Azure.Storage.Cryptography.AuthenticatedRegionCryptoStream class AuthenticatedRegionCryptoStream : Stream Documentation Code public AuthenticatedRegionCryptoStream(Stream innerStream, IAuthenticatedCryptographicTransform transform, int regionDataSize, CryptoStreamMode streamMode, ArrayPool<byte> arrayPool = null) public Task FlushFinalInternal(bool async, CancellationToken cancellationToken)