Manual Reference Pages - GNUTLS_X509_CRT_GET_SUBJECT_ALT_NAME (3)
gnutls_x509_crt_get_subject_alt_name - API function
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);
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 (18.104.22.168), contained
in the given certificate in the X509v3 Certificate Extensions.
When the SAN type is otherName, it will extract the data in the
otherNames 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.,
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
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 <firstname.lastname@example.org>.
Home page: http://www.gnutls.org
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