[PYTHON-CRYPTO] Missing get0_signers in 0.17 and "header too long:asn1_lib.c" with 0.13 or 0.17 with p7m file

[Marco Bizzarri]

I'm sorry to post again on this topic. Reading from the changelog in
0.17 I understand get0_signer has been removed since its implementation
was wrong. Is there any plan to re-add it soon? Otherwise, could someone
provide hints on how it should be reimplemented in order to obtain a
proper behaviour and not crashing python anymore?

Regards
Marco

Marco Bizzarri wrote:
> Hi all. I've two different problems with two files which should be
> signed and readable.
>
> The first one is that it looks like the get0_signers method is missing
> from the 0.17 of M2Crypto. Is there any problem in this method?
> Otherwise, I can try to add it by myself copying from the code of
> 0.13.
>
> The second one is with a p7m file. I try to do the following on it:
>
>    def _load_pkcs7_bio_der(self, p7_bio):
>        p7_ptr = m2.pkcs7_read_bio_der(p7_bio._ptr())
>        if p7_ptr is None:
>            raise Err.get_error()
>        return SMIME.PKCS7(p7_ptr, 1)
>
>    def run(self, file):
>        import pdb; pdb.set_trace()
>        p7_bio = BIO.MemoryBuffer(file.read())
>        try:
>            p7 = self._load_pkcs7_bio_der(p7_bio)
>        except:
>            return []
>
> in the except branch I always get an exception with this file, with
> the following exception:
>
> 6720:error:0D07207B:asn1 encoding routines:ASN1_get_object:header too
> long:asn1_lib.c:150:
>
> If posting the file to the list is appropriate, I can do it.
>
> Regards
> Marco
>