- /* set the point conversion form */
- EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
- (params->base->data[0] & ~0x01));
-
+ /* extract the order */
+ if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL)
+ {
+ ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
+ goto err;
+ }
+ if (BN_is_negative(a) || BN_is_zero(a))
+ {
+ ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
+ goto err;
+ }
+ if (BN_num_bits(a) > (int)field_bits + 1) /* Hasse bound */
+ {
+ ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
+ goto err;
+ }
+
+ /* extract the cofactor (optional) */
+ if (params->cofactor == NULL)
+ {
+ if (b)
+ {
+ BN_free(b);
+ b = NULL;
+ }
+ }
+ else
+ if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL)
+ {
+ ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
+ goto err;
+ }
+ /* set the generator, order and cofactor (if present) */