https://www.nuget.org/packages/System.Security.Cryptography.Pkcs/8.0.0-preview.7.23375.6
NuGet Gallery | System.Security.Cryptography.Pkcs 8.0.0-preview.7.23375.6
Provides support for PKCS and CMS algorithms. Commonly Used Types: System.Security.Cryptography.Pkcs.EnvelopedCms
gallery systempkcs 8