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[BUGFIX] LWMA-2 Tweaks, move difficulty to separate file, remove type…
…def (#448) * Make chacha8_key trivially copyable * LWMA-2 Tweaks, move difficulty to separate file, remove typedef * [BUGFIX] Scan height typo (#449) * Make chacha8_key trivially copyable * Fix typo in the wallet service configuration * Update version.h.in * We need <algorithm> for min/max in Windows * Remove un-needed difficulty algorithm
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| // Copyright (c) 2012-2017, The CryptoNote developers, The Bytecoin developers | ||
| // | ||
| // This file is part of Bytecoin. | ||
| // | ||
| // Bytecoin is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Lesser General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // Bytecoin is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public License | ||
| // along with Bytecoin. If not, see <http://www.gnu.org/licenses/>. | ||
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| #include <algorithm> | ||
| #include <cassert> | ||
| #include <cstddef> | ||
| #include <cstdint> | ||
| #include <vector> | ||
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| #include "Common/int-util.h" | ||
| #include "crypto/hash.h" | ||
| #include "CryptoNoteConfig.h" | ||
| #include "CheckDifficulty.h" | ||
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| namespace CryptoNote { | ||
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| using std::uint64_t; | ||
| using std::vector; | ||
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| #if defined(__SIZEOF_INT128__) | ||
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| static inline void mul(uint64_t a, uint64_t b, uint64_t &low, uint64_t &high) { | ||
| typedef unsigned __int128 uint128_t; | ||
| uint128_t res = (uint128_t) a * (uint128_t) b; | ||
| low = (uint64_t) res; | ||
| high = (uint64_t) (res >> 64); | ||
| } | ||
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| #else | ||
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| static inline void mul(uint64_t a, uint64_t b, uint64_t &low, uint64_t &high) { | ||
| low = mul128(a, b, &high); | ||
| } | ||
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| #endif | ||
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| static inline bool cadd(uint64_t a, uint64_t b) { | ||
| return a + b < a; | ||
| } | ||
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| static inline bool cadc(uint64_t a, uint64_t b, bool c) { | ||
| return a + b < a || (c && a + b == (uint64_t) -1); | ||
| } | ||
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| bool check_hash(const Crypto::Hash &hash, uint64_t difficulty) { | ||
| uint64_t low, high, top, cur; | ||
| // First check the highest word, this will most likely fail for a random hash. | ||
| mul(swap64le(((const uint64_t *) &hash)[3]), difficulty, top, high); | ||
| if (high != 0) { | ||
| return false; | ||
| } | ||
| mul(swap64le(((const uint64_t *) &hash)[0]), difficulty, low, cur); | ||
| mul(swap64le(((const uint64_t *) &hash)[1]), difficulty, low, high); | ||
| bool carry = cadd(cur, low); | ||
| cur = high; | ||
| mul(swap64le(((const uint64_t *) &hash)[2]), difficulty, low, high); | ||
| carry = cadc(cur, low, carry); | ||
| carry = cadc(high, top, carry); | ||
| return !carry; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| // Copyright (c) 2012-2017, The CryptoNote developers, The Bytecoin developers | ||
| // | ||
| // This file is part of Bytecoin. | ||
| // | ||
| // Bytecoin is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Lesser General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // Bytecoin is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public License | ||
| // along with Bytecoin. If not, see <http://www.gnu.org/licenses/>. | ||
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| #pragma once | ||
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| #include <cstdint> | ||
| #include <vector> | ||
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| #include "crypto/hash.h" | ||
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| namespace CryptoNote { | ||
| bool check_hash(const Crypto::Hash &hash, uint64_t difficulty); | ||
| } |
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