问题描述
我有一个使用对称加密来加密和解密数据的算法.无论如何,当我要解密时,我有:
I have an algorithm for encrypting and decrypting data using symmetric encryption. anyways when I am about to decrypt, I have:
CryptoStream cs = new CryptoStream(ms, cryptoTransform, CryptoStreamMode.Read);
我必须从 cs CryptoStream 读取数据并将该数据放入一个字节数组中.所以一种方法可能是:
I have to read data from the cs CryptoStream and place that data into a array of bytes. So one method could be:
System.Collections.Generic.List<byte> myListOfBytes = new System.Collections.Generic.List<byte>(); while (true) { int nextByte = cs.ReadByte(); if (nextByte == -1) break; myListOfBytes.Add((Byte)nextByte); } return myListOfBytes.ToArray();
另一种技术可能是:
ArrayList chuncks = new ArrayList(); byte[] tempContainer = new byte[1048576]; int tempBytes = 0; while (tempBytes < 1048576) { tempBytes = cs.Read(tempContainer, 0, tempContainer.Length); //tempBytes is the number of bytes read from cs stream. those bytes are placed // on the tempContainer array chuncks.Add(tempContainer); } // later do a for each loop on chunks and add those bytes
我无法提前知道流 cs 的长度:
I cannot know in advance the length of the stream cs:
或者我应该实现我的堆栈类.我将加密很多信息,因此使此代码高效将节省大量时间
or perhaps I should implement my stack class. I will be encrypting a lot of information therefore making this code efficient will save a lot of time
推荐答案
你可以分块阅读:
using (var stream = new MemoryStream()) { byte[] buffer = new byte[2048]; // read in chunks of 2KB int bytesRead; while((bytesRead = cs.Read(buffer, 0, buffer.Length)) > 0) { stream.Write(buffer, 0, bytesRead); } byte[] result = stream.ToArray(); // TODO: do something with the result }