net481 
namespace System.Security.Cryptography
{
    public enum HpkeKem
    {
        DHKEM_X25519_HKDF_SHA256 = 32
    }
}
Design Reviews
.NET Framework
4.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

Microsoft.Bcl.Cryptography , Version=11.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

Referencing

Your project needs a package reference to Microsoft.Bcl.Cryptography.

Package Microsoft.Bcl.Cryptography (11.0.0-rc.2.26504.105) net462
Preview SYSLIB5009: This API is marked as experimental.(more details)
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