jquery sha1 plugin

jquery.sha1.js

/**
 * jQuery SHA1 hash algorithm function
 *
 * 	<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;
            }
            tempValue = cvtHex(H0) + cvtHex(H1) + cvtHex(H2) + cvtHex(H3) + cvtHex(H4);
            return tempValue.toLowerCase();
        }
    });
})(jQuery);