<PackageReference Include="Azure.Storage.Blobs" Version="12.25.1" />

Azure.Storage.Blobs.BlobClientSideDecryptor

public Task<Stream> DecryptInternal(Stream content, IDictionary<string, string> metadata, HttpRange originalRange, string receivedContentRange, bool async, CancellationToken cancellationToken)

public Task<Stream> DecryptWholeBlobWriteInternal(Stream plaintextDestination, IDictionary<string, string> metadata, bool async, CancellationToken cancellationToken)