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       gnutls_certificate_verify_peers - API function


       #include <gnutls/gnutls.h>

       int   gnutls_certificate_verify_peers(gnutls_session_t  session,  gnutls_typed_vdata_st  *
       data, unsigned int elements, unsigned int * status);


       gnutls_session_t session
                   is a gnutls session

       gnutls_typed_vdata_st * data
                   an array of typed data

       unsigned int elements
                   the number of data elements

       unsigned int * status
                   is the output of the verification


       This function will verify the peer's certificate and store the the status in  the   status
       variable  as a bitwise OR of gnutls_certificate_status_t values or zero if the certificate
       is trusted. Note that value in  status is set only when the return value of this  function
       is  success  (i.e, failure to trust a certificate does not imply a negative return value).
       The  default  verification  flags  used  by  this  function  can   be   overridden   using
       gnutls_certificate_set_verify_flags().        See        the        documentation       of
       gnutls_certificate_verify_peers2() for details in the verification process.

       This function will take into account the stapled OCSP responses sent  by  the  server,  as
       well as the following X.509 certificate extensions: Name Constraints, Key Usage, and Basic
       Constraints (pathlen).

       The  acceptable   data  types   are   GNUTLS_DT_DNS_HOSTNAME,   GNUTLS_DT_RFC822NAME   and
       GNUTLS_DT_KEY_PURPOSE_OID.   The  former  two accept as data a null-terminated hostname or
       email   address,   and   the   latter   a   null-terminated   object   identifier   (e.g.,

       If  a  DNS  hostname  is  provided  then  this  function  will compare the hostname in the
       certificate against the given. If names  do  not  match  the  GNUTLS_CERT_UNEXPECTED_OWNER
       status  flag  will  be  set.   If  a  key  purpose OID is provided and the end-certificate
       contains the extended key usage PKIX extension,  it  will  be  required  to  be  have  the
       provided key purpose or be marked for any purpose, otherwise verification status will have

       To avoid denial of service attacks some default upper limits regarding the certificate key
       size and chain size are set. To override them use gnutls_certificate_set_verify_limits().

       Note  that  when  using  raw  public-keys  verification  will not work because there is no
       corresponding certificate body belonging to the raw key that can be verified. In that case
       this function will return GNUTLS_E_INVALID_REQUEST.


       GNUTLS_E_SUCCESS (0) when the validation is performed, or a negative error code otherwise.
       A successful error code means that the  status parameter must be  checked  to  obtain  the
       validation status.




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