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/**
* MD5
*
* An ActionScript 3 implementation of the RSA Data Security, Inc. MD5 Message
* Digest Algorithm, as defined in RFC 1321.
* Copyright (c) 2007 Henri Torgemane
*
* Derived from
* A JavaScript implementation of the same.
* Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
*
* Note:
* This algorithm should not be your first choice for new developements, but is
* included to allow interoperability with existing codes and protocols.
*
* See LICENSE.txt for full license information.
*/
package com.hurlant.crypto.hash
{
import flash.utils.ByteArray;
import flash.utils.Endian;
public class MD5 implements IHash
{
public static const HASH_SIZE:int = 16;
public var pad_size:int = 48;
public function MD5() { }
public function getInputSize():uint
{
return 64;
}
public function getHashSize():uint
{
return HASH_SIZE;
}
public function getPadSize():int
{
return pad_size;
}
public function hash(src:ByteArray):ByteArray
{
var len:uint = src.length *8;
var savedEndian:String = src.endian;
// pad to nearest int.
while (src.length%4!=0) {
src[src.length]=0;
}
// convert ByteArray to an array of uint
src.position=0;
var a:Array = [];
src.endian=Endian.LITTLE_ENDIAN
for (var i:uint=0;i<src.length;i+=4) {
a.push(src.readUnsignedInt());
}
var h:Array = core_md5(a, len);
var out:ByteArray = new ByteArray;
out.endian=Endian.LITTLE_ENDIAN;
for (i=0;i<4;i++) {
out.writeUnsignedInt(h[i]);
}
// restore length!
src.length = len/8;
src.endian = savedEndian;
return out;
}
private function core_md5(x:Array, len:uint):Array {
/* append padding */
x[len >> 5] |= 0x80 << ((len) % 32);
x[(((len + 64) >>> 9) << 4) + 14] = len;
var a:uint = 0x67452301; // 1732584193;
var b:uint = 0xEFCDAB89; //-271733879;
var c:uint = 0x98BADCFE; //-1732584194;
var d:uint = 0x10325476; // 271733878;
for(var i:uint = 0; i < x.length; i += 16)
{
x[i]||=0; x[i+1]||=0; x[i+2]||=0; x[i+3]||=0;
x[i+4]||=0; x[i+5]||=0; x[i+6]||=0; x[i+7]||=0;
x[i+8]||=0; x[i+9]||=0; x[i+10]||=0; x[i+11]||=0;
x[i+12]||=0; x[i+13]||=0; x[i+14]||=0; x[i+15]||=0;
var olda:uint = a;
var oldb:uint = b;
var oldc:uint = c;
var oldd:uint = d;
a = ff(a, b, c, d, x[i+ 0], 7 , 0xD76AA478);
d = ff(d, a, b, c, x[i+ 1], 12, 0xE8C7B756);
c = ff(c, d, a, b, x[i+ 2], 17, 0x242070DB);
b = ff(b, c, d, a, x[i+ 3], 22, 0xC1BDCEEE);
a = ff(a, b, c, d, x[i+ 4], 7 , 0xF57C0FAF);
d = ff(d, a, b, c, x[i+ 5], 12, 0x4787C62A);
c = ff(c, d, a, b, x[i+ 6], 17, 0xA8304613);
b = ff(b, c, d, a, x[i+ 7], 22, 0xFD469501);
a = ff(a, b, c, d, x[i+ 8], 7 , 0x698098D8);
d = ff(d, a, b, c, x[i+ 9], 12, 0x8B44F7AF);
c = ff(c, d, a, b, x[i+10], 17, 0xFFFF5BB1);
b = ff(b, c, d, a, x[i+11], 22, 0x895CD7BE);
a = ff(a, b, c, d, x[i+12], 7 , 0x6B901122);
d = ff(d, a, b, c, x[i+13], 12, 0xFD987193);
c = ff(c, d, a, b, x[i+14], 17, 0xA679438E);
b = ff(b, c, d, a, x[i+15], 22, 0x49B40821);
a = gg(a, b, c, d, x[i+ 1], 5 , 0xf61e2562);
d = gg(d, a, b, c, x[i+ 6], 9 , 0xc040b340);
c = gg(c, d, a, b, x[i+11], 14, 0x265e5a51);
b = gg(b, c, d, a, x[i+ 0], 20, 0xe9b6c7aa);
a = gg(a, b, c, d, x[i+ 5], 5 , 0xd62f105d);
d = gg(d, a, b, c, x[i+10], 9 , 0x2441453);
c = gg(c, d, a, b, x[i+15], 14, 0xd8a1e681);
b = gg(b, c, d, a, x[i+ 4], 20, 0xe7d3fbc8);
a = gg(a, b, c, d, x[i+ 9], 5 , 0x21e1cde6);
d = gg(d, a, b, c, x[i+14], 9 , 0xc33707d6);
c = gg(c, d, a, b, x[i+ 3], 14, 0xf4d50d87);
b = gg(b, c, d, a, x[i+ 8], 20, 0x455a14ed);
a = gg(a, b, c, d, x[i+13], 5 , 0xa9e3e905);
d = gg(d, a, b, c, x[i+ 2], 9 , 0xfcefa3f8);
c = gg(c, d, a, b, x[i+ 7], 14, 0x676f02d9);
b = gg(b, c, d, a, x[i+12], 20, 0x8d2a4c8a);
a = hh(a, b, c, d, x[i+ 5], 4 , 0xfffa3942);
d = hh(d, a, b, c, x[i+ 8], 11, 0x8771f681);
c = hh(c, d, a, b, x[i+11], 16, 0x6d9d6122);
b = hh(b, c, d, a, x[i+14], 23, 0xfde5380c);
a = hh(a, b, c, d, x[i+ 1], 4 , 0xa4beea44);
d = hh(d, a, b, c, x[i+ 4], 11, 0x4bdecfa9);
c = hh(c, d, a, b, x[i+ 7], 16, 0xf6bb4b60);
b = hh(b, c, d, a, x[i+10], 23, 0xbebfbc70);
a = hh(a, b, c, d, x[i+13], 4 , 0x289b7ec6);
d = hh(d, a, b, c, x[i+ 0], 11, 0xeaa127fa);
c = hh(c, d, a, b, x[i+ 3], 16, 0xd4ef3085);
b = hh(b, c, d, a, x[i+ 6], 23, 0x4881d05);
a = hh(a, b, c, d, x[i+ 9], 4 , 0xd9d4d039);
d = hh(d, a, b, c, x[i+12], 11, 0xe6db99e5);
c = hh(c, d, a, b, x[i+15], 16, 0x1fa27cf8);
b = hh(b, c, d, a, x[i+ 2], 23, 0xc4ac5665);
a = ii(a, b, c, d, x[i+ 0], 6 , 0xf4292244);
d = ii(d, a, b, c, x[i+ 7], 10, 0x432aff97);
c = ii(c, d, a, b, x[i+14], 15, 0xab9423a7);
b = ii(b, c, d, a, x[i+ 5], 21, 0xfc93a039);
a = ii(a, b, c, d, x[i+12], 6 , 0x655b59c3);
d = ii(d, a, b, c, x[i+ 3], 10, 0x8f0ccc92);
c = ii(c, d, a, b, x[i+10], 15, 0xffeff47d);
b = ii(b, c, d, a, x[i+ 1], 21, 0x85845dd1);
a = ii(a, b, c, d, x[i+ 8], 6 , 0x6fa87e4f);
d = ii(d, a, b, c, x[i+15], 10, 0xfe2ce6e0);
c = ii(c, d, a, b, x[i+ 6], 15, 0xa3014314);
b = ii(b, c, d, a, x[i+13], 21, 0x4e0811a1);
a = ii(a, b, c, d, x[i+ 4], 6 , 0xf7537e82);
d = ii(d, a, b, c, x[i+11], 10, 0xbd3af235);
c = ii(c, d, a, b, x[i+ 2], 15, 0x2ad7d2bb);
b = ii(b, c, d, a, x[i+ 9], 21, 0xeb86d391);
a += olda;
b += oldb;
c += oldc;
d += oldd;
}
return [ a, b, c, d ];
}
/*
* Bitwise rotate a 32-bit number to the left.
*/
private function rol(num:uint, cnt:uint):uint
{
return (num << cnt) | (num >>> (32 - cnt));
}
/*
* These functions implement the four basic operations the algorithm uses.
*/
private function cmn(q:uint, a:uint, b:uint, x:uint, s:uint, t:uint):uint {
return rol(a + q + x + t, s) + b;
}
private function ff(a:uint, b:uint, c:uint, d:uint, x:uint, s:uint, t:uint):uint {
return cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
private function gg(a:uint, b:uint, c:uint, d:uint, x:uint, s:uint, t:uint):uint {
return cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
private function hh(a:uint, b:uint, c:uint, d:uint, x:uint, s:uint, t:uint):uint {
return cmn(b ^ c ^ d, a, b, x, s, t);
}
private function ii(a:uint, b:uint, c:uint, d:uint, x:uint, s:uint, t:uint):uint {
return cmn(c ^ (b | (~d)), a, b, x, s, t);
}
public function toString():String {
return "md5";
}
}
}
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