File: chat-websocket/node_modules/socket.io/node_modules/socket.io-client/lib/vendor/web-socket-js/flash-src/com/hurlant/crypto/symmetric/CFBMode.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/CFBMode.as
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/** * CFBMode * * An ActionScript 3 implementation of the CFB confidentiality mode * Copyright (c) 2007 Henri Torgemane * * See LICENSE.txt for full license information. */ package com.hurlant.crypto.symmetric { import flash.utils.ByteArray; /** * This is the "full" CFB. * CFB1 and CFB8 are hiding somewhere else. * * Note: The constructor accepts an optional padding argument, but ignores it otherwise. */ public class CFBMode extends IVMode implements IMode { public function CFBMode(key:ISymmetricKey, padding:IPad = null) { super(key,null); } public function encrypt(src:ByteArray):void { var l:uint = src.length; var vector:ByteArray = getIV4e(); for (var i:uint=0;i<src.length;i+=blockSize) { key.encrypt(vector); var chunk:uint = (i+blockSize<l)?blockSize:l-i; for (var j:uint=0;j<chunk;j++) { src[i+j] ^= vector[j]; } vector.position=0; vector.writeBytes(src, i, chunk); } } public function decrypt(src:ByteArray):void { var l:uint = src.length; var vector:ByteArray = getIV4d(); var tmp:ByteArray = new ByteArray; for (var i:uint=0;i<src.length;i+=blockSize) { key.encrypt(vector); var chunk:uint = (i+blockSize<l)?blockSize:l-i; tmp.position=0; tmp.writeBytes(src, i, chunk); for (var j:uint=0;j<chunk;j++) { src[i+j] ^= vector[j]; } vector.position=0; vector.writeBytes(tmp); } } public function toString():String { return key.toString()+"-cfb"; } } }