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gnutls_x509_crt_get_extension_info(3) — Linux manual page

gnutls_x509_c...xtension_info(3)  gnutlsgnutls_x509_c...xtension_info(3)

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_tcert,unsignedindx, void *oid, size_t *oid_size, unsigned int *critical);

ARGUMENTS        top

       gnutls_x509_crt_t cert                   should contain agnutls_x509_crt_ttype       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 ofoid , on return                   holds actual size ofoid .       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.  Usegnutls_x509_crt_get_extension()to extract the data.       If the buffer provided is not long enough to hold the output, thenoid_size is updated andGNUTLS_E_SHORT_MEMORY_BUFFERwill be       returned. Theoid returned will be null terminated, althoughoid_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       availableGNUTLS_E_REQUESTED_DATA_NOT_AVAILABLEwill be returned.

REPORTING BUGS        top

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

COPYRIGHT        top

       Copyright © 2001-2023 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 forgnutlsis maintained as a Texinfo       manual.  If the /usr/share/doc/gnutls/ directory does not contain       the HTML form visithttps://www.gnutls.org/manual/

COLOPHON        top

       This page is part of theGnuTLS (GnuTLS Transport Layer Security       Library) project.  Information about the project can be found at       ⟨http://www.gnutls.org/⟩.  If you have a bug report for this       manual page, send it to bugs@gnutls.org.  This page was obtained       from the tarball fetched from       ⟨https://www.gnupg.org/ftp/gcrypt/gnutls/⟩ on 2025-08-11.  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 isnot part of the original manual page),       send a mail to man-pages@man7.orggnutls                            3.8.10gnutls_x509_c...xtension_info(3)

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