gnutls_x509_crt_get_extension_info(3) — Linux manual page



NAME         top

       gnutls_x509_crt_get_extension_info - API function

SYNOPSIS         top

       #include <gnutls/x509.h>

       int gnutls_x509_crt_get_extension_info(gnutls_x509_crt_t cert,
       unsigned indx, void * oid, size_t * oid_size, unsigned int *

ARGUMENTS         top

       gnutls_x509_crt_t cert
                   should contain a gnutls_x509_crt_t type

       unsigned indx
                   Specifies which extension OID to send. Use (0) to get
                   the first one.

       void * oid  a pointer to a structure to hold the OID

       size_t * oid_size
                   initially holds the maximum size of  oid , on return
                   holds actual size of  oid .

       unsigned int * critical
                   output variable with critical flag, may be NULL.

DESCRIPTION         top

       This function will return the requested extension OID in the
       certificate, and the critical flag for it.  The extension OID
       will be stored as a string in the provided buffer.  Use
       gnutls_x509_crt_get_extension() to extract the data.

       If the buffer provided is not long enough to hold the output,
        oid_size is updated and GNUTLS_E_SHORT_MEMORY_BUFFER will be
       returned. The  oid returned will be null terminated, although
        oid_size will not account for the trailing null (the latter is
       not true for GnuTLS prior to 3.6.0).

RETURNS         top

       On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a
       negative error code is returned.  If you have reached the last
       extension available GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be

REPORTING BUGS         top

       Report bugs to <>.
       Home page:

COPYRIGHT         top

       Copyright © 2001- 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-3.8.0.tar.xz fetched from
       ⟨⟩ on 2023-06-23.  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original
       manual page), send a mail to

gnutls                            3.g8n.u0tls_x509_crt_get_extension_info(3)