public static Stream JustDecryptAndDecompress(FileInfo file, string password, string salt)
{
MemoryStream decompressedStream = new MemoryStream();
using (FileStream source = new FileStream(file.FullName, FileMode.Open, FileAccess.Read, FileShare.Read))
using (StreamCryptoWrapper decryptedSource = StreamCryptoWrapper.Decrypt(source, password, salt))
using (MemoryStream decryptedMemory = new MemoryStream())
{
decryptedSource.CryptoStream.CopyTo(decryptedMemory);
decryptedMemory.Position = 0;
KeepLzmaCompressor.Decompress(decryptedMemory, decompressedStream);
decompressedStream.Position = 0;
}
return(decompressedStream);
}
public override void Execute()
{
EnsurePathExists(PendingPath);
try
{
if (_Mode == ModeEnum.CompressEncrypt)
{
Program.log.Debug("starting backup of " + FromPath);
Program.log.Debug("=> compress and encrypt to " + PendingPath);
using (Stream encryptedStream = GetEncryptedStream())
using (StreamCryptoWrapper encryptedTarget = StreamCryptoWrapper.Encrypt(encryptedStream, _Password, _Salt))
{
using (Stream compressedStream = GetCompressedStream())
{
using (FileStream source = new FileStream(FromPath, FileMode.Open, FileAccess.Read, FileShare.Read))
KeepLzmaCompressor.Compress(source, compressedStream);
compressedStream.Position = 0;
Program.log.Debug("compression done, start encrypting");
compressedStream.CopyTo(encryptedTarget.CryptoStream);
encryptedTarget.CryptoStream.FlushFinalBlock();
Program.log.Debug("encryption done, hashing result");
}
encryptedStream.Position = 0;
ChecksumTarget = KeepHasher.GetHash(encryptedStream);
encryptedStream.Position = 0;
SizeTarget = encryptedStream.Length;
Program.log.Debug("done");
if (encryptedStream is MemoryStream)
{
using (Stream target = new FileStream(PendingPath, FileMode.Create, FileAccess.Write, FileShare.Read))
encryptedStream.CopyTo(target);
}
}
}
else if (_Mode == ModeEnum.DecryptDecompress)
{
Program.log.Debug("<= decrypt and decompress " + FromPath);
using (FileStream source = new FileStream(FromPath, FileMode.Open, FileAccess.Read, FileShare.Read))
using (StreamCryptoWrapper decryptedSource = StreamCryptoWrapper.Decrypt(source, _Password, _Salt))
using (Stream decryptedMemory = GetDecryptedStream())
using (FileStream target = new FileStream(PendingPath, FileMode.Create, FileAccess.Write, FileShare.Read))
{
decryptedSource.CryptoStream.CopyTo(decryptedMemory);
decryptedMemory.Position = 0;
Program.log.Debug("decryption to memory done, decompressing to disc");
KeepLzmaCompressor.Decompress(decryptedMemory, target);
Program.log.Debug("decompression done");
}
}
}
finally
{
foreach (string file in _TempFilesToDelete)
{
Program.log.Debug("deleting temp file " + file);
File.Delete(file);
}
}
EnsurePathExists(ToPath);
Program.log.Debug("renaming " + PendingPath + " -> " + ToPath);
File.Move(PendingPath, ToPath);
if (_Mode == ModeEnum.DecryptDecompress)
{
Program.log.Debug("restoring metadata " + ToPath);
FileInfo fi = new FileInfo(ToPath);
fi.LastWriteTimeUtc = SourceFile.LastWriteTimeUtc;
fi.CreationTimeUtc = SourceFile.CreationTimeUtc;
if (fi.Length != SourceFile.SizeBytes)
{
Program.log.Error("size mismatch " + ToPath + " " + SourceFile.Sha256);
}
//string sha = Hashing.GetHash(fi);
//if (sha != SourceFile.Sha256)
// Program.log.Error("hash mismatch " + ToPath + " " + sha + " but should be "+ SourceFile.Sha256);
}
}
