NID_crl_reason
if (!X509_REVOKED_add1_ext_i2d(rev, NID_crl_reason, rtmp, 0, 0))
reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason,
{"CRLReason","X509v3 CRL Reason Code",NID_crl_reason,3,&(lvalues[751]),0},
.ext_nid = NID_crl_reason,