• Cryptostream To Memorystream
• Encrypt Decrypt

Introduction Encryption in C# is a lot easier using the standard components provided by the.NET framework. In this article, I will explain how it works.NET provides us with a standard set of cryptography providers. These are samples of standard cryptography providers:. Rijndael. RSA. DES. DSA.

TripleDES These cryptography providers can be used in combination with the CryptoStream class. This class can encrypt/decrypt data on the fly from an underlying stream. You can link up almost any stream to the CryptoStream, as long as it supports the standard stream functionality defined in the Stream base class.

Initializes a new instance of the CryptoStream class with a target data stream, the transformation to use, and the mode of the stream. Using CryptoStream in C#. This class can encrypt/decrypt data on the fly from an. If you combine these parts into a CryptoStream, you can encrypt/decrypt on.

Cryptostream To Memorystream

Encrypt Decrypt

How to use CryptoStream It’s pretty straightforward. First, you need a base stream which you will use as buffer for the encryption/decryption. You also need a cryptographic transformer which is part of the CryptographicServiceProvider class. If you combine these parts into a CryptoStream, you can encrypt/decrypt on the fly.

The following example explains best how the whole process of encryption works: FileStream stream = new FileStream( ' C: test.txt', FileMode.OpenOrCreate,FileAccess.Write); DESCryptoServiceProvider cryptic = new DESCryptoServiceProvider; cryptic.Key = ASCIIEncoding.ASCII.GetBytes( ' ABCDEFGH'); cryptic.IV = ASCIIEncoding.ASCII.GetBytes( ' ABCDEFGH'); CryptoStream crStream = new CryptoStream(stream, cryptic.CreateEncryptor,CryptoStreamMode.Write); byte data = ASCIIEncoding.ASCII.GetBytes( ' Hello World!' ); crStream.Write(data, 0,data.Length); crStream.Close; stream.Close; The key and the initialization vector must be 8 characters long, that is 64 bits. This is because the DES cryptography provider uses a 64 bit key to encrypt data. If you use other algorithms for your CryptoStream, you will probably need another key size. Check the documentation on how large the key and the IV must be. We could also decrypt data using CryptoStream.

Bollwerkj 25-Aug-08 5:10 25-Aug-08 5:10 Have you attempted using CryptoStream using C/CLI? I can't get it to compile. Here's my code: array^ key; array iv; String^ file = 'C: CryptoTest crypto'; FileStream^ fs = gcnew FileStream(file, FileMode::OpenCreate); Rijndael^ rj = gcnew RijndaelManaged; CryptoStream^ cs = gcnew CryptoStream(fs, rj-CreateEncryptor(key, iv), CryptoStreamMode::Write); The error if '. Cannot convert parameter 1 from 'cli::array^' to cli::array^' If you are familiar with C/CLI, can you tell me what I'm missing.

Mube.co.uk 30-Apr-06 4:44 30-Apr-06 4:44 Thanks for the code, just what I needed to get me started encrypting data files combined with the CryptoNet tutorial also on Code Project. Code useage for data file encryption is mentioned within the other tutorial but is poorly explained. Last Visit: 31-Dec-99 19:00 Last Update: 14-Feb-18 16:21 1 General News Suggestion Question Bug Answer Joke Praise Rant Admin Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.