diff --git a/scripts/imgtool/keys/rsa.py b/scripts/imgtool/keys/rsa.py
index d8543ed..d51d36d 100644
--- a/scripts/imgtool/keys/rsa.py
+++ b/scripts/imgtool/keys/rsa.py
@@ -44,6 +44,11 @@
                 encoding=serialization.Encoding.DER,
                 format=serialization.PublicFormat.PKCS1)
 
+    def get_public_pem(self):
+        return self._get_public().public_bytes(
+                encoding=serialization.Encoding.PEM,
+                format=serialization.PublicFormat.SubjectPublicKeyInfo)
+
     def get_private_bytes(self, minimal):
         self._unsupported('get_private_bytes')