GetIDFromSPKI
extern KMF_RETURN GetIDFromSPKI(KMF_X509_SPKI *, KMF_DATA *);
ret = GetIDFromSPKI(&cert->certificate.subjectPublicKeyInfo, ID);
rv = GetIDFromSPKI(&signed_cert_ptr->certificate.subjectPublicKeyInfo,
rv = GetIDFromSPKI(pubkey, &Id);