97 lines
3.6 KiB
C
97 lines
3.6 KiB
C
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/* Copyright (c) 2018, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#include <openssl/ec.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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#include "internal.h"
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#include "../bn/internal.h"
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#include "../../internal.h"
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int ec_bignum_to_scalar(const EC_GROUP *group, EC_SCALAR *out,
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const BIGNUM *in) {
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if (!bn_copy_words(out->words, group->order.width, in) ||
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!bn_less_than_words(out->words, group->order.d, group->order.width)) {
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OPENSSL_PUT_ERROR(EC, EC_R_INVALID_SCALAR);
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return 0;
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}
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return 1;
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}
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int ec_scalar_equal_vartime(const EC_GROUP *group, const EC_SCALAR *a,
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const EC_SCALAR *b) {
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return OPENSSL_memcmp(a->words, b->words,
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group->order.width * sizeof(BN_ULONG)) == 0;
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}
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int ec_scalar_is_zero(const EC_GROUP *group, const EC_SCALAR *a) {
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BN_ULONG mask = 0;
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for (int i = 0; i < group->order.width; i++) {
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mask |= a->words[i];
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}
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return mask == 0;
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}
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int ec_random_nonzero_scalar(const EC_GROUP *group, EC_SCALAR *out,
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const uint8_t additional_data[32]) {
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return bn_rand_range_words(out->words, 1, group->order.d, group->order.width,
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additional_data);
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}
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void ec_scalar_add(const EC_GROUP *group, EC_SCALAR *r, const EC_SCALAR *a,
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const EC_SCALAR *b) {
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const BIGNUM *order = &group->order;
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BN_ULONG tmp[EC_MAX_WORDS];
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bn_mod_add_words(r->words, a->words, b->words, order->d, tmp, order->width);
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OPENSSL_cleanse(tmp, sizeof(tmp));
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}
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void ec_scalar_to_montgomery(const EC_GROUP *group, EC_SCALAR *r,
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const EC_SCALAR *a) {
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const BIGNUM *order = &group->order;
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bn_to_montgomery_small(r->words, a->words, order->width, group->order_mont);
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}
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void ec_scalar_from_montgomery(const EC_GROUP *group, EC_SCALAR *r,
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const EC_SCALAR *a) {
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const BIGNUM *order = &group->order;
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bn_from_montgomery_small(r->words, a->words, order->width, group->order_mont);
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}
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void ec_scalar_mul_montgomery(const EC_GROUP *group, EC_SCALAR *r,
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const EC_SCALAR *a, const EC_SCALAR *b) {
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const BIGNUM *order = &group->order;
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bn_mod_mul_montgomery_small(r->words, a->words, b->words, order->width,
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group->order_mont);
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}
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void ec_simple_scalar_inv_montgomery(const EC_GROUP *group, EC_SCALAR *r,
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const EC_SCALAR *a) {
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const BIGNUM *order = &group->order;
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bn_mod_inverse_prime_mont_small(r->words, a->words, order->width,
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group->order_mont);
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}
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void ec_scalar_inv_montgomery(const EC_GROUP *group, EC_SCALAR *r,
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const EC_SCALAR *a) {
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group->meth->scalar_inv_montgomery(group, r, a);
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}
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int ec_scalar_inv_montgomery_vartime(const EC_GROUP *group, EC_SCALAR *r,
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const EC_SCALAR *a) {
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return group->meth->scalar_inv_montgomery_vartime(group, r, a);
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}
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