OSSL_ESS_check_signing_certs
&& OSSL_ESS_check_signing_certs(ss, ssv2, chain, 1) > 0;
int ret = OSSL_ESS_check_signing_certs(ss, ssv2, chain, 1) > 0;
int OSSL_ESS_check_signing_certs(const ESS_SIGNING_CERT *ss,