<PackageReference Include="NETStandard.Library" Version="2.0.1" />

System.Security.Cryptography.X509Certificates.X509KeyStorageFlags

public enum X509KeyStorageFlags
namespace System.Security.Cryptography.X509Certificates { public enum X509KeyStorageFlags { DefaultKeySet = 0, Exportable = 4, MachineKeySet = 2, PersistKeySet = 16, UserKeySet = 1, UserProtected = 8 } }