On 19 December 2013 18:52, Billy Brumley <bbrum...@gmail.com> wrote: > It's in the EC_GROUP structure: group->field. Check crypto/ec/ec_lcl.h. BBB >
Anything in the *lcl.h header files does not form part of the public API and you shouldn't really rely on it as it may change. Better is to use: int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *ctx); or int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *ctx); as appropriate dependent on the type of curve that you have. > On Thu, Dec 19, 2013 at 9:54 AM, Patrick McCorry <stonecold...@gmail.com> > wrote: >>>>> From what I can see in the implementation (ecs_ossl.c) when using >>>> ecdsa_sign_setup - the 'q' field size is never used! >>>> >>>> /* >>>> * Does the multiplciation of G (generator) * k to produce curve point (x,y) >>>> */ >>>> EC_POINT_mul(group, temp_point, k, NULL, NULL, ctx) >>>> What you call 'q' (called 'p' within openssl) is used in this operation. It is a parameter of the group and is required to do the point multiplication. Matt ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
