>       From: [email protected] On Behalf Of Tatiana Evers
>       Sent: Wednesday, 07 December, 2011 08:17

>       Is there any function in OpenSSL (library) to get signature 
> algorithm from a certificate? I need to block MD5 certificates.

No; a good deal of the X509_ interface dates back to early days 
before there was an effort to hide data structures.
Just use x509->sig_alg->algorithm and maybe OBJ_obj2nid .

Or, you could use FIPS mode (of a FIPS build, but the last 
validation is a bit out of date now; a new one is in progress 
but they usually take several months, sometimes many months).
FIPS mode restricts algorithms to those approved by NIST, 
and MD5 is not among them. :-) :-( :-?


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