opaque X509 struct issues

[Daniel Stenberg]

Hey,

In the curl project we're accessing the 'cert_info' to find the 
'signature->algorithm' fields from the X509 and X509_CINF structs [*] and we 
can't build with openssl git master or the 1.1.0-pre release.

How can we reach that info using a "proper" API?

Making all in lib
   CC       vtls/libcurl_la-openssl.lo
vtls/openssl.c: In function 'get_cert_chain':
vtls/openssl.c:2347:13: error: dereferencing pointer to incomplete type 'X509 
{aka struct x509_s\
t}'
      cinf = x->cert_info;
              ^
vtls/openssl.c:2349:30: error: dereferencing pointer to incomplete type 
'X509_CINF {aka struct x\
509_cinf_st}'
      i2a_ASN1_OBJECT(mem, cinf->signature->algorithm);
                               ^
Makefile:1868: recipe for target 'vtls/libcurl_la-openssl.lo' failed

We support building with OpenSSL 0.9.7+ and we're looking for a way to keep 
that while at the same time support the latest versions!

[*] = https://github.com/bagder/curl/blob/master/lib/vtls/openssl.c#L2346


-- 

  / daniel.haxx.se