public static Some<Tuple<string, long>> EncryptFile(string dstDir, EncryptOperation oper, byte[] key)
{
if (!File.Exists(oper.FileName)) return ErrorValues[ErrorType.FileNoExist];
var outputFileName = Path.Combine(dstDir, oper.EncFileName);
var outputDir = Path.GetDirectoryName(outputFileName);
if (string.IsNullOrWhiteSpace(outputDir)) return ErrorValues[ErrorType.OutDirMissing];
Directory.CreateDirectory(outputDir);
using (var aes = new AuthenticatedAesCng())
{
aes.CngMode = CngChainingMode.Gcm;
aes.Key = key;
aes.GenerateIV();
byte[] tag;
using (var outputFile = File.OpenWrite(outputFileName))
{
outputFile.Write(OuterMagicHeader.ToArray());
outputFile.Write(BitConverter.GetBytes(aes.Tag.Length));
outputFile.Write(BitConverter.GetBytes(aes.IV.Length));
outputFile.Write(aes.Tag);
outputFile.Write(aes.IV);
using (var enc = aes.CreateEncryptor())
{
using (var cryptoStream = new CryptoStream(outputFile, enc, CryptoStreamMode.Write))
{
cryptoStream.Write(MagicHeader.ToArray());
var fileName = Encoding.UTF8.GetBytes(oper.RelFileName);
var fileNameSize = BitConverter.GetBytes(Convert.ToInt32(fileName.Length));
cryptoStream.Write(fileNameSize);
cryptoStream.Write(fileName);
using (var inputFile = File.OpenRead(oper.FileName))
{
inputFile.CopyTo(cryptoStream);
}
}
tag = ((IAuthenticatedCryptoTransform)enc).GetTag();
}
}
using (var outputFile = File.OpenWrite(outputFileName))
{
outputFile.Seek(TagStartPos, SeekOrigin.Begin);
outputFile.Write(tag, 0, tag.Length);
}
return new Some<Tuple<string, long>>(Tuple.Create(outputFileName, new FileInfo(oper.FileName).Length));
}
}
public long PerformEncryption(CommonOptions options, IOutputHandler outputHandler, EncryptOperation o, byte[] key)
{
outputHandler.WriteVerbose("\t{0} => ", o.RelFileName);
var result = FileEncrypter.EncryptFile(options.DestinationDir, o, key);
if (result.HasResult)
{
outputHandler.WriteVerboseLine(o.EncFileName);
return(result.Result.Item2);
}
outputHandler.WriteVerboseOrNormalLine("\t{0} => Failed to encrypt file! ({1})", "Failed to encrypt file! ({1})", o.RelFileName, result.ErrorMessage);
return(0);
}
public static Some <Tuple <string, long> > EncryptFile(string dstDir, EncryptOperation oper, byte[] key)
{
if (!File.Exists(oper.FileName))
{
return(ErrorValues[ErrorType.FileNoExist]);
}
var outputFileName = Path.Combine(dstDir, oper.EncFileName);
var outputDir = Path.GetDirectoryName(outputFileName);
if (string.IsNullOrWhiteSpace(outputDir))
{
return(ErrorValues[ErrorType.OutDirMissing]);
}
Directory.CreateDirectory(outputDir);
using (var aes = new AuthenticatedAesCng())
{
aes.CngMode = CngChainingMode.Gcm;
aes.Key = key;
aes.GenerateIV();
byte[] tag;
using (var outputFile = File.OpenWrite(outputFileName))
{
outputFile.Write(OuterMagicHeader.ToArray());
outputFile.Write(BitConverter.GetBytes(aes.Tag.Length));
outputFile.Write(BitConverter.GetBytes(aes.IV.Length));
outputFile.Write(aes.Tag);
outputFile.Write(aes.IV);
using (var enc = aes.CreateEncryptor())
{
using (var cryptoStream = new CryptoStream(outputFile, enc, CryptoStreamMode.Write))
{
cryptoStream.Write(MagicHeader.ToArray());
var fileName = Encoding.UTF8.GetBytes(oper.RelFileName);
var fileNameSize = BitConverter.GetBytes(Convert.ToInt32(fileName.Length));
cryptoStream.Write(fileNameSize);
cryptoStream.Write(fileName);
using (var inputFile = File.OpenRead(oper.FileName))
{
inputFile.CopyTo(cryptoStream);
}
}
tag = ((IAuthenticatedCryptoTransform)enc).GetTag();
}
}
using (var outputFile = File.OpenWrite(outputFileName))
{
outputFile.Seek(TagStartPos, SeekOrigin.Begin);
outputFile.Write(tag, 0, tag.Length);
}
return(new Some <Tuple <string, long> >(Tuple.Create(outputFileName, new FileInfo(oper.FileName).Length)));
}
}
