gnutls_x509_crt_get_extension_info(3)

NAME
gnutls_x509_crt_get_extension_info - API function

SYNOPSIS
#include <gnutls/x509.h>

int gnutls_x509_crt_get_extension_info(gnutls_x509_crt_t cert, unsigned indx, void * oid, size_t * oid_size, unsigned int * critical);

ARGUMENTS

gnutls_x509_crt_t cert
    should contain a gnutls_x509_crt_t type

unsigned indx
    Specifies which extension OID to send. Use (0) to get the first one.

void * oid
    a pointer to a structure to hold the OID

size_t * oid_size
    initially holds the maximum size of oid , on return holds actual size of oid .

unsigned int * critical
    output variable with critical flag, may be NULL.

DESCRIPTION
This function will return the requested extension OID in the certificate, and the critical flag for it. The extension OID will be stored as a string in the provided buffer. Use gnutls_x509_crt_get_extension() to extract the data. If the buffer provided is not long enough to hold the output, then
 oid_size is updated and GNUTLS_E_SHORT_MEMORY_BUFFER will be returned. The oid returned will be null terminated, although
 oid_size will not account for the trailing null (the latter is not true for GnuTLS prior to 3.6.0).

RETURNS
On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error code is returned. If you have reached the last extension available GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.

REPORTING BUGS
Report bugs to <bugs@gnutls.org>.
Home page: https://www.gnutls.org

COPYRIGHT
Copyright © 2001-2019 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

https://www.gnutls.org/manual/