On Tue, 2022-01-04 at 16:46 +0000, Blumenthal, Uri - 0553 - MITLL wrote: > On 1/4/22, 11:23, "Tomas Mraz" <tomas@xxxxxxxxxxx> wrote: > > > > Theoretically, shouldn’t > > > > > > EVP_PKEY_get_int_param(pkey, OSSL_PARAM_EC_ORDER, &(unsigned > > int)order) > > > > > > work? I verified that it does not seem to work, at least in the > > > obvious context. > > > > OSSL_PARAM_EC_ORDER is an unsigned integer (also a bignum) and it > > won't > > fit into int. So that's the reason why that call fails. > > In other words, the man page says it's unsigned int, but in fact it's > BIGNUM? Because the pointer I gave was to "unsigned int", like in the > OP's code. The param is too big to fit into int. If you were using some ridiculously small EC curve the call would succeed. The parameter types != C types and the manual page does not say "unsigned int" but "unsigned integer" for a reason. -- Tomáš Mráz, OpenSSL
