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