186 lines
6.4 KiB
ActionScript
186 lines
6.4 KiB
ActionScript
/**
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* MD5
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*
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* An ActionScript 3 implementation of the RSA Data Security, Inc. MD5 Message
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* Digest Algorithm, as defined in RFC 1321.
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* Copyright (c) 2007 Henri Torgemane
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*
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* Derived from
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* A JavaScript implementation of the same.
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* Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
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* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
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*
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* See LICENSE.txt for full license information.
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*/
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package com.hurlant.crypto.hash
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{
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import flash.utils.ByteArray;
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public class MD5 implements IHash
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{
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public static const HASH_SIZE:int = 16;
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public function getInputSize():uint
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{
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return 64;
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}
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public function getHashSize():uint
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{
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return HASH_SIZE;
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}
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public function hash(src:ByteArray):ByteArray
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{
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var len:uint = src.length *8;
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// pad to nearest int.
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while (src.length%4!=0) {
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src[src.length]=0;
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}
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// convert ByteArray to an array of uint
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src.position=0;
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var a:Array = [];
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src.endian="littleEndian";
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for (var i:uint=0;i<src.length;i+=4) {
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a.push(src.readUnsignedInt());
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}
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var h:Array = core_md5(a, len);
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var out:ByteArray = new ByteArray;
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out.endian="littleEndian";
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for (i=0;i<4;i++) {
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out.writeUnsignedInt(h[i]);
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}
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return out;
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}
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private function core_md5(x:Array, len:uint):Array {
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/* append padding */
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x[len >> 5] |= 0x80 << ((len) % 32);
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x[(((len + 64) >>> 9) << 4) + 14] = len;
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var a:uint = 0x67452301; // 1732584193;
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var b:uint = 0xEFCDAB89; //-271733879;
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var c:uint = 0x98BADCFE; //-1732584194;
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var d:uint = 0x10325476; // 271733878;
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for(var i:uint = 0; i < x.length; i += 16)
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{
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x[i]||=0; x[i+1]||=0; x[i+2]||=0; x[i+3]||=0;
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x[i+4]||=0; x[i+5]||=0; x[i+6]||=0; x[i+7]||=0;
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x[i+8]||=0; x[i+9]||=0; x[i+10]||=0; x[i+11]||=0;
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x[i+12]||=0; x[i+13]||=0; x[i+14]||=0; x[i+15]||=0;
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var olda:uint = a;
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var oldb:uint = b;
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var oldc:uint = c;
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var oldd:uint = d;
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a = ff(a, b, c, d, x[i+ 0], 7 , 0xD76AA478);
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d = ff(d, a, b, c, x[i+ 1], 12, 0xE8C7B756);
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c = ff(c, d, a, b, x[i+ 2], 17, 0x242070DB);
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b = ff(b, c, d, a, x[i+ 3], 22, 0xC1BDCEEE);
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a = ff(a, b, c, d, x[i+ 4], 7 , 0xF57C0FAF);
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d = ff(d, a, b, c, x[i+ 5], 12, 0x4787C62A);
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c = ff(c, d, a, b, x[i+ 6], 17, 0xA8304613);
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b = ff(b, c, d, a, x[i+ 7], 22, 0xFD469501);
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a = ff(a, b, c, d, x[i+ 8], 7 , 0x698098D8);
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d = ff(d, a, b, c, x[i+ 9], 12, 0x8B44F7AF);
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c = ff(c, d, a, b, x[i+10], 17, 0xFFFF5BB1);
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b = ff(b, c, d, a, x[i+11], 22, 0x895CD7BE);
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a = ff(a, b, c, d, x[i+12], 7 , 0x6B901122);
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d = ff(d, a, b, c, x[i+13], 12, 0xFD987193);
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c = ff(c, d, a, b, x[i+14], 17, 0xA679438E);
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b = ff(b, c, d, a, x[i+15], 22, 0x49B40821);
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a = gg(a, b, c, d, x[i+ 1], 5 , 0xf61e2562);
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d = gg(d, a, b, c, x[i+ 6], 9 , 0xc040b340);
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c = gg(c, d, a, b, x[i+11], 14, 0x265e5a51);
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b = gg(b, c, d, a, x[i+ 0], 20, 0xe9b6c7aa);
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a = gg(a, b, c, d, x[i+ 5], 5 , 0xd62f105d);
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d = gg(d, a, b, c, x[i+10], 9 , 0x2441453);
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c = gg(c, d, a, b, x[i+15], 14, 0xd8a1e681);
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b = gg(b, c, d, a, x[i+ 4], 20, 0xe7d3fbc8);
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a = gg(a, b, c, d, x[i+ 9], 5 , 0x21e1cde6);
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d = gg(d, a, b, c, x[i+14], 9 , 0xc33707d6);
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c = gg(c, d, a, b, x[i+ 3], 14, 0xf4d50d87);
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b = gg(b, c, d, a, x[i+ 8], 20, 0x455a14ed);
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a = gg(a, b, c, d, x[i+13], 5 , 0xa9e3e905);
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d = gg(d, a, b, c, x[i+ 2], 9 , 0xfcefa3f8);
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c = gg(c, d, a, b, x[i+ 7], 14, 0x676f02d9);
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b = gg(b, c, d, a, x[i+12], 20, 0x8d2a4c8a);
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a = hh(a, b, c, d, x[i+ 5], 4 , 0xfffa3942);
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d = hh(d, a, b, c, x[i+ 8], 11, 0x8771f681);
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c = hh(c, d, a, b, x[i+11], 16, 0x6d9d6122);
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b = hh(b, c, d, a, x[i+14], 23, 0xfde5380c);
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a = hh(a, b, c, d, x[i+ 1], 4 , 0xa4beea44);
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d = hh(d, a, b, c, x[i+ 4], 11, 0x4bdecfa9);
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c = hh(c, d, a, b, x[i+ 7], 16, 0xf6bb4b60);
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b = hh(b, c, d, a, x[i+10], 23, 0xbebfbc70);
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a = hh(a, b, c, d, x[i+13], 4 , 0x289b7ec6);
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d = hh(d, a, b, c, x[i+ 0], 11, 0xeaa127fa);
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c = hh(c, d, a, b, x[i+ 3], 16, 0xd4ef3085);
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b = hh(b, c, d, a, x[i+ 6], 23, 0x4881d05);
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a = hh(a, b, c, d, x[i+ 9], 4 , 0xd9d4d039);
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d = hh(d, a, b, c, x[i+12], 11, 0xe6db99e5);
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c = hh(c, d, a, b, x[i+15], 16, 0x1fa27cf8);
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b = hh(b, c, d, a, x[i+ 2], 23, 0xc4ac5665);
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a = ii(a, b, c, d, x[i+ 0], 6 , 0xf4292244);
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d = ii(d, a, b, c, x[i+ 7], 10, 0x432aff97);
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c = ii(c, d, a, b, x[i+14], 15, 0xab9423a7);
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b = ii(b, c, d, a, x[i+ 5], 21, 0xfc93a039);
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a = ii(a, b, c, d, x[i+12], 6 , 0x655b59c3);
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d = ii(d, a, b, c, x[i+ 3], 10, 0x8f0ccc92);
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c = ii(c, d, a, b, x[i+10], 15, 0xffeff47d);
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b = ii(b, c, d, a, x[i+ 1], 21, 0x85845dd1);
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a = ii(a, b, c, d, x[i+ 8], 6 , 0x6fa87e4f);
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d = ii(d, a, b, c, x[i+15], 10, 0xfe2ce6e0);
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c = ii(c, d, a, b, x[i+ 6], 15, 0xa3014314);
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b = ii(b, c, d, a, x[i+13], 21, 0x4e0811a1);
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a = ii(a, b, c, d, x[i+ 4], 6 , 0xf7537e82);
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d = ii(d, a, b, c, x[i+11], 10, 0xbd3af235);
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c = ii(c, d, a, b, x[i+ 2], 15, 0x2ad7d2bb);
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b = ii(b, c, d, a, x[i+ 9], 21, 0xeb86d391);
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a += olda;
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b += oldb;
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c += oldc;
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d += oldd;
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}
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return [ a, b, c, d ];
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}
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/*
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* Bitwise rotate a 32-bit number to the left.
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*/
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private function rol(num:uint, cnt:uint):uint
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{
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return (num << cnt) | (num >>> (32 - cnt));
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}
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/*
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* These functions implement the four basic operations the algorithm uses.
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*/
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private function cmn(q:uint, a:uint, b:uint, x:uint, s:uint, t:uint):uint {
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return rol(a + q + x + t, s) + b;
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}
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private function ff(a:uint, b:uint, c:uint, d:uint, x:uint, s:uint, t:uint):uint {
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return cmn((b & c) | ((~b) & d), a, b, x, s, t);
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}
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private function gg(a:uint, b:uint, c:uint, d:uint, x:uint, s:uint, t:uint):uint {
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return cmn((b & d) | (c & (~d)), a, b, x, s, t);
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}
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private function hh(a:uint, b:uint, c:uint, d:uint, x:uint, s:uint, t:uint):uint {
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return cmn(b ^ c ^ d, a, b, x, s, t);
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}
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private function ii(a:uint, b:uint, c:uint, d:uint, x:uint, s:uint, t:uint):uint {
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return cmn(c ^ (b | (~d)), a, b, x, s, t);
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}
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public function toString():String {
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return "md5";
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}
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}
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} |