Implementing ECB Encryption with the Marshall C # Library

Hello! Increasingly, I meet the questions of friends and colleagues, and just requests on the topic “how to implement C # encryption”. So who will be interested to tell how this can be implemented.
ECB mode is a block cipher application method that allows you to convert a sequence of open data blocks into a sequence of encrypted data blocks. More precisely you can find out on wikipedia. I will go to the essence of the question.

For example, we have a file that needs to be encrypted. The first thing that comes to mind: there must be a function that takes a file or a path to it as an argument. Call this function _CRYPTO:

static void CRYPTO(string f) { string H = File.ReadAllText(f); FileStream FILE = File.Open(f, FileMode.Open); byte[] Key = Encoding.Default.GetBytes("key12345678"); Array.Resize(ref Key, 16); RijndaelManaged RMCrypto = new RijndaelManaged(); RMCrypto.Mode = CipherMode.ECB; RMCrypto.Padding = PaddingMode.Zeros; RMCrypto.KeySize = 128; RMCrypto.Key = Key; ICryptoTransform Encryptor = RMCrypto.CreateEncryptor(); CryptoStream Crypt = new CryptoStream(FILE, Encryptor, CryptoStreamMode.Write); using (StreamWriter sw = new StreamWriter(Crypt, Encoding.Unicode)) { sw.Write(H); sw.Flush(); } Console.WriteLine(H); FILE.Close(); } 

In fact, everything is simple! The Key variable can take any values ​​you wish. For example, I made a generator that produced a random combination and wrote it to a file. RMCrypto.Mode = CipherMode.ECB implements the type of encryption. The most interesting thing about this code is the write parameter of the Encoding.Unicode type. Here we change the encoding for encryption.
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Well, the function that implements the decryption of the DERCYPTO file:

 static void DECRYPTO(string f) { FileStream FILE = File.Open(f, FileMode.Open); string S = FILE.ToString(); string plaintext = null; byte[] Key = Encoding.Default.GetBytes("key12345678"); Array.Resize(ref Key, 16); RijndaelManaged RMCrypto = new RijndaelManaged(); RMCrypto.Mode = CipherMode.ECB; RMCrypto.Padding = PaddingMode.Zeros; RMCrypto.KeySize = 128; RMCrypto.Key = Key; ICryptoTransform Decryptor = RMCrypto.CreateDecryptor(); CryptoStream Crypt = new CryptoStream(FILE, Decryptor, CryptoStreamMode.Read); using (StreamReader sw = new StreamReader(Crypt, Encoding.Unicode)) { plaintext = sw.ReadToEnd(); } File.WriteAllText(f, plaintext.ToString()); Console.WriteLine(plaintext); FILE.Close(); } 

Do not forget to close the files after the execution of operations, otherwise errors will occur as the threads will not be closed.