File: chat-websocket/node_modules/socket.io/node_modules/socket.io-client/lib/vendor/web-socket-js/flash-src/com/hurlant/crypto/symmetric/CTRMode.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/CTRMode.as
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/** * CTRMode * * An ActionScript 3 implementation of the counter confidentiality mode * Copyright (c) 2007 Henri Torgemane * * See LICENSE.txt for full license information. */ package com.hurlant.crypto.symmetric { import flash.utils.ByteArray; public class CTRMode extends IVMode implements IMode { public function CTRMode(key:ISymmetricKey, padding:IPad = null) { super(key, padding); } public function encrypt(src:ByteArray):void { padding.pad(src); var vector:ByteArray = getIV4e(); core(src, vector); } public function decrypt(src:ByteArray):void { var vector:ByteArray = getIV4d(); core(src, vector); padding.unpad(src); } private function core(src:ByteArray, iv:ByteArray):void { var X:ByteArray = new ByteArray; var Xenc:ByteArray = new ByteArray; X.writeBytes(iv); for (var i:uint=0;i<src.length;i+=blockSize) { Xenc.position=0; Xenc.writeBytes(X); key.encrypt(Xenc); for (var j:uint=0;j<blockSize;j++) { src[i+j] ^= Xenc[j]; } for (j=blockSize-1;j>=0;--j) { X[j]++; if (X[j]!=0) break; } } } public function toString():String { return key.toString()+"-ctr"; } } }