protected virtual string EncryptName(string name)
{
var bytes = Encoding.UTF8.GetBytes(name);
var aesVersion = FileSystem.Version;
using (var aes = CreateAes(aesVersion))
{
var iv = aes.IV;
var key = FileSystem.ComputeKey(iv, aesVersion);
using (var tranform = aes.CreateEncryptor(key, iv))
{
using (var outputStream = new MemoryStream())
{
var aesHeader = new AesHeader(aesVersion, iv);
aesHeader.Write(outputStream);
var encryptedBytes = tranform.TransformFinalBlock(bytes, 0, bytes.Length);
outputStream.Write(encryptedBytes, 0, encryptedBytes.Length);
return(Convert.ToBase64String(outputStream.ToArray()).Replace('/', '-'));
}
}
}
}
public async Task <IFileInfo> CreateFileAsync(string name, Stream stream, long length, CancellationToken ct)
{
if (FileSystem.EncryptFileName)
{
name = EncryptName(name);
}
using (var aes = CreateAes(FileSystem.Version))
{
using (var headerStream = new MemoryStream())
{
var aesHeader = new AesHeader(FileSystem.Version, aes.IV);
aesHeader.Write(headerStream);
headerStream.Seek(0, SeekOrigin.Begin);
var key = FileSystem.ComputeKey(aes.IV, FileSystem.Version);
ICryptoTransform encryptor = CreateTransform(aes, key, aes.IV, AesMode.Encrypt);
using (var cryptoStream = new CryptoStream(stream, encryptor, CryptoStreamMode.Read))
using (var concat = new StreamEnumerator(new Stream[] { headerStream, cryptoStream }, true))
{
var fileInfo = await _directoryInfo.CreateFileAsync(name, concat, length, ct).ConfigureAwait(false);
return(new AesFileInfo(FileSystem, fileInfo));
}
}
}
}
