CMS_SignerInfo_get0_signer_id
int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si, ASN1_OCTET_STRING **keyid,
LCRYPTO_ALIAS(CMS_SignerInfo_get0_signer_id);
LCRYPTO_USED(CMS_SignerInfo_get0_signer_id);
if (CMS_SignerInfo_get0_signer_id(si, &kid, NULL, NULL) != 1 ||