diff --git a/sshkeys/func.go b/sshkeys/func.go
index 3102e8b..8630dc2 100644
--- a/sshkeys/func.go
+++ b/sshkeys/func.go
@@ -2,15 +2,18 @@ package sshkeys
 
 import (
 	"errors"
+
+	"r00t2.io/goutils/checks"
 )
 
-func genPrivKey(cipherAlgo string, kdf string, salt []byte, rounds uint32) ([]byte, error) {
-
+func genPrivKey(cipherAlgo string, kdf string, salt []byte, rounds uint32, passphrase string) ([]byte, error) {
 	return nil, nil
 }
 
 func genPubKey(privKey *[]byte) ([]byte, error) {
-
+	if *privKey == nil {
+		return nil, errors.New("must generate private key before public key")
+	}
 	return nil, nil
 }