public async Task Encrypt(Stream input, Stream output)
{
_aes.GenerateIV();
if (_cancelEvent.IsSet())
{
return;
}
byte[] vector = _aes.IV;
byte[] vectorLength = BitConverter.GetBytes(vector.Length);
output.Write(vectorLength, 0, 4);
output.Write(vector, 0, vector.Length);
if (_cancelEvent.IsSet())
{
return;
}
using (ICryptoTransform encryptor = _aes.CreateEncryptor())
using (CryptoStream encryptionStream = new CryptoStream(output, encryptor, CryptoStreamMode.Write))
{
if (_cancelEvent.IsSet())
{
return;
}
await PatcherService.CopyAsync(input, encryptionStream, _cancelEvent, Progress);
encryptionStream.FlushFinalBlock();
}
}
private async Task Download(String url, Stream output)
{
if (_cancelEvent.WaitOne(0))
{
return;
}
using (HttpClient client = new HttpClient())
using (Stream input = await client.GetStreamAsync(url))
await PatcherService.CopyAsync(input, output, _cancelEvent, DownloadProgress);
}
public async Task Decrypt(Stream input, Stream output)
{
_aes.IV = input.EnsureRead(BitConverter.ToInt32(input.EnsureRead(4), 0));
Progress.NullSafeInvoke(4);
using (ICryptoTransform decryptor = _aes.CreateDecryptor())
using (CryptoStream encryptionStream = new CryptoStream(input, decryptor, CryptoStreamMode.Read))
{
if (_cancelEvent.IsSet())
{
return;
}
await PatcherService.CopyAsync(encryptionStream, output, _cancelEvent, Progress);
}
}
