crypto_sign_ed25519_keypair
crypto_sign_ed25519_keypair(pk, sk);
int crypto_sign_ed25519_keypair(unsigned char *, unsigned char *);
crypto_sign_ed25519_keypair(pubkey.pubkey, enckey.seckey);
int crypto_sign_ed25519_keypair(unsigned char *, unsigned char *);
crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);