NAME         top

       gnutls_certificate_verify_peers2 - API function

SYNOPSIS         top

       #include <gnutls/gnutls.h>

       int gnutls_certificate_verify_peers2(gnutls_session_t session,
       unsigned int * status);

ARGUMENTS         top

       gnutls_session_t session
                   is a gnutls session

       unsigned int * status
                   is the output of the verification

DESCRIPTION         top

       This function will verify the peer's certificate and store 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

       This function will take into account the OCSP Certificate Status TLS
       extension, as well as the following X.509 certificate extensions:
       Name Constraints, Key Usage, and Basic Constraints (pathlen).

       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 you must also check the peer's name in order to check if
       the verified certificate belongs to the actual peer, see
       gnutls_x509_crt_check_hostname(), or use

RETURNS         top

       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.

REPORTING BUGS         top

       Report bugs to <>.
       Home page:

COPYRIGHT         top

       Copyright © 2001-2018 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         top

       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 

COLOPHON         top

       This page is part of the GnuTLS (GnuTLS Transport Layer Security
       Library) project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, send it to  This page was obtained from the
       tarball gnutls-3.6.2.tar.xz fetched from
       ⟨⟩ on 2018-04-30.  If you discover
       any rendering problems in this HTML version of the page, or you
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gnutls                              3.6.2gnutls_certificate_verify_peers2(3)