Be explicit that this is for signing user keys

server/main.go

@@ -99,7 +99,7 @@ func signHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, er
 	if err != nil {
 		return http.StatusInternalServerError, err
 	}
-	signed, err := a.sshKeySigner.Sign(req)
+	signed, err := a.sshKeySigner.SignUserKey(req)
 	a.authprovider.Revoke(token)
 	if err != nil {
 		return http.StatusInternalServerError, err

server/signer/signer.go

@@ -18,7 +18,7 @@ type KeySigner struct {
 	permissions map[string]string
 }
 
-func (s *KeySigner) Sign(req *lib.SignRequest) (string, error) {
+func (s *KeySigner) SignUserKey(req *lib.SignRequest) (string, error) {
 	pubkey, _, _, _, err := ssh.ParseAuthorizedKey([]byte(req.Key))
 	if err != nil {
 		return "", err