NID_ecdsa_with_SHA256 is not the name of a curve.
NID_secp256k1 is probably a good choice. Refer to the following
document for a discussion on recommended curves (appendix d), and then
find the related NID name for the curve you want in OpenSSL:
http://csrc.nist.gov/publications/fips/fips186-3/fips_186-3.pdf
Matt
On 22 May 2012 16:07, Khuc, Chuong D. <ck...@swri.org> wrote:
> Hi,
> I got a problem with
> EC_KEY_new_by_curve_name: it always return NULL. Here is how I used it:
> EC_KEY *eckey = EC_KEY_new_by_curve_name(NID_ecdsa_with_SHA256);
> If(eckey == NULL)
> {
> printf("ERROR: NULL ECKEY!\r\n");
> }
> Do you happen to know the reason?
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