<PackageReference Include="BouncyCastle.Cryptography" Version="2.5.0" />

Org.BouncyCastle.Crypto.Parameters.RC5Parameters

public class RC5Parameters : KeyParameter
namespace Org.BouncyCastle.Crypto.Parameters { public class RC5Parameters : KeyParameter { public int Rounds { get; } public RC5Parameters(byte[] key, int rounds); } }