Org.BouncyCastle.Crypto.Generators.X25519KeyPairGenerator
Key-pair generator for X25519 (RFC 7748). Only the SecureRandom from the supplied
KeyGenerationParameters is used; the 32-byte clamped scalar is drawn directly from it.
public X25519KeyPairGenerator()
Generate a fresh X25519 key pair.
Capture the SecureRandom that will source the scalar.