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Unified Diff: nss/lib/freebl/ecl/ecp_jm.c

Issue 2078763002: Delete bundled copy of NSS and replace with README. (Closed) Base URL: https://chromium.googlesource.com/chromium/deps/nss@master
Patch Set: Delete bundled copy of NSS and replace with README. Created 4 years, 6 months ago
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Index: nss/lib/freebl/ecl/ecp_jm.c
diff --git a/nss/lib/freebl/ecl/ecp_jm.c b/nss/lib/freebl/ecl/ecp_jm.c
deleted file mode 100644
index 2d564127ceeac99b95cdde75b2045fe52d05c723..0000000000000000000000000000000000000000
--- a/nss/lib/freebl/ecl/ecp_jm.c
+++ /dev/null
@@ -1,289 +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 "ecp.h"
-#include "ecl-priv.h"
-#include "mplogic.h"
-#include <stdlib.h>
-
-#define MAX_SCRATCH 6
-
-/* Computes R = 2P. Elliptic curve points P and R can be identical. Uses
- * Modified Jacobian coordinates.
- *
- * Assumes input is already field-encoded using field_enc, and returns
- * output that is still field-encoded.
- *
- */
-static mp_err
-ec_GFp_pt_dbl_jm(const mp_int *px, const mp_int *py, const mp_int *pz,
- const mp_int *paz4, mp_int *rx, mp_int *ry, mp_int *rz,
- mp_int *raz4, mp_int scratch[], const ECGroup *group)
-{
- mp_err res = MP_OKAY;
- mp_int *t0, *t1, *M, *S;
-
- t0 = &scratch[0];
- t1 = &scratch[1];
- M = &scratch[2];
- S = &scratch[3];
-
-#if MAX_SCRATCH < 4
-#error "Scratch array defined too small "
-#endif
-
- /* Check for point at infinity */
- if (ec_GFp_pt_is_inf_jac(px, py, pz) == MP_YES) {
- /* Set r = pt at infinity by setting rz = 0 */
-
- MP_CHECKOK(ec_GFp_pt_set_inf_jac(rx, ry, rz));
- goto CLEANUP;
- }
-
- /* M = 3 (px^2) + a*(pz^4) */
- MP_CHECKOK(group->meth->field_sqr(px, t0, group->meth));
- MP_CHECKOK(group->meth->field_add(t0, t0, M, group->meth));
- MP_CHECKOK(group->meth->field_add(t0, M, t0, group->meth));
- MP_CHECKOK(group->meth->field_add(t0, paz4, M, group->meth));
-
- /* rz = 2 * py * pz */
- MP_CHECKOK(group->meth->field_mul(py, pz, S, group->meth));
- MP_CHECKOK(group->meth->field_add(S, S, rz, group->meth));
-
- /* t0 = 2y^2 , t1 = 8y^4 */
- MP_CHECKOK(group->meth->field_sqr(py, t0, group->meth));
- MP_CHECKOK(group->meth->field_add(t0, t0, t0, group->meth));
- MP_CHECKOK(group->meth->field_sqr(t0, t1, group->meth));
- MP_CHECKOK(group->meth->field_add(t1, t1, t1, group->meth));
-
- /* S = 4 * px * py^2 = 2 * px * t0 */
- MP_CHECKOK(group->meth->field_mul(px, t0, S, group->meth));
- MP_CHECKOK(group->meth->field_add(S, S, S, group->meth));
-
-
- /* rx = M^2 - 2S */
- MP_CHECKOK(group->meth->field_sqr(M, rx, group->meth));
- MP_CHECKOK(group->meth->field_sub(rx, S, rx, group->meth));
- MP_CHECKOK(group->meth->field_sub(rx, S, rx, group->meth));
-
- /* ry = M * (S - rx) - t1 */
- MP_CHECKOK(group->meth->field_sub(S, rx, S, group->meth));
- MP_CHECKOK(group->meth->field_mul(S, M, ry, group->meth));
- MP_CHECKOK(group->meth->field_sub(ry, t1, ry, group->meth));
-
- /* ra*z^4 = 2*t1*(apz4) */
- MP_CHECKOK(group->meth->field_mul(paz4, t1, raz4, group->meth));
- MP_CHECKOK(group->meth->field_add(raz4, raz4, raz4, group->meth));
-
-
- CLEANUP:
- return res;
-}
-
-/* Computes R = P + Q where R is (rx, ry, rz), P is (px, py, pz) and Q is
- * (qx, qy, 1). Elliptic curve points P, Q, and R can all be identical.
- * Uses mixed Modified_Jacobian-affine coordinates. Assumes input is
- * already field-encoded using field_enc, and returns output that is still
- * field-encoded. */
-static mp_err
-ec_GFp_pt_add_jm_aff(const mp_int *px, const mp_int *py, const mp_int *pz,
- const mp_int *paz4, const mp_int *qx,
- const mp_int *qy, mp_int *rx, mp_int *ry, mp_int *rz,
- mp_int *raz4, mp_int scratch[], const ECGroup *group)
-{
- mp_err res = MP_OKAY;
- mp_int *A, *B, *C, *D, *C2, *C3;
-
- A = &scratch[0];
- B = &scratch[1];
- C = &scratch[2];
- D = &scratch[3];
- C2 = &scratch[4];
- C3 = &scratch[5];
-
-#if MAX_SCRATCH < 6
-#error "Scratch array defined too small "
-#endif
-
- /* If either P or Q is the point at infinity, then return the other
- * point */
- if (ec_GFp_pt_is_inf_jac(px, py, pz) == MP_YES) {
- MP_CHECKOK(ec_GFp_pt_aff2jac(qx, qy, rx, ry, rz, group));
- MP_CHECKOK(group->meth->field_sqr(rz, raz4, group->meth));
- MP_CHECKOK(group->meth->field_sqr(raz4, raz4, group->meth));
- MP_CHECKOK(group->meth->
- field_mul(raz4, &group->curvea, raz4, group->meth));
- goto CLEANUP;
- }
- if (ec_GFp_pt_is_inf_aff(qx, qy) == MP_YES) {
- MP_CHECKOK(mp_copy(px, rx));
- MP_CHECKOK(mp_copy(py, ry));
- MP_CHECKOK(mp_copy(pz, rz));
- MP_CHECKOK(mp_copy(paz4, raz4));
- goto CLEANUP;
- }
-
- /* A = qx * pz^2, B = qy * pz^3 */
- MP_CHECKOK(group->meth->field_sqr(pz, A, group->meth));
- MP_CHECKOK(group->meth->field_mul(A, pz, B, group->meth));
- MP_CHECKOK(group->meth->field_mul(A, qx, A, group->meth));
- MP_CHECKOK(group->meth->field_mul(B, qy, B, group->meth));
-
- /* C = A - px, D = B - py */
- MP_CHECKOK(group->meth->field_sub(A, px, C, group->meth));
- MP_CHECKOK(group->meth->field_sub(B, py, D, group->meth));
-
- /* C2 = C^2, C3 = C^3 */
- MP_CHECKOK(group->meth->field_sqr(C, C2, group->meth));
- MP_CHECKOK(group->meth->field_mul(C, C2, C3, group->meth));
-
- /* rz = pz * C */
- MP_CHECKOK(group->meth->field_mul(pz, C, rz, group->meth));
-
- /* C = px * C^2 */
- MP_CHECKOK(group->meth->field_mul(px, C2, C, group->meth));
- /* A = D^2 */
- MP_CHECKOK(group->meth->field_sqr(D, A, group->meth));
-
- /* rx = D^2 - (C^3 + 2 * (px * C^2)) */
- MP_CHECKOK(group->meth->field_add(C, C, rx, group->meth));
- MP_CHECKOK(group->meth->field_add(C3, rx, rx, group->meth));
- MP_CHECKOK(group->meth->field_sub(A, rx, rx, group->meth));
-
- /* C3 = py * C^3 */
- MP_CHECKOK(group->meth->field_mul(py, C3, C3, group->meth));
-
- /* ry = D * (px * C^2 - rx) - py * C^3 */
- MP_CHECKOK(group->meth->field_sub(C, rx, ry, group->meth));
- MP_CHECKOK(group->meth->field_mul(D, ry, ry, group->meth));
- MP_CHECKOK(group->meth->field_sub(ry, C3, ry, group->meth));
-
- /* raz4 = a * rz^4 */
- MP_CHECKOK(group->meth->field_sqr(rz, raz4, group->meth));
- MP_CHECKOK(group->meth->field_sqr(raz4, raz4, group->meth));
- MP_CHECKOK(group->meth->
- field_mul(raz4, &group->curvea, raz4, group->meth));
-CLEANUP:
- return res;
-}
-
-/* Computes R = nP where R is (rx, ry) and P is the base point. Elliptic
- * curve points P and R can be identical. Uses mixed Modified-Jacobian
- * co-ordinates for doubling and Chudnovsky Jacobian coordinates for
- * additions. Assumes input is already field-encoded using field_enc, and
- * returns output that is still field-encoded. Uses 5-bit window NAF
- * method (algorithm 11) for scalar-point multiplication from Brown,
- * Hankerson, Lopez, Menezes. Software Implementation of the NIST Elliptic
- * Curves Over Prime Fields. */
-mp_err
-ec_GFp_pt_mul_jm_wNAF(const mp_int *n, const mp_int *px, const mp_int *py,
- mp_int *rx, mp_int *ry, const ECGroup *group)
-{
- mp_err res = MP_OKAY;
- mp_int precomp[16][2], rz, tpx, tpy;
- mp_int raz4;
- mp_int scratch[MAX_SCRATCH];
- signed char *naf = NULL;
- int i, orderBitSize;
-
- MP_DIGITS(&rz) = 0;
- MP_DIGITS(&raz4) = 0;
- MP_DIGITS(&tpx) = 0;
- MP_DIGITS(&tpy) = 0;
- for (i = 0; i < 16; i++) {
- MP_DIGITS(&precomp[i][0]) = 0;
- MP_DIGITS(&precomp[i][1]) = 0;
- }
- for (i = 0; i < MAX_SCRATCH; i++) {
- MP_DIGITS(&scratch[i]) = 0;
- }
-
- ARGCHK(group != NULL, MP_BADARG);
- ARGCHK((n != NULL) && (px != NULL) && (py != NULL), MP_BADARG);
-
- /* initialize precomputation table */
- MP_CHECKOK(mp_init(&tpx));
- MP_CHECKOK(mp_init(&tpy));;
- MP_CHECKOK(mp_init(&rz));
- MP_CHECKOK(mp_init(&raz4));
-
- for (i = 0; i < 16; i++) {
- MP_CHECKOK(mp_init(&precomp[i][0]));
- MP_CHECKOK(mp_init(&precomp[i][1]));
- }
- for (i = 0; i < MAX_SCRATCH; i++) {
- MP_CHECKOK(mp_init(&scratch[i]));
- }
-
- /* Set out[8] = P */
- MP_CHECKOK(mp_copy(px, &precomp[8][0]));
- MP_CHECKOK(mp_copy(py, &precomp[8][1]));
-
- /* Set (tpx, tpy) = 2P */
- MP_CHECKOK(group->
- point_dbl(&precomp[8][0], &precomp[8][1], &tpx, &tpy,
- group));
-
- /* Set 3P, 5P, ..., 15P */
- for (i = 8; i < 15; i++) {
- MP_CHECKOK(group->
- point_add(&precomp[i][0], &precomp[i][1], &tpx, &tpy,
- &precomp[i + 1][0], &precomp[i + 1][1],
- group));
- }
-
- /* Set -15P, -13P, ..., -P */
- for (i = 0; i < 8; i++) {
- MP_CHECKOK(mp_copy(&precomp[15 - i][0], &precomp[i][0]));
- MP_CHECKOK(group->meth->
- field_neg(&precomp[15 - i][1], &precomp[i][1],
- group->meth));
- }
-
- /* R = inf */
- MP_CHECKOK(ec_GFp_pt_set_inf_jac(rx, ry, &rz));
-
- orderBitSize = mpl_significant_bits(&group->order);
-
- /* Allocate memory for NAF */
- naf = (signed char *) malloc(sizeof(signed char) * (orderBitSize + 1));
- if (naf == NULL) {
- res = MP_MEM;
- goto CLEANUP;
- }
-
- /* Compute 5NAF */
- ec_compute_wNAF(naf, orderBitSize, n, 5);
-
- /* wNAF method */
- for (i = orderBitSize; i >= 0; i--) {
- /* R = 2R */
- ec_GFp_pt_dbl_jm(rx, ry, &rz, &raz4, rx, ry, &rz,
- &raz4, scratch, group);
- if (naf[i] != 0) {
- ec_GFp_pt_add_jm_aff(rx, ry, &rz, &raz4,
- &precomp[(naf[i] + 15) / 2][0],
- &precomp[(naf[i] + 15) / 2][1], rx, ry,
- &rz, &raz4, scratch, group);
- }
- }
-
- /* convert result S to affine coordinates */
- MP_CHECKOK(ec_GFp_pt_jac2aff(rx, ry, &rz, rx, ry, group));
-
- CLEANUP:
- for (i = 0; i < MAX_SCRATCH; i++) {
- mp_clear(&scratch[i]);
- }
- for (i = 0; i < 16; i++) {
- mp_clear(&precomp[i][0]);
- mp_clear(&precomp[i][1]);
- }
- mp_clear(&tpx);
- mp_clear(&tpy);
- mp_clear(&rz);
- mp_clear(&raz4);
- free(naf);
- return res;
-}
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