/**
 * @function :MD5
 * 
 * @author :Makenna
 * 
 * @date : 2014-4-10
 */

package
{
    public class Md5Util{
		
        public function Md5Util(){}
		
        public static var hexcase:Number = 0;
        public static var b64pad:String = "";
        public static var chrsz:Number = 8;
        
        public static function calculate(s:*):*{ return hex_md5(s); };
     	public static function hex_hmac_md5(key:*, data:*):*{ return binl2hex(core_hmac_md5(key, data)); }
        public static function b64_hmac_md5(key:*, data:*):*{ return binl2b64(core_hmac_md5(key, data)); }
        public static function str_hmac_md5(key:*, data:*):*{ return binl2str(core_hmac_md5(key, data)); }
        
        private static function hex_md5(s:*):*{ return binl2hex(core_md5(str2binl(s), s.length*chrsz)); }
        private static function b64_md5(s:*):*{ return binl2b64(core_md5(str2binl(s), s.length*chrsz)); }
        private static function str_md5(s:*):*{ return binl2str(core_md5(str2binl(s), s.length*chrsz)); }
        private static function core_md5(x:*,len:*):* {
            x[len >> 5] |= 0x80 << ((len)%32); x[(((len+64) >>> 9) << 4)+14] = len;
            var a:* = 1732584193; var b:* = -271733879; var c:* = -1732584194; var d:* = 271733878;
            for (var i:* = 0; i<x.length; i += 16) {
                var olda:* = a; var oldb:* = b; var oldc:* = c; var oldd:* = d;
                a = md5_ff(a, b, c, d, x[i+0], 7, -680876936);
                d = md5_ff(d, a, b, c, x[i+1], 12, -389564586);
                c = md5_ff(c, d, a, b, x[i+2], 17, 606105819);
                b = md5_ff(b, c, d, a, x[i+3], 22, -1044525330);
                a = md5_ff(a, b, c, d, x[i+4], 7, -176418897);
                d = md5_ff(d, a, b, c, x[i+5], 12, 1200080426);
                c = md5_ff(c, d, a, b, x[i+6], 17, -1473231341);
                b = md5_ff(b, c, d, a, x[i+7], 22, -45705983);
                a = md5_ff(a, b, c, d, x[i+8], 7, 1770035416);
                d = md5_ff(d, a, b, c, x[i+9], 12, -1958414417);
                c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
                b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
                a = md5_ff(a, b, c, d, x[i+12], 7, 1804603682);
                d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
                c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
                b = md5_ff(b, c, d, a, x[i+15], 22, 1236535329);
                a = md5_gg(a, b, c, d, x[i+1], 5, -165796510);
                d = md5_gg(d, a, b, c, x[i+6], 9, -1069501632);
                c = md5_gg(c, d, a, b, x[i+11], 14, 643717713);
                b = md5_gg(b, c, d, a, x[i+0], 20, -373897302);
                a = md5_gg(a, b, c, d, x[i+5], 5, -701558691);
                d = md5_gg(d, a, b, c, x[i+10], 9, 38016083);
                c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
                b = md5_gg(b, c, d, a, x[i+4], 20, -405537848);
                a = md5_gg(a, b, c, d, x[i+9], 5, 568446438);
                d = md5_gg(d, a, b, c, x[i+14], 9, -1019803690);
                c = md5_gg(c, d, a, b, x[i+3], 14, -187363961);
                b = md5_gg(b, c, d, a, x[i+8], 20, 1163531501);
                a = md5_gg(a, b, c, d, x[i+13], 5, -1444681467);
                d = md5_gg(d, a, b, c, x[i+2], 9, -51403784);
                c = md5_gg(c, d, a, b, x[i+7], 14, 1735328473);
                b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
                a = md5_hh(a, b, c, d, x[i+5], 4, -378558);
                d = md5_hh(d, a, b, c, x[i+8], 11, -2022574463);
                c = md5_hh(c, d, a, b, x[i+11], 16, 1839030562);
                b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
                a = md5_hh(a, b, c, d, x[i+1], 4, -1530992060);
                d = md5_hh(d, a, b, c, x[i+4], 11, 1272893353);
                c = md5_hh(c, d, a, b, x[i+7], 16, -155497632);
                b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
                a = md5_hh(a, b, c, d, x[i+13], 4, 681279174);
                d = md5_hh(d, a, b, c, x[i+0], 11, -358537222);
                c = md5_hh(c, d, a, b, x[i+3], 16, -722521979);
                b = md5_hh(b, c, d, a, x[i+6], 23, 76029189);
                a = md5_hh(a, b, c, d, x[i+9], 4, -640364487);
                d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
                c = md5_hh(c, d, a, b, x[i+15], 16, 530742520);
                b = md5_hh(b, c, d, a, x[i+2], 23, -995338651);
                a = md5_ii(a, b, c, d, x[i+0], 6, -198630844);
                d = md5_ii(d, a, b, c, x[i+7], 10, 1126891415);
                c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
                b = md5_ii(b, c, d, a, x[i+5], 21, -57434055);
                a = md5_ii(a, b, c, d, x[i+12], 6, 1700485571);
                d = md5_ii(d, a, b, c, x[i+3], 10, -1894986606);
                c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
                b = md5_ii(b, c, d, a, x[i+1], 21, -2054922799);
                a = md5_ii(a, b, c, d, x[i+8], 6, 1873313359);
                d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
                c = md5_ii(c, d, a, b, x[i+6], 15, -1560198380);
                b = md5_ii(b, c, d, a, x[i+13], 21, 1309151649);
                a = md5_ii(a, b, c, d, x[i+4], 6, -145523070);
                d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
                c = md5_ii(c, d, a, b, x[i+2], 15, 718787259);
                b = md5_ii(b, c, d, a, x[i+9], 21, -343485551);
                a = safe_add(a, olda); b = safe_add(b, oldb);
                c = safe_add(c, oldc); d = safe_add(d, oldd);
            } return new Array(a, b, c, d);
        }
        private static function md5_cmn(q:*,a:*,b:*,x:*,s:*,t:*):*{ 
			return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);
		}
        private static function md5_ff(a:*,b:*,c:*,d:*,x:*,s:*,t:*):*{ 
			return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t); 
		}
        private static function md5_gg(a:*,b:*,c:*,d:*,x:*,s:*,t:*):*{ 
			return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t); 
		}
        private static function md5_hh(a:*,b:*,c:*,d:*,x:*,s:*,t:*):*{ 
			return md5_cmn(b ^ c ^ d, a, b, x, s, t); 
		}
        private static function md5_ii(a:*,b:*,c:*,d:*,x:*,s:*,t:*):*{ return md5_cmn(c ^ (b | (~d)), a, b, x, s, t); }
        private static function bit_rol(num:*,cnt:*):*{ return (num << cnt) | (num >>> (32-cnt)); }
        private static function safe_add(x:*,y:*):*{
            var lsw:* = (x & 0xFFFF)+(y & 0xFFFF); 
            var msw:* = (x >> 16)+(y >> 16)+(lsw >> 16);
            return (msw << 16) | (lsw & 0xFFFF);
        }
        private static function str2binl(str:*):*{
            var bin:Array = new Array(); 
            var mask:* = (1 << chrsz)-1;
            for (var i:int = 0; i<str.length*chrsz; i += chrsz) bin[i >> 5] |= (str[(i/chrsz)] & mask) << (i%32);
            return bin;
        }
        private static function binl2hex(binarray:*):*{
            var hex_tab:String = hexcase ? "0123456789ABCDEF" : "0123456789abcdef"; 
            var str:String = "";
            for (var i:int = 0; i<binarray.length*4; i++) {
                str += hex_tab.charAt((binarray[i >> 2] >> ((i%4)*8+4)) & 0xF)+hex_tab.charAt((binarray[i >> 2] >> ((i%4)*8)) & 0xF);
            } return str;
        }
        private static function core_hmac_md5(key:*,data:*):*{
            var bkey:* = str2binl(key);
            if (bkey.length>16) bkey = core_md5(bkey, key.length*chrsz);
            var ipad:* = new Array(16)
            var opad:* = new Array(16);
            for (var i:int = 0; i<16; i++) {
                ipad = bkey ^ 0x36363636; 
                opad = bkey ^ 0x5C5C5C5C;
            }
            var hash:* = core_md5(ipad.concat(str2binl(data)), 512+data.length*chrsz);
            return core_md5(opad.concat(hash), 512+128);
        }
        private static function binl2str(bin:*):*{
            var str:String = "";
            var mask:* = (1 << chrsz)-1;
            for (var i:int = 0; i<bin.length*32; i += chrsz) str += String.fromCharCode((bin[i >> 5] >>> (i%32)) & mask);
            return str;
        }
    
        private static function binl2b64(binarray:*):*{
            var tab:String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 
            var str:String = "";
            for (var i:int = 0; i<binarray.length*4; i += 3) {
                var triplet:* = (((binarray[i >> 2] >> 8*(i%4)) & 0xFF) << 16) | (((binarray[i+1 >> 2] >> 8*((i+1)%4)) & 0xFF) << 8) | ((binarray[i+2 >> 2] >> 8*((i+2)%4)) & 0xFF);
                for (var j:int = 0; j<4; j++) {
                    if (i*8+j*6>binarray.length*32) str += b64pad;
                    else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
                }
            }return str;
        }
    }
}