X509_REQ_new_ex
req = X509_REQ_new_ex(app_get0_libctx(), app_get0_propq());
ret = X509_REQ_new_ex(x->libctx, x->propq);
X509_REQ *X509_REQ_new_ex(OSSL_LIB_CTX *libctx, const char *propq);
csr = X509_REQ_new_ex(libctx, NULL);