CMS_ATTR_F_SIGNED
if (!cms_check_attribute(nid, flags, CMS_ATTR_F_SIGNED,
{ NID_pkcs9_contentType, CMS_ATTR_F_SIGNED | CMS_ATTR_F_ONLY_ONE | CMS_ATTR_F_ONE_ATTR_VALUE | CMS_ATTR_F_REQUIRED_COND },
{ NID_pkcs9_messageDigest, CMS_ATTR_F_SIGNED | CMS_ATTR_F_ONLY_ONE | CMS_ATTR_F_ONE_ATTR_VALUE | CMS_ATTR_F_REQUIRED_COND },
{ NID_pkcs9_signingTime, CMS_ATTR_F_SIGNED | CMS_ATTR_F_ONLY_ONE | CMS_ATTR_F_ONE_ATTR_VALUE },
{ NID_id_smime_aa_signingCertificate, CMS_ATTR_F_SIGNED | CMS_ATTR_F_ONLY_ONE | CMS_ATTR_F_ONE_ATTR_VALUE },
{ NID_id_smime_aa_signingCertificateV2, CMS_ATTR_F_SIGNED | CMS_ATTR_F_ONLY_ONE | CMS_ATTR_F_ONE_ATTR_VALUE },
{ NID_id_smime_aa_receiptRequest, CMS_ATTR_F_SIGNED | CMS_ATTR_F_ONLY_ONE | CMS_ATTR_F_ONE_ATTR_VALUE }