[openssl-users] Help finding replacement for ASN1_seq_unpack_X509

Thu Jul 21 01:29:15 UTC 2016

Thanks much....I have a corollary question if you don't mind.  In OpenSSL
1.1.0, what is the accepted procedure to convert a STACK_OF(X509) to DER?

Would it be acceptable to just iterate the stack elements, passing each X509
through i2d_X509 and appending the results -- would that generate valid DER?
Is there a better way?

> -----Original Message-----
> From: openssl-users [mailto:openssl-users-bounces at openssl.org] On
> Behalf Of Dr. Stephen Henson
> Sent: Tuesday, July 19, 2016 6:10 PM
> To: openssl-users at openssl.org
> Subject: Re: [openssl-users] Help finding replacement for
> ASN1_seq_unpack_X509
> 
> On Tue, Jul 19, 2016, Jim Carroll wrote:
> 
> > OpenSSL 1.1.0 has upgraded the safestack.h macro system, but I'm
> having
> > difficulty understanding the changes. I'm porting a piece of code
> from
> > OpenSSL 0.9.8 that uses ASN1_seq_unpack_X509. In 0.9.8, safestack.h
> had this
> > definition.
> >
> > #define ASN1_seq_unpack_X509(buf, len, d2i_func, free_func) \
> >
> >         SKM_ASN1_seq_unpack(X509, (buf), (len), (d2i_func),
> (free_func))
> >
> > Could anyone point me in the right direction and how this needs to be
> > adapted?
> >
> >
> 
> Ah, that uses some ancient stuff which is originally from OpenSSL
> 0.9.6. For
> 1.1.0 this has changed. You need to create a typedef for a
> STACK_OF(X509) and
> then define ASN.1 functions for it for a SEQUENCE OF X509. That is a
> lot
> easier than it sounds. This should do it:
> 
> #include <openssl/x509.h>
> #include <openssl/asn1t.h>
> 
> typedef STACK_OF(X509) SEQ_CERT;
> 
> ASN1_ITEM_TEMPLATE(SEQ_CERT) =
>         ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, SeqCert, X509)
> ASN1_ITEM_TEMPLATE_END(SEQ_CERT)
> 
> IMPLEMENT_ASN1_FUNCTIONS(SEQ_CERT)
> 
> This defines a function d2i_SEQ_CERT() which replaces the original
> macro.
> 
> Note that this construct should also work in earlier versions of
> OpenSSL too
> including 0.9.8.
> 
> 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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