kex_derive_keys
int kex_derive_keys(struct ssh *, u_char *, u_int, const struct sshbuf *);
if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) != 0 ||
if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) != 0 ||
if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) != 0 ||
if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) != 0 ||