crypto_kem_sntrup761_keypair
int crypto_kem_sntrup761_keypair(unsigned char *pk, unsigned char *sk);
crypto_kem_sntrup761_keypair(kemsx->public, kemsx->secret);
int crypto_kem_sntrup761_keypair(unsigned char *pk, unsigned char *sk);
crypto_kem_sntrup761_keypair(cp, kex->sntrup761_client_key);