- Make RSA signatures in dkimpy-milter optional, so dkimpy-milter can be

added after an existing DKIM signing application to add an Ed25519
   signature (Thanks to A. Schulze for the patch)

CHANGES

@@ -7,6 +7,9 @@
    creation to README
  - Fixed a bug where dkim fail might be reported as pass when verifying
    multiple signatures and a previous signature had passed
+ - Make RSA signatures in dkimpy-milter optional, so dkimpy-milter can be
+   added after an existing DKIM signing application to add an Ed25519
+   signature (Thanks to A. Schulze for the patch)
 
 0.9.3 2018-03-02
  - Fixup csl dataset processing for single item lists

dkimpy_milter/__init__.py

@@ -195,11 +195,12 @@ class dkimMilter(Milter.Base):
           canonicalize.append(canon)
       syslog.syslog('canonicalize: {0}'.format(canonicalize))
       try:
-        d = dkim.DKIM(txt)
-        h = d.sign(milterconfig.get('Selector'), self.fdomain, privateRSA,
-                canonicalize=(canonicalize[0], canonicalize[1]))
-        name,val = h.split(': ',1)
-        self.addheader(name,val.strip().replace('\r\n','\n'),0)
+        if privateRSA:
+            d = dkim.DKIM(txt)
+            h = d.sign(milterconfig.get('Selector'), self.fdomain, privateRSA,
+                    canonicalize=(canonicalize[0], canonicalize[1]))
+            name,val = h.split(': ',1)
+            self.addheader(name,val.strip().replace('\r\n','\n'),0)
         if privateEd25519:
             d = dkim.DKIM(txt)
             h = d.sign(milterconfig.get('SelectorEd25519'), self.fdomain, privateEd25519,