<PackageReference Include="BouncyCastle.Cryptography" Version="2.5.1" />

Org.BouncyCastle.Asn1.X509.Extension

public class Extension : Asn1Encodable
namespace Org.BouncyCastle.Asn1.X509 { public class Extension : Asn1Encodable { public DerBoolean Critical { get; } public DerObjectIdentifier ExtnID { get; } public Asn1OctetString ExtnValue { get; } public static Extension GetInstance(object obj); public static Extension GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit); public static Extension GetTagged(Asn1TaggedObject taggedObject, bool declaredExplicit); public Extension(DerObjectIdentifier extnID, DerBoolean critical, Asn1OctetString extnValue); public X509Extension GetX509Extension(); } }