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Unified Diff: mozilla/security/nss/lib/freebl/ecl/ec_naf.c

Issue 14249009: Change the NSS and NSPR source tree to the new directory structure to be (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/deps/third_party/nss/
Patch Set: Created 7 years, 8 months ago
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Index: mozilla/security/nss/lib/freebl/ecl/ec_naf.c
===================================================================
--- mozilla/security/nss/lib/freebl/ecl/ec_naf.c (revision 191424)
+++ mozilla/security/nss/lib/freebl/ecl/ec_naf.c (working copy)
@@ -1,69 +0,0 @@
-/* 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_sub_d(&k, out[i], &k);
- } else {
- mp_add_d(&k, -(out[i]), &k);
- }
- } else {
- out[i] = 0;
- }
- 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;
-
-}
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