gnutls_x509_crt_set_key_purpose_oid — API function


#include <gnutls/x509.h>

int gnutls_x509_crt_set_key_purpose_oid(gnutls_x509_crt_t cert, const void * oid, unsigned int critical);


gnutls_x509_crt_t cert

a certificate of type gnutls_x509_crt_t

const void * oid

a pointer to a null terminated string that holds the OID

unsigned int critical

Whether this extension will be critical or not


This function will set the key purpose OIDs of the Certificate. These are stored in the Extended Key Usage extension ( See the GNUTLS_KP_* definitions for human readable names.

Subsequent calls to this function will append OIDs to the OID list.


On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error code is returned.

Reporting Bugs

Report bugs to <>.
Home page:

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


3.6.9 gnutls