@deftypefun {int} {gnutls_x509_crt_set_subject_alt_name} (gnutls_x509_crt_t @var{crt}, gnutls_x509_subject_alt_name_t @var{type}, const void * @var{data}, unsigned int @var{data_size}, unsigned int @var{flags})
@var{crt}: a certificate of type @code{gnutls_x509_crt_t} 

@var{type}: is one of the gnutls_x509_subject_alt_name_t enumerations

@var{data}: The data to be set

@var{data_size}: The size of data to be set

@var{flags}: GNUTLS_FSAN_SET to clear previous data or GNUTLS_FSAN_APPEND to append. 

This function will set the subject alternative name certificate
extension. It can set the following types: @code{GNUTLS_SAN_DNSNAME}  as a text string,
@code{GNUTLS_SAN_RFC822NAME}  as a text string, @code{GNUTLS_SAN_URI}  as a text string,
@code{GNUTLS_SAN_IPADDRESS}  as a binary IP address (4 or 16 bytes),
@code{GNUTLS_SAN_OTHERNAME_XMPP}  as a UTF8 string (since 3.5.0).

Since version 3.5.7 the @code{GNUTLS_SAN_RFC822NAME} , @code{GNUTLS_SAN_DNSNAME} , and
@code{GNUTLS_SAN_OTHERNAME_XMPP}  are converted to ACE format when necessary.

@strong{Returns:} On success, @code{GNUTLS_E_SUCCESS}  (0) is returned, otherwise a
negative error value.

@strong{Since:} 2.6.0
@end deftypefun