diff --git a/scripts/imgtool/keys/general.py b/scripts/imgtool/keys/general.py
new file mode 100644
index 0000000..3ba34cb
--- /dev/null
+++ b/scripts/imgtool/keys/general.py
@@ -0,0 +1,35 @@
+"""General key class."""
+
+import sys
+
+AUTOGEN_MESSAGE = "/* Autogenerated by imgtool.py, do not edit. */"
+
+class KeyClass(object):
+    def _public_emit(self, header, trailer, indent, file=sys.stdout, len_format=None):
+        print(AUTOGEN_MESSAGE, file=file)
+        print(header, end='', file=file)
+        encoded = self.get_public_bytes()
+        for count, b in enumerate(encoded):
+            if count % 8 == 0:
+                print("\n" + indent, end='', file=file)
+            else:
+                print(" ", end='', file=file)
+            print("0x{:02x},".format(b), end='', file=file)
+        print("\n" + trailer, file=file)
+        if len_format is not None:
+            print(len_format.format(len(encoded)), file=file)
+
+    def emit_c(self, file=sys.stdout):
+        self._public_emit(
+                header="const unsigned char {}_pub_key[] = {{".format(self.shortname()),
+                trailer="};",
+                indent="    ",
+                len_format="const unsigned int {}_pub_key_len = {{}};".format(self.shortname()),
+                file=file)
+
+    def emit_rust(self, file=sys.stdout):
+        self._public_emit(
+                header="static {}_PUB_KEY: &'static [u8] = &[".format(self.shortname().upper()),
+                trailer="];",
+                indent="    ",
+                file=file)