108 lines
4.0 KiB
C#
108 lines
4.0 KiB
C#
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using System;
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using System.IO;
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using System.Security.Cryptography;
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namespace Decode
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{
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class Program
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{
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static byte[] cryptoKey = new byte[] { 235, 7, 236, 58, 24, 225, 97, 102, 231, 1, 121, 12, 177, 145, 87, 200,
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102, 85, 152, 73, 230, 203, 101, 169, 242, 213, 228, 219, 239, 157, 245, 156 };
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static byte[] cryptoIV = 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: Decode <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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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} was not 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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Stream stream = File.OpenRead(fileName);
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using (BinaryReader binaryReader = new BinaryReader(stream))
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{
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int length = (int)(new FileInfo(fileName).Length);
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/// Load encrypted binary data into an array
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byte[] encrypted = new byte[length];
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int bytesRead = binaryReader.Read(encrypted, 0, length);
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if (bytesRead != length)
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{
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Console.WriteLine(string.Format("Failed to read file {0}.", fileName));
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Console.ReadKey();
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return;
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}
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using (RijndaelManaged myRijndael = new RijndaelManaged())
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{
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/// Create a decryptor to perform the stream transform.
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ICryptoTransform decryptor = myRijndael.CreateDecryptor(cryptoKey, cryptoIV);
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/// Create the streams used for decryption.
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using (MemoryStream msDecrypt = new MemoryStream(encrypted))
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{
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using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
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{
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using (StreamReader srDecrypt = new StreamReader(csDecrypt))
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{
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using (TextWriter writer = new StreamWriter(fileName + ".plain"))
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{
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writer.Write(srDecrypt.ReadToEnd());
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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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}
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if (successful)
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{
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/// Decoding the file was successfuly completed => rotate files
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if (File.Exists(fileName + ".bak")) File.Delete(fileName + ".bak");
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File.Move(fileName, fileName + ".bak");
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File.Move(fileName + ".plain", 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);
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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);
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return;
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}
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}
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static void Failed(string fileName)
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{
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if (File.Exists(fileName + ".plain"))
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{
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File.Delete(fileName + ".plain");
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}
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Console.WriteLine(string.Format("Decoding 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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