NAME

       gnutls_x509_crt_get_issuer_alt_name - API function

SYNOPSIS

       #include <gnutls/x509.h>

       int  gnutls_x509_crt_get_issuer_alt_name(gnutls_x509_crt_t  cert, unsigned int seq, void *
       ian, size_t * ian_size, unsigned int * critical);

ARGUMENTS

       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 * ian  is the place where the alternative name will be copied to

       size_t * ian_size
                   holds the size of ian.

       unsigned int * critical
                   will be non-zero if the extension is marked as critical (may be null)

DESCRIPTION

       This  function  retrieves  the Issuer Alternative Name (2.5.29.18), 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 Issuer AltName is recognized.

RETURNS

       the    alternative    issuer    name    type   on   success,   one   of   the   enumerated
       gnutls_x509_subject_alt_name_t.  It will return GNUTLS_E_SHORT_MEMORY_BUFFER if   ian_size
       is  not  large  enough to hold the value.  In that case  ian_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.

SINCE

       2.10.0

REPORTING BUGS

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

COPYRIGHT

       Copyright © 2001-2021 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

       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

       http://www.gnutls.org/manual/