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/var/runtime/node_modules/@aws-sdk/node_modules/crypto-js

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mode-cfb.js2.1 KB · 80 lines
;(function (root, factory, undef) {	if (typeof exports === "object") {		// CommonJS		module.exports = exports = factory(require("./core"), require("./cipher-core"));	}	else if (typeof define === "function" && define.amd) {		// AMD		define(["./core", "./cipher-core"], factory);	}	else {		// Global (browser)		factory(root.CryptoJS);	}}(this, function (CryptoJS) { 	/**	 * Cipher Feedback block mode.	 */	CryptoJS.mode.CFB = (function () {	    var CFB = CryptoJS.lib.BlockCipherMode.extend(); 	    CFB.Encryptor = CFB.extend({	        processBlock: function (words, offset) {	            // Shortcuts	            var cipher = this._cipher;	            var blockSize = cipher.blockSize; 	            generateKeystreamAndEncrypt.call(this, words, offset, blockSize, cipher); 	            // Remember this block to use with next block	            this._prevBlock = words.slice(offset, offset + blockSize);	        }	    }); 	    CFB.Decryptor = CFB.extend({	        processBlock: function (words, offset) {	            // Shortcuts	            var cipher = this._cipher;	            var blockSize = cipher.blockSize; 	            // Remember this block to use with next block	            var thisBlock = words.slice(offset, offset + blockSize); 	            generateKeystreamAndEncrypt.call(this, words, offset, blockSize, cipher); 	            // This block becomes the previous block	            this._prevBlock = thisBlock;	        }	    }); 	    function generateKeystreamAndEncrypt(words, offset, blockSize, cipher) {	        var keystream; 	        // Shortcut	        var iv = this._iv; 	        // Generate keystream	        if (iv) {	            keystream = iv.slice(0); 	            // Remove IV for subsequent blocks	            this._iv = undefined;	        } else {	            keystream = this._prevBlock;	        }	        cipher.encryptBlock(keystream, 0); 	        // Encrypt	        for (var i = 0; i < blockSize; i++) {	            words[offset + i] ^= keystream[i];	        }	    } 	    return CFB;	}());  	return CryptoJS.mode.CFB; }));