Question

If there a way to insert custom parameters into the GOST 2001 parameters set programmatically and what API should be used? After being managed to generate EVP_PKEY by simulating OpenSSLs’ function I found out that parameters are bound to NID, so there’s a need in adding custom ones there. Ideas anyone?

Answer 1

Problem solved next way:

1. Upper error FILL_GOST2001_PARAMS:unsupported parameter set appears if you don’t set your CurveName as one of already existing parameter set NID, so it should be like this: EC_GROUP_set_curve_name(CurveGroup,NID_id_GostR3410_2001_TestParamSet).
2. However setting one for default parameters set doesn’t mean that It’ll be used every time, for example in EC_KEY_check_key() function, you call it. What OpenSSL does is – it takes parameters from your EC_KEY object, so it’s easily customizable, as long as those are correct (point is on curve and etc.).