ec_GFp_simple_group_set_curve
int ec_GFp_simple_group_set_curve(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
.group_set_curve = ec_GFp_simple_group_set_curve,