gnutls_x509_crt_get_key_purpose_oid(3)

NAME
gnutls_x509_crt_get_key_purpose_oid - API function

SYNOPSIS
#include <gnutls/x509.h>

int gnutls_x509_crt_get_key_purpose_oid(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
    This specifies which OID to return. Use (0) to get the first one.

void * oid
    a pointer to a buffer to hold the OID (may be null)

size_t * oid_size
    initially holds the size of oid

unsigned int * critical
    output flag to indicate criticality of extension

DESCRIPTION
This function will extract the key purpose OIDs of the Certificate specified by the given index. These are stored in the Extended Key Usage extension (2.5.29.37) See the GNUTLS_KP_* definitions for human readable names. If oid is null then only the size will be filled. The oid returned will be null terminated, although oid_size will not account for the trailing null.

RETURNS
GNUTLS_E_SHORT_MEMORY_BUFFER if the provided buffer is not long enough, and in that case the *oid_size will be updated with the required size. On success 0 is returned.

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

COPYRIGHT
Copyright © 2001-2020 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/