14 * 		Version 2.1a Copyright Paul Johnston 2000 - 2002.
 15 * 		Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 16 * 
 17 * See LICENSE.txt for full license information.
 18 */
 19package com.hurlant.crypto.hash
 20{
 21	
 22
 23	public class SHA256 extends SHABase implements IHash
 24	{
 25		
 26		protected static const k:Array = [
 27		0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
 28		0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
 29		0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
 30		0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
 31		0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
 32		0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
 33		0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
 34		0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2];
 35		protected var h:Array = [
 36		0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
 37		];
 38		
 39		public function SHA256(){
 40		}
 41		
 42		public override function getHashSize():uint
 43		{
 44			return 32;
 45		}
 46		
 47		protected override function core(x:Array, len:uint):Array {
 48			/* append padding */
 49			x[len >> 5] |= 0x80 << (24 - len % 32);
 50			x[((len + 64 >> 9) << 4) + 15] = len;
 51		
 52			var w:Array = [];
 53			var a:uint = h[0];
 54			var b:uint = h[1];
 55			var c:uint = h[2];
 56			var d:uint = h[3];
 57			var e:uint = h[4];
 58			var f:uint = h[5];
 59			var g:uint = h[6];
 60			var h:uint = h[7];
 61			
 62			for (var i:uint=0; i<x.length; i+=16) {
 63				var olda:uint = a;
 64				var oldb:uint = b;
 65				var oldc:uint = c;
 66				var oldd:uint = d;
 67				var olde:uint = e;
 68				var oldf:uint = f;
 69				var oldg:uint = g;
 70				var oldh:uint = h;
 71
 72				for (var j:uint=0; j<64; j++) {
 73					if (j<16) {
 74						w[j] = x[i+j] || 0;
 75					} else {
 76						var s0:uint = rrol(w[j-15],7)^rrol(w[j-15],18)^(w[j-15]>>>3);
 77						var s1:uint = rrol(w[j-2], 17)^rrol(w[j-2],19)^(w[j-2]>>>10);
 78						w[j] = w[j-16] + s0 + w[j-7] + s1;
 79					}
 80					var t2:uint = (rrol(a,2) ^ rrol(a,13) ^ rrol(a,22)) + ((a&b) ^ (a&c) ^ (b&c));
 81					var t1:uint = h + (rrol(e,6) ^ rrol(e,11) ^ rrol(e,25)) + ((e&f)^(g&~e)) + k[j] + w[j]
 82					h = g;
 83					g = f;
 84					f = e;
 85					e = d + t1;
 86					d = c;
 87					c = b;
 88					b = a;
 89					a = t1 + t2;
 90
 91				}
 92				a += olda;
 93				b += oldb;
 94				c += oldc;
 95				d += oldd;
 96				e += olde;
 97				f += oldf;
 98				g += oldg;
 99				h += oldh;
100			}
101			return [ a,b,c,d,e,f,g,h ];
102		}
103		
104		/*
105		 * Bitwise rotate a 32-bit number to the right.
106		 */
107		protected function rrol(num:uint, cnt:uint):uint {
108		  return (num << (32-cnt)) | (num >>> cnt);
109		}
110		
111		public override function toString():String {
112			return "sha256";
113		}
114	}
115}