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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURNS | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
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gnutls_x509_c...ject_alt_name(3) gnutls gnutls_x509_c...ject_alt_name(3)
gnutls_x509_crt_get_subject_alt_name - API function
#include <gnutls/x509.h>
int gnutls_x509_crt_get_subject_alt_name(gnutls_x509_crt_t cert,
unsigned int seq, void * san, size_t * san_size, unsigned int *
critical);
gnutls_x509_crt_t cert
should contain a gnutls_x509_crt_t type
unsigned int seq
specifies the sequence number of the alt name (0 for
the first one, 1 for the second etc.)
void * san is the place where the alternative name will be copied
to
size_t * san_size
holds the size of san.
unsigned int * critical
will be non-zero if the extension is marked as
critical (may be null)
This function retrieves the Alternative Name (2.5.29.17),
contained in the given certificate in the X509v3 Certificate
Extensions.
When the SAN type is otherName, it will extract the data in the
otherName's value field, and GNUTLS_SAN_OTHERNAME is returned.
You may use gnutls_x509_crt_get_subject_alt_othername_oid() to get
the corresponding OID and the "virtual" SAN types (e.g.,
GNUTLS_SAN_OTHERNAME_XMPP).
If an otherName OID is known, the data will be decoded. Otherwise
the returned data will be DER encoded, and you will have to decode
it yourself. Currently, only the RFC 3920 id-on-xmppAddr SAN is
recognized.
the alternative subject name type on success, one of the
enumerated gnutls_x509_subject_alt_name_t. It will return
GNUTLS_E_SHORT_MEMORY_BUFFER if san_size is not large enough to
hold the value. In that case san_size will be updated with the
required size. If the certificate does not have an Alternative
name with the specified sequence number then
GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE is 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...ject_alt_name(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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