NAME         top

       gnutls_x509_crt_get_authority_info_access - API function

SYNOPSIS         top

       #include <gnutls/x509.h>

       int gnutls_x509_crt_get_authority_info_access(gnutls_x509_crt_t crt,
       unsigned int seq, int what, gnutls_datum_t * data, unsigned int *

ARGUMENTS         top

       gnutls_x509_crt_t crt
                   Holds the certificate

       unsigned int seq
                   specifies the sequence number of the access descriptor (0
                   for the first one, 1 for the second etc.)

       int what    what data to get, a gnutls_info_access_what_t type.

       gnutls_datum_t * data
                   output data to be freed with gnutls_free().

       unsigned int * critical
                   pointer to output integer that is set to non-zero if the
                   extension is marked as critical (may be NULL)

DESCRIPTION         top

       Note that a simpler API to access the authority info data is provided
       by gnutls_x509_aia_get() and gnutls_x509_ext_import_aia().

       This function extracts the Authority Information Access (AIA)
       extension, see RFC 5280 section for more information.  The
       AIA extension holds a sequence of AccessDescription (AD) data.

       The  seq input parameter is used to indicate which member of the
       sequence the caller is interested in.  The first member is 0, the
       second member 1 and so on.  When the  seq value is out of bounds,

       The type of data returned in  data is specified via  what which
       should be gnutls_info_access_what_t values.

       If  what is GNUTLS_IA_ACCESSMETHOD_OID then  data will hold the
       accessMethod OID (e.g., "").

       hold the accessLocation GeneralName type (e.g.,

       If  what is GNUTLS_IA_URI,  data will hold the accessLocation URI
       data.  Requesting this  what value leads to an error if the
       accessLocation is not of the "uniformResourceIdentifier" type.

       If  what is GNUTLS_IA_OCSP_URI,  data will hold the OCSP URI.
       Requesting this  what value leads to an error if the accessMethod is
       not aka OCSP, or if accessLocation is not of the
       "uniformResourceIdentifier" type. In that case
       GNUTLS_E_UNKNOWN_ALGORITHM will be returned, and  seq should be
       increased and this function called again.

       If  what is GNUTLS_IA_CAISSUERS_URI,  data will hold the caIssuers
       URI.  Requesting this  what value leads to an error if the
       accessMethod is not aka caIssuers, or if
       accessLocation is not of the "uniformResourceIdentifier" type.  In
       that case handle as in GNUTLS_IA_OCSP_URI.

       More  what values may be allocated in the future as needed.

       If  data is NULL, the function does the same without storing the
       output data, that is, it will set  critical and do error checking as

       The value of the critical flag is returned in * critical .  Supply a
       NULL  critical if you want the function to make sure the extension is
       non-critical, as required by RFC 5280.

RETURNS         top

       GNUTLS_E_SUCCESS on success, GNUTLS_E_INVALID_REQUEST on invalid  crt
       , GNUTLS_E_CONSTRAINT_ERROR if the extension is incorrectly marked as
       critical (use a non-NULL  critical to override),
       GNUTLS_E_UNKNOWN_ALGORITHM if the requested OID does not match (e.g.,
       when using GNUTLS_IA_OCSP_URI), otherwise a negative error code.

SINCE         top


REPORTING BUGS         top

       Report bugs to <>.
       Home page:

COPYRIGHT         top

       Copyright © 2001-2017 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         top

       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 

COLOPHON         top

       This page is part of the GnuTLS (GnuTLS Transport Layer Security
       Library) project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, send it to  This page was obtained from the
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gnutls                          gnut3l.s6_.x1509_crt_get_authority_info_access(3)