          var h = this[i++] >> 15;
            var m = xh * l + h * xl;
            l = xl * l + ((m & 0x7fff) << 15) + w[j] + (c & 0x3fffffff);
            c = (l >>> 30) + (m >>> 15) + xh * h + (c >>> 30);
            w[j++] = l & 0x3fffffff;
        }
        return c;
    }

// Alternately, set max digit bits to 28 since some
// browsers slow down when dealing with 32-bit numbers.
    function am3(i, x, w, j, c, n) {
        var xl = x & 0x3fff, xh = x >> 14;
        while (--n >= 0) {
            var l