Re: [Pyme-help] help needed with verify and 0.5.0

[Carsten R. <car...@ga...>]

Hello Igor and Bernhard,

thank you for your help. In the meantime I tried another approach (the 
one Bernhard suggested) to try to enable the latest version of pyme on 
the target system (I was not desperate enough before to do so ;-) ).

I had to compile libgpg-errors, libgpgme, swig and after some changes in 
Make- and header-files (python was at a very unusual place on that 
system) installing pyme worked and I can use the software I have written 
for that version of pyme.

So thanks again for all your help.

With best regards

Carsten Reimer

> Igor Belyi wrote:
>> Carsten Reimer wrote:
>>> sory for asking for help for this _very outdated_ version of pyme, 
>>> but the system that has to be used does not allow any other version 
>>> because of the underlying gpgme-lib.
>>>
>>> I managed to en- and decrypt messages and sign as well but verifying 
>>> does not work for me.
>>>
>>> The problem is in the third parameter of op_verify which in the 
>>> original gpgme-func is of type GpgmeSigStat and will take the 
>>> summarized result of the verification (with 0.8.0 you can do that 
>>> with op_verify_result() and then check the signatures yourself).
>>> As far as I can see there is no equivalent to this GpgmeSigStat-type 
>>> in pyme so I tried to set it to None or use an integer var but the 
>>> latter resulted in a type error requesting a _p_GpgmeSigStat type for 
>>> that variable while the first resulted in an error messoge 'Invalid 
>>> value (3)'.
>>>
>>> I tried as well using only op_verify_start and asking 
>>> get_sig_ulong_attr(0, attr.SIG_SUMMARY, 0) afterwards but that does 
>>> not lead to anything else but zero as return value.
>>>
>>> So is 0.5.0 not able to verify signatures or am I too blind to see 
>>> how that works?
>>>   
>> I don't remember details of the libgpgme6 API. Could you send gpgme.h 
>> from the version of the gpgme-lib on your
>> system? At least, declaration of the op_verify method and of the 
>> structures used there as parameters.
> OK, the oldest gpgme-lib I could find is 0.3.13 although the pyme-0.5.0 
> from the John Goerzen's site was built against
> 0.3.12 but I don't think the difference should be important for your 
> problem.
> 
> As for the op_verify problem I think you are out of luck unless you can 
> recompile pyme on that system.
> 
> Passing by reference in Python wrapper requires helper functions. If you 
> look at the gpgme.i file their generation
> is requested with %pointer_functions() directive for each type passed by 
> reference in some gpgme function. You'll
> need to add the following directive in there:
> %pointer_functions(GpgmeSigStat, GpgmeSigStat_p);
> 
> After that you should add the following method to the Context class in 
> pyme/core.py:
>    def op_verify(self, sig, text):
>       ptr = gpgme.new_GpgmeSigStat_p()
>       errorcheck(gpgme.gpgme_op_verify(self.wrapped, sig, text, ptr))
>       status = gpgme.GpgmeSigStat_p_value(ptr)
>       gpgme.delete_GpgmeSigStat_p(ptr)
>       return status
> 
> With these changes after recompile op_verify will require only 2 
> parameters and will return status value.
> 
> Hope it's helpful.
> Cheers,
> Igor
> 


-- 
Carsten Reimer
Web Developer
car...@ga...
Phone +49.228.42150.73

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