CMS_set1_signers_certs
CMS_set1_signers_certs(cms, NULL, 0);
CMS_set1_signers_certs(cms, idctx->trustedCAs, CMS_NOINTERN);
CMS_set1_signers_certs(cms, idctx->intermediateCAs, CMS_NOINTERN);
scount += CMS_set1_signers_certs(cms, certs, flags);
int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *certs,