File: chat-websocket/node_modules/socket.io/node_modules/socket.io-client/lib/vendor/web-socket-js/flash-src/com/hurlant/crypto/symmetric/CFB8Mode.as

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File: chat-websocket/node_modules/socket.io/node_modules/socket.io-client/lib/vendor/web-socket-js/flash-src/com/hurlant/crypto/symmetric/CFB8Mode.as
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/** * CFB8Mode * * An ActionScript 3 implementation of the CFB-8 confidentiality mode * Copyright (c) 2007 Henri Torgemane * * See LICENSE.txt for full license information. */ package com.hurlant.crypto.symmetric { import com.hurlant.crypto.tests.TestCase; import flash.utils.ByteArray; /** * * Note: The constructor accepts an optional padding argument, but ignores it otherwise. */ public class CFB8Mode extends IVMode implements IMode { public function CFB8Mode(key:ISymmetricKey, padding:IPad = null) { super(key, null); } public function encrypt(src:ByteArray):void { var vector:ByteArray = getIV4e(); var tmp:ByteArray = new ByteArray; for (var i:uint=0;i<src.length;i++) { tmp.position = 0; tmp.writeBytes(vector); key.encrypt(vector); src[i] ^= vector[0]; // rotate for (var j:uint=0;j<blockSize-1;j++) { vector[j] = tmp[j+1]; } vector[blockSize-1] = src[i]; } } public function decrypt(src:ByteArray):void { var vector:ByteArray = getIV4d(); var tmp:ByteArray = new ByteArray; for (var i:uint=0;i<src.length;i++) { var c:uint = src[i]; tmp.position = 0; tmp.writeBytes(vector); // I <- tmp key.encrypt(vector); // O <- vector src[i] ^= vector[0]; // rotate for (var j:uint=0;j<blockSize-1;j++) { vector[j] = tmp[j+1]; } vector[blockSize-1] = c; } } public function toString():String { return key.toString()+"-cfb8"; } } }