<PackageReference Include="BouncyCastle.Cryptography" Version="2.8.0-beta.349" />

Org.BouncyCastle.Math.BinPoly.X86.V128.Backend

static class Backend
Entry point for the X86.V128 backend: an IsEnabled gate and a CreateBinPolyMul factory that picks the most specialised IBinPolyMul impl for the requested polynomial size. Decouples BinPolys's dispatch from the backend's own gate condition — the outer dispatch just asks "are you applicable?" and "give me an instance".
namespace Org.BouncyCastle.Math.BinPoly.X86.V128 { internal static class Backend { } }