+
+
+/* Functions for point multiplication.
+ *
+ * If group->meth->mul is 0, we use the wNAF-based implementations in ec_mult.c;
+ * otherwise we dispatch through methods.
+ */
+
+int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
+ size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *ctx)
+ {
+ if (group->meth->mul == 0)
+ /* use default */
+ return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
+
+ return group->meth->mul(group, r, scalar, num, points, scalars, ctx);
+ }
+
+int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
+ const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
+ {
+ /* just a convenient interface to EC_POINTs_mul() */
+
+ const EC_POINT *points[1];
+ const BIGNUM *scalars[1];
+
+ points[0] = point;
+ scalars[0] = p_scalar;
+
+ return EC_POINTs_mul(group, r, g_scalar, (point != NULL && p_scalar != NULL), points, scalars, ctx);
+ }
+
+int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
+ {
+ if (group->meth->mul == 0)
+ /* use default */
+ return ec_wNAF_precompute_mult(group, ctx);
+
+ if (group->meth->precompute_mult != 0)
+ return group->meth->precompute_mult(group, ctx);
+ else
+ return 1; /* nothing to do, so report success */
+ }
+
+int EC_GROUP_have_precompute_mult(const EC_GROUP *group)
+ {
+ if (group->meth->mul == 0)
+ /* use default */
+ return ec_wNAF_have_precompute_mult(group);
+
+ if (group->meth->have_precompute_mult != 0)
+ return group->meth->have_precompute_mult(group);
+ else
+ return 0; /* cannot tell whether precomputation has been performed */
+ }
+
+/* ec_precompute_mont_data sets |group->mont_data| from |group->order| and
+ * returns one on success. On error it returns zero. */
+int ec_precompute_mont_data(EC_GROUP *group)
+ {
+ BN_CTX *ctx = BN_CTX_new();
+ int ret = 0;
+
+ if (!EC_GROUP_VERSION(group))
+ goto err;
+
+ if (group->mont_data)
+ {
+ BN_MONT_CTX_free(group->mont_data);
+ group->mont_data = NULL;
+ }
+
+ if (ctx == NULL)
+ goto err;
+
+ group->mont_data = BN_MONT_CTX_new();
+ if (!group->mont_data)
+ goto err;
+
+ if (!BN_MONT_CTX_set(group->mont_data, &group->order, ctx))
+ {
+ BN_MONT_CTX_free(group->mont_data);
+ group->mont_data = NULL;
+ goto err;
+ }
+
+ ret = 1;
+
+err:
+
+ if (ctx)
+ BN_CTX_free(ctx);
+ return ret;
+ }