[PYTHON-CRYPTO] M2Crypto SMIME Mail verification error in Outlook and Thunderbird

[Heikki Toivonen]

Patrick Hagelkruys wrote:
> I tried to digital sign a message with m2crypto and verify it with Outlook.
> But Outlook (also Thunderbird) failed to verify the signature, because the
> digital signature of the message is invalid. 

I looked at what the OpenSSL smime tool does, and noticed it sets the
detached flag as well, which you didn't do in your sample below. When I
add that, I get output that looks compatible with the openssl tool.

In other words, change this:

>     p7 = s.sign(buf,SMIME.PKCS7_TEXT)

To this:

p7 = s.sign(buf,SMIME.PKCS7_TEXT|SMIME.PKCS7_DETACHED)

-- 
  Heikki Toivonen


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