Fixup MIMEWrapper decryption.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/mailman_pgp/pgp/mime.py b/src/mailman_pgp/pgp/mime.py
index 92ee72b..c36cc37 100644
--- a/src/mailman_pgp/pgp/mime.py
+++ b/src/mailman_pgp/pgp/mime.py
@@ -171,6 +171,8 @@ class MIMEWrapper:
         :rtype: mailman.email.message.Message
         """
         payload = self.msg.as_string()
+        # Wrap payload in PGPMessage with cleartext=True to get a signature
+        # of a canonical document.
         pmsg = PGPMessage.new(payload, cleartext=True)
         signature = key.sign(pmsg, hash=hash)
 
@@ -203,7 +205,8 @@ class MIMEWrapper:
         :rtype: mailman.email.message.Message
         """
         msg_text = self.msg.get_payload(1).get_payload()
-        pmsg = PGPMessage.from_blob(msg_text)
+        pmsg = PGPMessage()
+        pmsg.parse(msg_text)
         decrypted = key.decrypt(pmsg)
         out = message_from_string(decrypted.message, _class=Message)
         copy_headers(self.msg, out)