<PackageReference Include="BouncyCastle.Cryptography" Version="2.3.1" />

Org.BouncyCastle.Crypto.IEncapsulatedSecretExtractor

public interface IEncapsulatedSecretExtractor
namespace Org.BouncyCastle.Crypto { public interface IEncapsulatedSecretExtractor { int EncapsulationLength { get; } byte[] ExtractSecret(byte[] encapsulation); } }