diff --git a/functions b/functions
index 5f1f932..2c113fe 100644
--- a/functions
+++ b/functions
@@ -21,11 +21,10 @@ sign_file () {
   local _file="$1"
 
   test ! -f "$_file" && return 1
-
-  if ! openssl dgst -sha512 -sign "$private_key" "$_file" | base64 | tr -d "\n" > "$_file.sign" ; then
-    rm -f "$_file.sign"
-    return 1
+  if test -f "$_file.sig" ; then
+    echo "$_file.sig"
+    return 0
   fi
 
-  echo "$_file.sign"
+  LC_ALL=C ssh-keygen -Y sign -f ~/.ssh/id_ed25519 -n file "$_file" 2>&1| grep Write | cut -d " " -f 4
 }