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1;(function (root, factory, undef) {2	if (typeof exports === "object") {3		// CommonJS4		module.exports = exports = factory(require("./core"), require("./enc-base64"), require("./md5"), require("./evpkdf"), require("./cipher-core"));5	}6	else if (typeof define === "function" && define.amd) {7		// AMD8		define(["./core", "./enc-base64", "./md5", "./evpkdf", "./cipher-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 StreamCipher = C_lib.StreamCipher;21	    var C_algo = C.algo;22 23	    /**24	     * RC4 stream cipher algorithm.25	     */26	    var RC4 = C_algo.RC4 = StreamCipher.extend({27	        _doReset: function () {28	            // Shortcuts29	            var key = this._key;30	            var keyWords = key.words;31	            var keySigBytes = key.sigBytes;32 33	            // Init sbox34	            var S = this._S = [];35	            for (var i = 0; i < 256; i++) {36	                S[i] = i;37	            }38 39	            // Key setup40	            for (var i = 0, j = 0; i < 256; i++) {41	                var keyByteIndex = i % keySigBytes;42	                var keyByte = (keyWords[keyByteIndex >>> 2] >>> (24 - (keyByteIndex % 4) * 8)) & 0xff;43 44	                j = (j + S[i] + keyByte) % 256;45 46	                // Swap47	                var t = S[i];48	                S[i] = S[j];49	                S[j] = t;50	            }51 52	            // Counters53	            this._i = this._j = 0;54	        },55 56	        _doProcessBlock: function (M, offset) {57	            M[offset] ^= generateKeystreamWord.call(this);58	        },59 60	        keySize: 256/32,61 62	        ivSize: 063	    });64 65	    function generateKeystreamWord() {66	        // Shortcuts67	        var S = this._S;68	        var i = this._i;69	        var j = this._j;70 71	        // Generate keystream word72	        var keystreamWord = 0;73	        for (var n = 0; n < 4; n++) {74	            i = (i + 1) % 256;75	            j = (j + S[i]) % 256;76 77	            // Swap78	            var t = S[i];79	            S[i] = S[j];80	            S[j] = t;81 82	            keystreamWord |= S[(S[i] + S[j]) % 256] << (24 - n * 8);83	        }84 85	        // Update counters86	        this._i = i;87	        this._j = j;88 89	        return keystreamWord;90	    }91 92	    /**93	     * Shortcut functions to the cipher's object interface.94	     *95	     * @example96	     *97	     *     var ciphertext = CryptoJS.RC4.encrypt(message, key, cfg);98	     *     var plaintext  = CryptoJS.RC4.decrypt(ciphertext, key, cfg);99	     */100	    C.RC4 = StreamCipher._createHelper(RC4);101 102	    /**103	     * Modified RC4 stream cipher algorithm.104	     */105	    var RC4Drop = C_algo.RC4Drop = RC4.extend({106	        /**107	         * Configuration options.108	         *109	         * @property {number} drop The number of keystream words to drop. Default 192110	         */111	        cfg: RC4.cfg.extend({112	            drop: 192113	        }),114 115	        _doReset: function () {116	            RC4._doReset.call(this);117 118	            // Drop119	            for (var i = this.cfg.drop; i > 0; i--) {120	                generateKeystreamWord.call(this);121	            }122	        }123	    });124 125	    /**126	     * Shortcut functions to the cipher's object interface.127	     *128	     * @example129	     *130	     *     var ciphertext = CryptoJS.RC4Drop.encrypt(message, key, cfg);131	     *     var plaintext  = CryptoJS.RC4Drop.decrypt(ciphertext, key, cfg);132	     */133	    C.RC4Drop = StreamCipher._createHelper(RC4Drop);134	}());135 136 137	return CryptoJS.RC4;138 139}));