<PackageReference Include="BouncyCastle.Cryptography" Version="2.8.0-beta.349" />

Org.BouncyCastle.Bcpg.PacketFormat

public enum PacketFormat
OpenPGP Packet Header Length Format.
namespace Org.BouncyCastle.Bcpg { public enum PacketFormat { Legacy, Current, Roundtrip } }