sshpkt_getb_froms
if ((r = sshpkt_getb_froms(ssh, &b)) != 0 ||
if ((r = sshpkt_getb_froms(ssh, &server_host_key_blob)) != 0)
if ((r = sshpkt_getb_froms(ssh, &server_blob)) != 0 ||
if ((r = sshpkt_getb_froms(ssh, &client_pubkey)) != 0 ||
if ((r = sshpkt_getb_froms(ssh, &server_host_key_blob)) != 0)
int sshpkt_getb_froms(struct ssh *ssh, struct sshbuf **valp);