NID_pkcs9_messageDigest
OBJ_nid2obj(NID_pkcs9_messageDigest), -3, V_ASN1_OCTET_STRING);
if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
OBJ_nid2obj(NID_pkcs9_messageDigest), -3,
{"messageDigest","messageDigest",NID_pkcs9_messageDigest,9,
!PKCS7_add_signed_attribute(si, NID_pkcs9_messageDigest,
if (!(astype = get_attribute(sk, NID_pkcs9_messageDigest)))