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1;(function (root, factory) {2	if (typeof exports === "object") {3		// CommonJS4		module.exports = exports = factory(require("./core"));5	}6	else if (typeof define === "function" && define.amd) {7		// AMD8		define(["./core"], factory);9	}10	else {11		// Global (browser)12		factory(root.CryptoJS);13	}14}(this, function (CryptoJS) {15 16	(function () {17	    // Shortcuts18	    var C = CryptoJS;19	    var C_lib = C.lib;20	    var Base = C_lib.Base;21	    var C_enc = C.enc;22	    var Utf8 = C_enc.Utf8;23	    var C_algo = C.algo;24 25	    /**26	     * HMAC algorithm.27	     */28	    var HMAC = C_algo.HMAC = Base.extend({29	        /**30	         * Initializes a newly created HMAC.31	         *32	         * @param {Hasher} hasher The hash algorithm to use.33	         * @param {WordArray|string} key The secret key.34	         *35	         * @example36	         *37	         *     var hmacHasher = CryptoJS.algo.HMAC.create(CryptoJS.algo.SHA256, key);38	         */39	        init: function (hasher, key) {40	            // Init hasher41	            hasher = this._hasher = new hasher.init();42 43	            // Convert string to WordArray, else assume WordArray already44	            if (typeof key == 'string') {45	                key = Utf8.parse(key);46	            }47 48	            // Shortcuts49	            var hasherBlockSize = hasher.blockSize;50	            var hasherBlockSizeBytes = hasherBlockSize * 4;51 52	            // Allow arbitrary length keys53	            if (key.sigBytes > hasherBlockSizeBytes) {54	                key = hasher.finalize(key);55	            }56 57	            // Clamp excess bits58	            key.clamp();59 60	            // Clone key for inner and outer pads61	            var oKey = this._oKey = key.clone();62	            var iKey = this._iKey = key.clone();63 64	            // Shortcuts65	            var oKeyWords = oKey.words;66	            var iKeyWords = iKey.words;67 68	            // XOR keys with pad constants69	            for (var i = 0; i < hasherBlockSize; i++) {70	                oKeyWords[i] ^= 0x5c5c5c5c;71	                iKeyWords[i] ^= 0x36363636;72	            }73	            oKey.sigBytes = iKey.sigBytes = hasherBlockSizeBytes;74 75	            // Set initial values76	            this.reset();77	        },78 79	        /**80	         * Resets this HMAC to its initial state.81	         *82	         * @example83	         *84	         *     hmacHasher.reset();85	         */86	        reset: function () {87	            // Shortcut88	            var hasher = this._hasher;89 90	            // Reset91	            hasher.reset();92	            hasher.update(this._iKey);93	        },94 95	        /**96	         * Updates this HMAC with a message.97	         *98	         * @param {WordArray|string} messageUpdate The message to append.99	         *100	         * @return {HMAC} This HMAC instance.101	         *102	         * @example103	         *104	         *     hmacHasher.update('message');105	         *     hmacHasher.update(wordArray);106	         */107	        update: function (messageUpdate) {108	            this._hasher.update(messageUpdate);109 110	            // Chainable111	            return this;112	        },113 114	        /**115	         * Finalizes the HMAC computation.116	         * Note that the finalize operation is effectively a destructive, read-once operation.117	         *118	         * @param {WordArray|string} messageUpdate (Optional) A final message update.119	         *120	         * @return {WordArray} The HMAC.121	         *122	         * @example123	         *124	         *     var hmac = hmacHasher.finalize();125	         *     var hmac = hmacHasher.finalize('message');126	         *     var hmac = hmacHasher.finalize(wordArray);127	         */128	        finalize: function (messageUpdate) {129	            // Shortcut130	            var hasher = this._hasher;131 132	            // Compute HMAC133	            var innerHash = hasher.finalize(messageUpdate);134	            hasher.reset();135	            var hmac = hasher.finalize(this._oKey.clone().concat(innerHash));136 137	            return hmac;138	        }139	    });140	}());141 142 143}));