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103 lines
3.9 KiB
C++
103 lines
3.9 KiB
C++
// Copyright (c) 2014-2023, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
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#include "crypto/crypto.cpp"
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#include "crypto-tests.h"
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static void get_ge_p3_for_identity_test(const crypto::public_key &point, crypto::ge_p3 &result_out_p3)
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{
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// compute (K + K) - K - K to get a specific ge_p3 point representation of identity
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crypto::ge_cached temp_cache;
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crypto::ge_p1p1 temp_p1p1;
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crypto::ge_frombytes_vartime(&result_out_p3, &point); // K
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crypto::ge_p3_to_cached(&temp_cache, &result_out_p3);
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crypto::ge_add(&temp_p1p1, &result_out_p3, &temp_cache); // K + K
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crypto::ge_p1p1_to_p3(&result_out_p3, &temp_p1p1);
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crypto::ge_sub(&temp_p1p1, &result_out_p3, &temp_cache); // (K + K) - K
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crypto::ge_p1p1_to_p3(&result_out_p3, &temp_p1p1);
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crypto::ge_sub(&temp_p1p1, &result_out_p3, &temp_cache); // ((K + K) - K) - K
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crypto::ge_p1p1_to_p3(&result_out_p3, &temp_p1p1);
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}
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static int ge_p3_is_point_at_infinity_vartime_bad(const crypto::ge_p3 *p) {
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// X = 0 and Y == Z
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// bad: components of 'p' are not reduced mod q
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int n;
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for (n = 0; n < 10; ++n)
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{
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if (p->X[n] | p->T[n])
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return 0;
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if (p->Y[n] != p->Z[n])
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return 0;
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}
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return 1;
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}
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bool check_scalar(const crypto::ec_scalar &scalar) {
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return crypto::sc_check(crypto::operator &(scalar)) == 0;
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}
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void random_scalar(crypto::ec_scalar &res) {
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crypto::random_scalar(res);
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}
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void hash_to_scalar(const void *data, std::size_t length, crypto::ec_scalar &res) {
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crypto::hash_to_scalar(data, length, res);
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}
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void hash_to_point(const crypto::hash &h, crypto::ec_point &res) {
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crypto::ge_p2 point;
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crypto::ge_fromfe_frombytes_vartime(&point, reinterpret_cast<const unsigned char *>(&h));
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crypto::ge_tobytes(crypto::operator &(res), &point);
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}
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void hash_to_ec(const crypto::public_key &key, crypto::ec_point &res) {
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crypto::ge_p3 tmp;
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crypto::hash_to_ec(key, tmp);
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crypto::ge_p3_tobytes(crypto::operator &(res), &tmp);
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}
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bool check_ge_p3_identity_failure(const crypto::public_key &point)
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{
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crypto::ge_p3 ident_p3;
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get_ge_p3_for_identity_test(point, ident_p3);
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return ge_p3_is_point_at_infinity_vartime_bad(&ident_p3) == 1;
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}
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bool check_ge_p3_identity_success(const crypto::public_key &point)
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{
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crypto::ge_p3 ident_p3;
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get_ge_p3_for_identity_test(point, ident_p3);
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return crypto::ge_p3_is_point_at_infinity_vartime(&ident_p3) == 1;
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}
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