private static byte[] LoadFileAndDecrypt(string filePath)
{
try
{
if (File.Exists(filePath))
{
var cipherBytes = File.ReadAllBytes(filePath);
return(DecryptBytes(cipherBytes));
}
}
catch (Exception ex)
{
UiMessages.Error($"Decryption error:\n\n{ex}");
}
//default
return(null);
}
public static byte[] DecryptBytes(byte[] cipherBytes, bool dumpTarGz = true)
{
try
{
var decryptedBytes = CryptoHandler.Decrypt(cipherBytes, Password);
if (dumpTarGz)
{
File.WriteAllBytes(@"config.tar.gz", decryptedBytes);
}
return(decryptedBytes);
}
catch (Exception ex)
{
UiMessages.Error($"Decryption error:\n\n{ex}");
}
//default
return(null);
}
private static bool IsEncrypted(this byte[] data)
{
try
{
//OpenSSL-encrypted files usually include this text prefix before the encrypted buffer
const string prefix = @"Salted__";
var prefixLength = prefix.Length;
var relevantBytes = new byte[prefixLength];
Buffer.BlockCopy(data, 0, relevantBytes, 0, prefixLength);
var prefixData = Encoding.Default.GetString(relevantBytes);
return(prefixData == prefix);
}
catch (Exception ex)
{
UiMessages.Error($"Determination error:\n\n{ex}");
}
//default
return(false);
}
private static byte[] DecompressGzBytes(byte[] gzBytes)
{
try
{
byte[] decompressedBytes;
using (var rawStream = new MemoryStream(gzBytes))
{
using (var decompressionStream = new GZipStream(rawStream, CompressionMode.Decompress))
{
var ms = new MemoryStream();
decompressionStream.CopyTo(ms);
decompressedBytes = ms.ToArray();
}
}
return(decompressedBytes);
}
catch (Exception ex)
{
UiMessages.Error($"Decompression failed!\n\n{ex}");
return(null);
}
}