/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

bmul : {n,m} (fin n, n >= 1, m == n*2 - 1) => [n] -> [n] -> ([n], [n])
bmul a b = (take`{n} prod, drop`{n} prod)
    where prod = pad (pmult a b : [m])
          pad x = zero # x