sshkey_to_base64
if ((r = sshkey_to_base64(cert->signature_key, &catext)) != 0) {
if ((r = sshkey_to_base64(key, &keytext)) != 0) {
if ((r = sshkey_to_base64(key, &keytext)) != 0) {
if ((r = sshkey_to_base64(host_key, &keytext)) != 0)
if ((r = sshkey_to_base64(key, &uu)) != 0)
int sshkey_to_base64(const struct sshkey *, char **);