On Tue, 2022-01-04 at 17:02 +0000, Blumenthal, Uri - 0553 - MITLL wrote: > > > 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. > > Yes, that makes sense. > > But, considering that the man pages describe C API, wouldn't it be > nice to mention (even though it may be obvious that a number of order > 2^384 might not fit into 32 or even 64 bits) that the actual type is > BIGNUM? No, the type is not a BIGNUM. Please read "man OSSL_PARAM" it contains the information on what types OSSL_PARAM support. > Also, what should arguments to that C call EVP_PKEY_get_int_param() > look like to succeed? Do I need to pass a pointer to BN there??? Please read "man EVP_PKEY_get_int_param". -- Tomáš Mráz, OpenSSL
