创建

node_modules/crypto-js/mode-cfb.js

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+;(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;
+
+}));