NAME

       gnutls_certificate_verify_peers - API function

SYNOPSIS

       #include <gnutls/gnutls.h>

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

ARGUMENTS

       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

DESCRIPTION

       This function will verify the peer's certificate and  store  the  status  in  the   status
       variable  as  a bitwise or'd 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.

       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.,
       GNUTLS_KP_TLS_WWW_SERVER).

       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
       the GNUTLS_CERT_SIGNER_CONSTRAINTS_FAILURE flag set.

RETURNS

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

SINCE

       3.3.0

REPORTING BUGS

       Report bugs to <bugs@gnutls.org>.
       Home page: http://www.gnutls.org

COPYRIGHT

       Copyright © 2001-2022 Free Software Foundation, Inc., and others.
       Copying and distribution of this file, with or without modification, are permitted in  any
       medium without royalty provided the copyright notice and this notice are preserved.

SEE ALSO

       The   full   documentation  for  gnutls  is  maintained  as  a  Texinfo  manual.   If  the
       /usr/share/doc/gnutls/ directory does not contain the HTML form visit

       http://www.gnutls.org/manual/