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/**





*





*  Secure Hash Algorithm (SHA1)





*  http://www.webtoolkit.info/





*





**/





 





function SHA1 (msg) {





 





	function rotate_left(n,s) {





		var t4 = ( n<<s ) | (n>>>(32-s));





		return t4;





	};





 





	function lsb_hex(val) {





		var str="";





		var i;





		var vh;





		var vl;





 





		for( i=0; i<=6; i+=2 ) {





			vh = (val>>>(i*4+4))&0x0f;





			vl = (val>>>(i*4))&0x0f;





			str += vh.toString(16) + vl.toString(16);





		}





		return str;





	};





 





	function cvt_hex(val) {





		var str="";





		var i;





		var v;





 





		for( i=7; i>=0; i-- ) {





			v = (val>>>(i*4))&0x0f;





			str += v.toString(16);





		}





		return str;





	};





 





 





	function Utf8Encode(string) {





		string = string.replace(/\r\n/g,"\n");





		var utftext = "";





 





		for (var n = 0; n < string.length; n++) {





 





			var c = string.charCodeAt(n);





 





			if (c < 128) {





				utftext += String.fromCharCode(c);





			}





			else if((c > 127) && (c < 2048)) {





				utftext += String.fromCharCode((c >> 6) | 192);





				utftext += String.fromCharCode((c & 63) | 128);





			}





			else {





				utftext += String.fromCharCode((c >> 12) | 224);





				utftext += String.fromCharCode(((c >> 6) & 63) | 128);





				utftext += String.fromCharCode((c & 63) | 128);





			}





 





		}





 





		return utftext;





	};





 





	var blockstart;





	var i, j;





	var W = new Array(80);





	var H0 = 0x67452301;





	var H1 = 0xEFCDAB89;





	var H2 = 0x98BADCFE;





	var H3 = 0x10325476;





	var H4 = 0xC3D2E1F0;





	var A, B, C, D, E;





	var temp;





 





	msg = Utf8Encode(msg);





 





	var msg_len = msg.length;





 





	var word_array = new Array();





	for( i=0; i<msg_len-3; i+=4 ) {





		j = msg.charCodeAt(i)<<24 | msg.charCodeAt(i+1)<<16 |





		msg.charCodeAt(i+2)<<8 | msg.charCodeAt(i+3);





		word_array.push( j );





	}





 





	switch( msg_len % 4 ) {





		case 0:





			i = 0x080000000;





		break;





		case 1:





			i = msg.charCodeAt(msg_len-1)<<24 | 0x0800000;





		break;





 





		case 2:





			i = msg.charCodeAt(msg_len-2)<<24 | msg.charCodeAt(msg_len-1)<<16 | 0x08000;





		break;





 





		case 3:





			i = msg.charCodeAt(msg_len-3)<<24 | msg.charCodeAt(msg_len-2)<<16 | msg.charCodeAt(msg_len-1)<<8	| 0x80;





		break;





	}





 





	word_array.push( i );





 





	while( (word_array.length % 16) != 14 ) word_array.push( 0 );





 





	word_array.push( msg_len>>>29 );





	word_array.push( (msg_len<<3)&0x0ffffffff );





 





 





	for ( blockstart=0; blockstart<word_array.length; blockstart+=16 ) {





 





		for( i=0; i<16; i++ ) W[i] = word_array[blockstart+i];





		for( i=16; i<=79; i++ ) W[i] = rotate_left(W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16], 1);





 





		A = H0;





		B = H1;





		C = H2;





		D = H3;





		E = H4;





 





		for( i= 0; i<=19; i++ ) {





			temp = (rotate_left(A,5) + ((B&C) | (~B&D)) + E + W[i] + 0x5A827999) & 0x0ffffffff;





			E = D;





			D = C;





			C = rotate_left(B,30);





			B = A;





			A = temp;





		}





 





		for( i=20; i<=39; i++ ) {





			temp = (rotate_left(A,5) + (B ^ C ^ D) + E + W[i] + 0x6ED9EBA1) & 0x0ffffffff;





			E = D;





			D = C;





			C = rotate_left(B,30);





			B = A;





			A = temp;





		}





 





		for( i=40; i<=59; i++ ) {





			temp = (rotate_left(A,5) + ((B&C) | (B&D) | (C&D)) + E + W[i] + 0x8F1BBCDC) & 0x0ffffffff;





			E = D;





			D = C;





			C = rotate_left(B,30);





			B = A;





			A = temp;





		}





 





		for( i=60; i<=79; i++ ) {





			temp = (rotate_left(A,5) + (B ^ C ^ D) + E + W[i] + 0xCA62C1D6) & 0x0ffffffff;





			E = D;





			D = C;





			C = rotate_left(B,30);





			B = A;





			A = temp;





		}





 





		H0 = (H0 + A) & 0x0ffffffff;





		H1 = (H1 + B) & 0x0ffffffff;





		H2 = (H2 + C) & 0x0ffffffff;





		H3 = (H3 + D) & 0x0ffffffff;





		H4 = (H4 + E) & 0x0ffffffff;





 





	}





 





	var temp = cvt_hex(H0) + cvt_hex(H1) + cvt_hex(H2) + cvt_hex(H3) + cvt_hex(H4);





 





	return temp.toLowerCase();





 





}