<PackageReference Include="BouncyCastle.Cryptography" Version="2.4.0" />

RecordFormat

public abstract class RecordFormat
namespace Org.BouncyCastle.Tls { public abstract class RecordFormat { public const int TypeOffset = 0; public const int VersionOffset = 1; public const int LengthOffset = 3; public const int FragmentOffset = 5; } }