ssh_agent_sign
int ssh_agent_sign(int sock, const struct sshkey *key,
if ((r = ssh_agent_sign(auth_sock, key, &signature, &siglen,
if ((r = ssh_agent_sign(agent_fd, key, &sig, &slen, data, sizeof(data),
return ssh_agent_sign(*agent_fdp, key, sigp, lenp,
return ssh_agent_sign(id->agent_fd, id->key, sigp, lenp,