
/**
 * jQuery SHA1 hash algorithm function
 * Download by http://www.codefans.net
 * 	<code>
 * 		Calculate the sha1 hash of a String 
 * 		String $.sha1 ( String str )
 * 	</code>
 * 
 * Calculates the sha1 hash of str using the US Secure Hash Algorithm 1.
 * SHA-1 the Secure Hash Algorithm (SHA) was developed by NIST and is specified in the Secure Hash Standard (SHS, FIPS 180).
 * This script is used to process variable length message into a fixed-length output using the SHA-1 algorithm. It is fully compatible with UTF-8 encoding.
 * If you plan using UTF-8 encoding in your project don't forget to set the page encoding to UTF-8 (Content-Type meta tag).
 * This function orginally get from the WebToolkit and rewrite for using as the jQuery plugin.
 * 
 * Example
 * 	Code
 * 		<code>
 * 			$.sha1("I'm Persian."); 
 * 		</code>
 * 	Result
 * 		<code>
 * 			"1d302f9dc925d62fc859055999d2052e274513ed"
 * 		</code>
 * 
 * @alias Muhammad Hussein Fattahizadeh < muhammad [AT] semnanweb [DOT] com >
 * @link http://www.semnanweb.com/jquery-plugin/sha1.html
 * @see http://www.webtoolkit.info/
 * @license http://www.gnu.org/licenses/gpl.html [GNU General Public License]
 * @param {jQuery} {sha1:function(string))
 * @return string
 */

(function($){
	
	var rotateLeft = function(lValue, iShiftBits) {
		return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));
	}
	
	var lsbHex = function(value) {
		var string = "";
		var i;
		var vh;
		var vl;
		for(i = 0;i <= 6;i += 2) {
			vh = (value>>>(i * 4 + 4))&0x0f;
			vl = (value>>>(i*4))&0x0f;
			string += vh.toString(16) + vl.toString(16);
		}
		return string;
	};
	
	var cvtHex = function(value) {
		var string = "";
		var i;
		var v;
		for(i = 7;i >= 0;i--) {
			v = (value>>>(i * 4))&0x0f;
			string += v.toString(16);
		}
		return string;
	};
	
	var uTF8Encode = function(string) {
		string = string.replace(/\x0d\x0a/g, "\x0a");
		var output = "";
		for (var n = 0; n < string.length; n++) {
			var c = string.charCodeAt(n);
			if (c < 128) {
				output += String.fromCharCode(c);
			} else if ((c > 127) && (c < 2048)) {
				output += String.fromCharCode((c >> 6) | 192);
				output += String.fromCharCode((c & 63) | 128);
			} else {
				output += String.fromCharCode((c >> 12) | 224);
				output += String.fromCharCode(((c >> 6) & 63) | 128);
				output += String.fromCharCode((c & 63) | 128);
			}
		}
		return output;
	};
	
	$.extend({
		sha1: function(string) {
			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 tempValue;
			string = uTF8Encode(string);
			var stringLength = string.length;
			var wordArray = new Array();
			for(i = 0;i < stringLength - 3;i += 4) {
				j = string.charCodeAt(i)<<24 | string.charCodeAt(i + 1)<<16 | string.charCodeAt(i + 2)<<8 | string.charCodeAt(i + 3);
				wordArray.push(j);
			}
			switch(stringLength % 4) {
				case 0:
					i = 0x080000000;
				break;
				case 1:
					i = string.charCodeAt(stringLength - 1)<<24 | 0x0800000;
				break;
				case 2:
					i = string.charCodeAt(stringLength - 2)<<24 | string.charCodeAt(stringLength - 1)<<16 | 0x08000;
				break;
				case 3:
					i = string.charCodeAt(stringLength - 3)<<24 | string.charCodeAt(stringLength - 2)<<16 | string.charCodeAt(stringLength - 1)<<8 | 0x80;
				break;
			}
			wordArray.push(i);
			while((wordArray.length % 16) != 14 ) wordArray.push(0);
			wordArray.push(stringLength>>>29);
			wordArray.push((stringLength<<3)&0x0ffffffff);
			for(blockstart = 0;blockstart < wordArray.length;blockstart += 16) {
				for(i = 0;i < 16;i++) W[i] = wordArray[blockstart+i];
				for(i = 16;i <= 79;i++) W[i] = rotateLeft(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++) {
					tempValue = (rotateLeft(A, 5) + ((B&C) | (~B&D)) + E + W[i] + 0x5A827999) & 0x0ffffffff;
					E = D;
					D = C;
					C = rotateLeft(B, 30);
					B = A;
					A = tempValue;
				}
				for(i = 20;i <= 39;i++) {
					tempValue = (rotateLeft(A, 5) + (B ^ C ^ D) + E + W[i] + 0x6ED9EBA1) & 0x0ffffffff;
					E = D;
					D = C;
					C = rotateLeft(B, 30);
					B = A;
					A = tempValue;
				}
				for(i = 40;i <= 59;i++) {
					tempValue = (rotateLeft(A, 5) + ((B&C) | (B&D) | (C&D)) + E + W[i] + 0x8F1BBCDC) & 0x0ffffffff;
					E = D;
					D = C;
					C = rotateLeft(B, 30);
					B = A;
					A = tempValue;
				}
				for(i = 60;i <= 79;i++) {
					tempValue = (rotateLeft(A, 5) + (B ^ C ^ D) + E + W[i] + 0xCA62C1D6) & 0x0ffffffff;
					E = D;
					D = C;
					C = rotateLeft(B, 30);
					B = A;
					A = tempValue;
				}
				H0 = (H0 + A) & 0x0ffffffff;
				H1 = (H1 + B) & 0x0ffffffff;
				H2 = (H2 + C) & 0x0ffffffff;
				H3 = (H3 + D) & 0x0ffffffff;
				H4 = (H4 + E) & 0x0ffffffff;
			}
			var tempValue = cvtHex(H0) + cvtHex(H1) + cvtHex(H2) + cvtHex(H3) + cvtHex(H4);
			return tempValue.toLowerCase();
		}
	});
})(jQuery);