<PackageReference Include="BouncyCastle.Cryptography" Version="2.6.1" />

Bmi1

static class Bmi1
using System.Runtime.Intrinsics.X86; namespace Org.BouncyCastle.Runtime.Intrinsics.X86 { internal static class Bmi1 { internal static class X64 { internal static bool IsEnabled => System.Runtime.Intrinsics.X86.Bmi1.X64.IsSupported; } } }