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