Thanks Viktor for your feedback

Well, the 2 certificates are embedded in the python code as PEM; I am attaching 
them again here as plain files if that helps

Attachment: p1
Description: Binary data

Attachment: p2
Description: Binary data

In terms of versioning, on one box that exhibits the issue of returning -1, I 
have this:

# cat /etc/fedora-release
Fedora release 24 (Twenty Four)

both openssl and m2crypto installed from fedora’s stock repos:

# rpm -q m2crypto openssl-libs

# uname -a
Linux 4.8.15-300.fc25.x86_64 #1 SMP Thu Dec 15 
23:10:23 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

I hope it clarifies — thanks for looking into this — Thierry

> On 13 Jan 2017, at 15:26, Viktor Dukhovni <> wrote:
>> On Jan 13, 2017, at 5:28 AM, Thierry Parmentelat 
>> <> wrote:
>> I have two certificates, one being signed by the other
>> the attached code is a python code that uses M2Crypto to check for that fact
> Your current problem is failure to post the two certificates along with
> the anecdotal description.  You're also not reporting which versions of
> the various O/S distributions you were using, and more importantly which
> versions of OpenSSL were linked into Python's M2Crypto.
> Real answers require real data.
> -- 
> -- 
>       Viktor.
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