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

Org.BouncyCastle.Crypto.Parameters.KdfParameters

Parameters for the key derivation functions that derive keying material from a shared secret and an optional block of additional input: KDF1 and KDF2 of IEEE P1363a / ISO 18033-2 (KDF2 being the ANSI X9.63 KDF, where the additional input is the SharedInfo), and the NIST SP 800 - 56A concatenation KDF(where it is the OtherInfo).
namespace Org.BouncyCastle.Crypto.Parameters { public class KdfParameters : IDerivationParameters { public KdfParameters(byte[] shared, byte[] iv); public byte[] GetIV(); public byte[] GetSharedSecret(); } }