gnutls_x509_crt_set_key_usage - Set the keyUsage extension
int gnutls_x509_crt_set_key_usage(gnutls_x509_crt_t crt, unsigned int
a certificate of type gnutls_x509_crt_t
unsigned int usage
an ORed sequence of the GNUTLS_KEY_* elements.
This function will set the keyUsage certificate extension.
On success, GNUTLS_E_SUCCESS is returned, otherwise a negative error
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