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49 lines
2 KiB
C++
49 lines
2 KiB
C++
// Copyright (c) 2022 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <bench/bench.h>
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#include <key.h>
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#include <pubkey.h>
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#include <random.h>
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#include <span.h>
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#include <array>
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#include <cstddef>
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static void BIP324_ECDH(benchmark::Bench& bench)
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{
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ECC_Context ecc_context{};
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FastRandomContext rng;
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std::array<std::byte, 32> key_data;
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std::array<std::byte, EllSwiftPubKey::size()> our_ellswift_data;
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std::array<std::byte, EllSwiftPubKey::size()> their_ellswift_data;
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rng.fillrand(key_data);
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rng.fillrand(our_ellswift_data);
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rng.fillrand(their_ellswift_data);
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bench.batch(1).unit("ecdh").run([&] {
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CKey key;
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key.Set(key_data.data(), key_data.data() + 32, true);
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EllSwiftPubKey our_ellswift(our_ellswift_data);
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EllSwiftPubKey their_ellswift(their_ellswift_data);
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auto ret = key.ComputeBIP324ECDHSecret(their_ellswift, our_ellswift, true);
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// To make sure that the computation is not the same on every iteration (ellswift decoding
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// is variable-time), distribute bytes from the shared secret over the 3 inputs. The most
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// important one is their_ellswift, because that one is actually decoded, so it's given most
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// bytes. The data is copied into the middle, so that both halves are affected:
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// - Copy 8 bytes from the resulting shared secret into middle of the private key.
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std::copy(ret.begin(), ret.begin() + 8, key_data.begin() + 12);
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// - Copy 8 bytes from the resulting shared secret into the middle of our ellswift key.
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std::copy(ret.begin() + 8, ret.begin() + 16, our_ellswift_data.begin() + 28);
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// - Copy 16 bytes from the resulting shared secret into the middle of their ellswift key.
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std::copy(ret.begin() + 16, ret.end(), their_ellswift_data.begin() + 24);
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});
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}
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BENCHMARK(BIP324_ECDH, benchmark::PriorityLevel::HIGH);
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