public void EncryptToStream(IFile file, Stream outputStream)
{
if (file == null)
{
throw new ArgumentNullException(nameof(file));
}
if (outputStream == null)
{
throw new ArgumentNullException(nameof(outputStream));
}
byte[] key = _key.GenerateBlock(_encryptionProvider.BlockSize);
byte[] iv = _iv.GenerateIV(_encryptionProvider.BlockSize);
ICryptoTransform encryptor = _encryptionProvider.CreateEncryptor(key, iv);
//Write IV in plain text to beginning of stream
outputStream.Seek(0, SeekOrigin.Begin);
outputStream.Write(iv, 0, iv.Length);
//Write encrypted data
using (Stream stream = file.Read())
{
var cryptoStream = new CryptoStream(outputStream, encryptor, CryptoStreamMode.Write);
stream.CopyTo(cryptoStream);
cryptoStream.FlushFinalBlock();
}
}