[openssl-users] Help finding replacement for ASN1_seq_unpack_X509

Thu Jul 21 19:08:24 UTC 2016

I was just typing a reply to your previous message asking for a bit of
clarification and this message just came through -- answered every single
one of my questions !

To answer your question about the swig changes, I was able to solve the
problem by moving your code to the top of the swig declarations file. The
M2Crypto swig declaration file uses some pretty sophisticated directives,
and I think one of them was getting in the way.  Specifically, I believe it
was a conflict with %inline %{ ... %} and the swig pre-processor.

We're using SWIG 3.0.1, and we're compiling a small list of bug fixes for
them as well (mostly with how they handle certain Microsoft specific
extensions).  After we finish the port of M2Crypto, we'll submit to them as
well.

> -----Original Message-----
> From: openssl-users [mailto:openssl-users-bounces at openssl.org] On
> Behalf Of Dr. Stephen Henson
> Sent: Thursday, July 21, 2016 3:00 PM
> To: openssl-users at openssl.org
> Subject: Re: [openssl-users] Help finding replacement for
> ASN1_seq_unpack_X509
> 
> On Thu, Jul 21, 2016, Jim Carroll wrote:
> 
> > Steve,
> >
> > I ran into problems with swig when I tried to deploy you suggestion.
> Your
> > solution was slick pre-processor magic's and I was having difficulty
> > reversing the magic to troubleshoot swig (and I was a little shy
> about
> > admitting I didn't understand your suggestion).
> >
> 
> Well there are various things going on underneath which can be hard to
> follow
> if you aren't used to them. Here's a bit more detail about what is
> going on.
> 
> Initially we just include the necessary headers:
> 
> #include <openssl/x509.h>
> #include <openssl/asn1t.h>
> 
> ASN.1 encode/decode routines generally use a structure name. We have
> STACK_OF(X509) but no name for that so we can make one up which I call
> SEQ_CERT:
> 
> typedef STACK_OF(X509) SEQ_CERT;
> 
> The next bit defines an ASN.1 module structure which says the SEQ_CERT
> is
> a SEQUENCE OF X509:
> 
> ASN1_ITEM_TEMPLATE(SEQ_CERT) =
>         ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, SeqCert, X509)
> ASN1_ITEM_TEMPLATE_END(SEQ_CERT)
> 
> Here SEQ_CERT is the structure name which that macro defines as a
> SEQUENCE OF
> X509. The "SeqCert" is just a string that is used as a name in the
> definition:
> it can be anything.
> 
> Now that's all very well but it doesn't actually define any functions.
> The bit
> that does that is this:
> 
> IMPLEMENT_ASN1_FUNCTIONS(SEQ_CERT)
> 
> This implements four functions but we're only interested in the encode
> and
> decode ones which look like this:
> 
>  int i2d_SEQ_CERT(SEQ_CERT *a, unsigned char **pp);
>  TYPE *d2i_SEQ_CERT(SEQ_CERT **a, unsigned char **pp, long length);
> 
> These behave like regular ASN.1 functions you pass in SEQ_CERT: which
> is
> STACK_OF(X509) to the i2d_SEQ_CERT and it encodes the result as a
> SEQUENCE
> OF X509 which is the same format as the original.
> 
> Similarly you can decode using d2i_SEQ_CERT() and get back a
> STACK_OF(X509).
> 
> If you have this in a separate module you can declare the new functions
> (e.g.
> in a header file) with:
> 
> DECLARE_ASN1_FUNCTIONS(SEQ_CERT)
> 
> Hope that helps. If you have any further problems let me know.
> 
> Steve.
> --
> Dr Stephen N. Henson. OpenSSL project core developer.
> Commercial tech support now available see: http://www.openssl.org
> --
> openssl-users mailing list
> To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users

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