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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURNS | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
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gnutls_x509_c...xtension_info(3) gnutls gnutls_x509_c...xtension_info(3)
gnutls_x509_crt_get_extension_info - API function
#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 *
critical);
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.
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, then
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).
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 returned.
Report bugs to <bugs@gnutls.org>.
Home page: https://www.gnutls.org
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.
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
https://www.gnutls.org/manual/
This page is part of the GnuTLS (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 is not part of the original manual page),
send a mail to man-pages@man7.org
gnutls 3.8.10 gnutls_x509_c...xtension_info(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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