Using a PEM keyfile instead of a DER for the signing key

apps/generate_key.py

@@ -1,6 +1,16 @@
 import ecdsa
+import os.path
+from sys import exit
 
+# Simple tool to generate an ECDSA private key using the secp256k1 curve and save it to signing_key.pem
+
+FILE_NAME = 'signing_key.pem'
 
 if __name__ == '__main__':
+    if os.path.exists(FILE_NAME):
+        print("A key with name \"{}\" already exists. Aborting.".format(FILE_NAME))
+        exit(1)
+
     sk = ecdsa.SigningKey.generate(curve=ecdsa.SECP256k1)
-    print(sk.to_der())
+    open(FILE_NAME, 'wb').write(sk.to_pem())
+    print("Saved key \"{}\".".format(FILE_NAME))