EVP_MD_meth_set_flags
|| !EVP_MD_meth_set_flags(md, 0)
|| !EVP_MD_meth_set_flags(_hidden_sha1_md, EVP_MD_FLAG_DIGALGID_ABSENT)
|| !EVP_MD_meth_set_flags(md, EVP_MD_FLAG_DIGALGID_ABSENT)
|| !EVP_MD_meth_set_flags(md, EVP_MD_FLAG_DIGALGID_ABSENT)
|| !EVP_MD_meth_set_flags(md, EVP_MD_FLAG_DIGALGID_ABSENT)
|| !EVP_MD_meth_set_flags(md, EVP_MD_FLAG_DIGALGID_ABSENT)
|| !EVP_MD_meth_set_flags(md, 0)
int EVP_MD_meth_set_flags(EVP_MD *md, unsigned long flags);