kmf_get_cert_ku
extern KMF_RETURN kmf_get_cert_ku(const KMF_DATA *, KMF_X509EXT_KEY_USAGE *);
ret = kmf_get_cert_ku(cert, &keyusage);
ret = kmf_get_cert_ku(cert, &keyusage);
rv = kmf_get_cert_ku((const KMF_DATA *)cert, &keyUsage);
if ((rv = kmf_get_cert_ku(cert, &kuext)) != KMF_OK &&