Delete bundled copy of NSS and replace with README.

nss/lib/freebl/ecl/ec_naf.c

-/* 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/. */
-
-#include "ecl-priv.h"
-
-/* Returns 2^e as an integer. This is meant to be used for small powers of 
- * two. */
-int
-ec_twoTo(int e)
-{
-        int a = 1;
-        int i;
-
-        for (i = 0; i < e; i++) {
-                a *= 2;
-        }
-        return a;
-}
-
-/* Computes the windowed non-adjacent-form (NAF) of a scalar. Out should
- * be an array of signed char's to output to, bitsize should be the number 
- * of bits of out, in is the original scalar, and w is the window size.
- * NAF is discussed in the paper: D. Hankerson, J. Hernandez and A.
- * Menezes, "Software implementation of elliptic curve cryptography over
- * binary fields", Proc. CHES 2000. */
-mp_err
-ec_compute_wNAF(signed char *out, int bitsize, const mp_int *in, int w)
-{
-        mp_int k;
-        mp_err res = MP_OKAY;
-        int i, twowm1, mask;
-
-        twowm1 = ec_twoTo(w - 1);
-        mask = 2 * twowm1 - 1;
-
-        MP_DIGITS(&k) = 0;
-        MP_CHECKOK(mp_init_copy(&k, in));
-
-        i = 0;
-        /* Compute wNAF form */
-        while (mp_cmp_z(&k) > 0) {
-                if (mp_isodd(&k)) {
-                        out[i] = MP_DIGIT(&k, 0) & mask;
-                        if (out[i] >= twowm1)
-                                out[i] -= 2 * twowm1;
-
-                        /* Subtract off out[i].  Note mp_sub_d only works with
-                         * unsigned digits */
-                        if (out[i] >= 0) {
-                                MP_CHECKOK(mp_sub_d(&k, out[i], &k));
-                        } else {
-                                MP_CHECKOK(mp_add_d(&k, -(out[i]), &k));
-                        }
-                } else {
-                        out[i] = 0;
-                }
-                MP_CHECKOK(mp_div_2(&k, &k));
-                i++;
-        }
-        /* Zero out the remaining elements of the out array. */
-        for (; i < bitsize + 1; i++) {
-                out[i] = 0;
-        }
-  CLEANUP:
-        mp_clear(&k);
-        return res;
-
-}