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1;(function (root, factory, undef) {2	if (typeof exports === "object") {3		// CommonJS4		module.exports = exports = factory(require("./core"), require("./cipher-core"));5	}6	else if (typeof define === "function" && define.amd) {7		// AMD8		define(["./core", "./cipher-core"], factory);9	}10	else {11		// Global (browser)12		factory(root.CryptoJS);13	}14}(this, function (CryptoJS) {15 16	/**17	 * Output Feedback block mode.18	 */19	CryptoJS.mode.OFB = (function () {20	    var OFB = CryptoJS.lib.BlockCipherMode.extend();21 22	    var Encryptor = OFB.Encryptor = OFB.extend({23	        processBlock: function (words, offset) {24	            // Shortcuts25	            var cipher = this._cipher26	            var blockSize = cipher.blockSize;27	            var iv = this._iv;28	            var keystream = this._keystream;29 30	            // Generate keystream31	            if (iv) {32	                keystream = this._keystream = iv.slice(0);33 34	                // Remove IV for subsequent blocks35	                this._iv = undefined;36	            }37	            cipher.encryptBlock(keystream, 0);38 39	            // Encrypt40	            for (var i = 0; i < blockSize; i++) {41	                words[offset + i] ^= keystream[i];42	            }43	        }44	    });45 46	    OFB.Decryptor = Encryptor;47 48	    return OFB;49	}());50 51 52	return CryptoJS.mode.OFB;53 54}));