char b1[] =
> "18679335321211177614181391980475641049275229937844945546185683145837";
>
Where did you get this value from? Is this a private key you have been
provided with that you *must* use?
Unless you particularly need to use a specific private key it is better to
use
EC_KEY_generate_key
This will create a private key for you as well as calculating the
associated public key.
> BN_dec2bn(&res,b1);
> // BN_dec2bn(&x,b1);
> // BN_dec2bn(&y,b1);
>
> // BN_dec2bn(&(pub_key->X), "1234567890123456789012345678");
> // BN_dec2bn(pub_key->Y, "1234567890123456789012345678");
>
>
> pkey = EC_KEY_new_by_curve_name(NID_secp224r1);
> group = EC_KEY_get0_group(pkey);
> pub_key = EC_POINT_new(group);
>
> ret = EC_KEY_set_private_key(pkey, res);
> //EC_KEY_set_public_key_affine_coordinates(pkey,x,y);
>
It appears you have commented out all of the code above to insert the
public key. This is probably why the EC_KEY_check_key call is failing. One
of the things this function checks is that the public key is sane.
In addition the code you have that is commented out above for the public
key looks very odd. The public key is not just any (x, y) co-ordinate - it
must point a point which is on the curve! Further it must be equal to the
curve generator multiplied by the private key. If you use the
EC_KEY_generate_key function referred to above then this will all be dealt
with for you. If however you need to calculate the public key itself from
an existing private key then use something like this to create it:
if (!EC_POINT_mul(group, pub_key, pkey, NULL, NULL, ctx))
goto err;
Matt
