94 lines
3.3 KiB
C#
94 lines
3.3 KiB
C#
using System;
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using System.IO;
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using System.Security.Cryptography;
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using System.Text;
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namespace Encrypt
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{
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/// <summary>
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/// See also:
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/// https://www.fluxbytes.com/csharp/encrypt-and-decrypt-files-in-c/
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/// </summary>
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class Program
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{
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static byte[] key = new byte[] { 83, 254, 105, 64, 184, 201, 195, 127, 52, 99, 77, 45, 252, 132, 163, 156 };
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static byte[] IV = new byte[] { 189, 23, 137, 56, 204, 241, 242, 118, 28, 89, 9, 198, 224, 111, 186, 125 };
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static void Main(string[] args)
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{
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if ((args.Length < 1) || !File.Exists(args[0]))
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{
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Console.WriteLine("Usage: Encode <file>");
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Console.ReadKey();
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return;
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}
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string fileName = args[0];
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string intermediateFile = fileName + ".encrypted"; /// Intermediate file, output of cryptography encoding
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string backupFile = fileName + ".bak";
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try
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{
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using (StreamReader reader = new StreamReader(fileName))
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{
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if (!reader.ReadLine().StartsWith("<?xml version="))
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{
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Console.WriteLine(string.Format("File {0} is already encrypted.", fileName));
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Console.ReadKey();
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return;
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}
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}
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bool successful = false;
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using (RijndaelManaged aes = new RijndaelManaged { Padding = PaddingMode.Zeros })
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{
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using (FileStream fsCrypt = new FileStream(intermediateFile, FileMode.Create))
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{
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using (ICryptoTransform encryptor = aes.CreateEncryptor(key, IV))
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{
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using (CryptoStream cs = new CryptoStream(fsCrypt, encryptor, CryptoStreamMode.Write))
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{
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using (FileStream fsIn = new FileStream(fileName, FileMode.Open))
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{
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int data;
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while ((data = fsIn.ReadByte()) != -1) cs.WriteByte((byte)data);
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successful = true;
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}
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}
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}
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}
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}
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if (successful)
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{
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/// File encryption successfuly completed => rotate files
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if (File.Exists(backupFile)) File.Delete(backupFile);
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File.Move(fileName, backupFile);
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File.Move(intermediateFile, fileName);
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return;
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}
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else
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{
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Failed(fileName, intermediateFile);
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return;
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}
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}
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catch (Exception)
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{
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Failed(fileName, intermediateFile);
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return;
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}
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}
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static void Failed(string fileName, string toBeDeleted)
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{
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if (File.Exists(toBeDeleted))
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{
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File.Delete(toBeDeleted);
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}
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Console.WriteLine(string.Format("Encryption of file {0} failed.", fileName));
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Console.ReadKey();
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}
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}
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}
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