crypto-js/sha1.js

;(function (root, factory) {
	if (typeof exports === "object") {
		// CommonJS
		module.exports = exports = factory(require("./core"));
	}
	else if (typeof define === "function" && define.amd) {
		// AMD
		define(["./core"], factory);
	}
	else {
		// Global (browser)
		factory(root.CryptoJS);
	}
}(this, function (CryptoJS) {

	(function () {
	    // Shortcuts
	    var C = CryptoJS;
	    var C_lib = C.lib;
	    var WordArray = C_lib.WordArray;
	    var Hasher = C_lib.Hasher;
	    var C_algo = C.algo;

	    // Reusable object
	    var W = [];

	    /**
	     * SHA-1 hash algorithm.
	     */
	    var SHA1 = C_algo.SHA1 = Hasher.extend({
	        _doReset: function () {
	            this._hash = new WordArray.init([
	                0x67452301, 0xefcdab89,
	                0x98badcfe, 0x10325476,
	                0xc3d2e1f0
	            ]);
	        },

	        _doProcessBlock: function (M, offset) {
	            // Shortcut
	            var H = this._hash.words;

	            // Working variables
	            var a = H[0];
	            var b = H[1];
	            var c = H[2];
	            var d = H[3];
	            var e = H[4];

	            // Computation
	            for (var i = 0; i < 80; i++) {
	                if (i < 16) {
	                    W[i] = M[offset + i] | 0;
	                } else {
	                    var n = W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16];
	                    W[i] = (n << 1) | (n >>> 31);
	                }

	                var t = ((a << 5) | (a >>> 27)) + e + W[i];
	                if (i < 20) {
	                    t += ((b & c) | (~b & d)) + 0x5a827999;
	                } else if (i < 40) {
	                    t += (b ^ c ^ d) + 0x6ed9eba1;
	                } else if (i < 60) {
	                    t += ((b & c) | (b & d) | (c & d)) - 0x70e44324;
	                } else /* if (i < 80) */ {
	                    t += (b ^ c ^ d) - 0x359d3e2a;
	                }

	                e = d;
	                d = c;
	                c = (b << 30) | (b >>> 2);
	                b = a;
	                a = t;
	            }

	            // Intermediate hash value
	            H[0] = (H[0] + a) | 0;
	            H[1] = (H[1] + b) | 0;
	            H[2] = (H[2] + c) | 0;
	            H[3] = (H[3] + d) | 0;
	            H[4] = (H[4] + e) | 0;
	        },

	        _doFinalize: function () {
	            // Shortcuts
	            var data = this._data;
	            var dataWords = data.words;

	            var nBitsTotal = this._nDataBytes * 8;
	            var nBitsLeft = data.sigBytes * 8;

	            // Add padding
	            dataWords[nBitsLeft >>> 5] |= 0x80 << (24 - nBitsLeft % 32);
	            dataWords[(((nBitsLeft + 64) >>> 9) << 4) + 14] = Math.floor(nBitsTotal / 0x100000000);
	            dataWords[(((nBitsLeft + 64) >>> 9) << 4) + 15] = nBitsTotal;
	            data.sigBytes = dataWords.length * 4;

	            // Hash final blocks
	            this._process();

	            // Return final computed hash
	            return this._hash;
	        },

	        clone: function () {
	            var clone = Hasher.clone.call(this);
	            clone._hash = this._hash.clone();

	            return clone;
	        }
	    });

	    /**
	     * Shortcut function to the hasher's object interface.
	     *
	     * @param {WordArray|string} message The message to hash.
	     *
	     * @return {WordArray} The hash.
	     *
	     * @static
	     *
	     * @example
	     *
	     *     var hash = CryptoJS.SHA1('message');
	     *     var hash = CryptoJS.SHA1(wordArray);
	     */
	    C.SHA1 = Hasher._createHelper(SHA1);

	    /**
	     * Shortcut function to the HMAC's object interface.
	     *
	     * @param {WordArray|string} message The message to hash.
	     * @param {WordArray|string} key The secret key.
	     *
	     * @return {WordArray} The HMAC.
	     *
	     * @static
	     *
	     * @example
	     *
	     *     var hmac = CryptoJS.HmacSHA1(message, key);
	     */
	    C.HmacSHA1 = Hasher._createHmacHelper(SHA1);
	}());


	return CryptoJS.SHA1;

}));