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95 lines
2.4 KiB
95 lines
2.4 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file Precompiled.cpp
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#include "Precompiled.h"
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#include <libdevcrypto/SHA3.h>
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#include <libdevcrypto/Common.h>
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#include <libethcore/Common.h>
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#include <libevmcore/Params.h>
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using namespace std;
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using namespace dev;
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using namespace dev::eth;
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static bytes ecrecoverCode(bytesConstRef _in)
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{
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struct inType
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{
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h256 hash;
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h256 v;
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h256 r;
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h256 s;
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} in;
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memcpy(&in, _in.data(), min(_in.size(), sizeof(in)));
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h256 ret;
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if ((u256)in.v > 28)
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return ret.asBytes();
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SignatureStruct sig(in.r, in.s, (byte)((int)(u256)in.v - 27));
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if (!sig.isValid())
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return ret.asBytes();
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try
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{
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ret = dev::sha3(recover(sig, in.hash));
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}
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catch (...) {}
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memset(ret.data(), 0, 12);
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return ret.asBytes();
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}
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static bytes sha256Code(bytesConstRef _in)
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{
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bytes ret(32);
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sha256(_in, &ret);
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return ret;
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}
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static bytes ripemd160Code(bytesConstRef _in)
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{
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bytes ret(32);
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ripemd160(_in, &ret);
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// leaves the 20-byte hash left-aligned. we want it right-aligned:
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memmove(ret.data() + 12, ret.data(), 20);
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memset(ret.data(), 0, 12);
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return ret;
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}
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static bytes identityCode(bytesConstRef _in)
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{
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return _in.toBytes();
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}
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static const std::map<unsigned, PrecompiledAddress> c_precompiled =
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{
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{ 1, { [](bytesConstRef) -> bigint { return c_ecrecoverGas; }, ecrecoverCode }},
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{ 2, { [](bytesConstRef i) -> bigint { return c_sha256Gas + (i.size() + 31) / 32 * c_sha256WordGas; }, sha256Code }},
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{ 3, { [](bytesConstRef i) -> bigint { return c_ripemd160Gas + (i.size() + 31) / 32 * c_ripemd160WordGas; }, ripemd160Code }},
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{ 4, { [](bytesConstRef i) -> bigint { return c_identityGas + (i.size() + 31) / 32 * c_identityWordGas; }, identityCode }}
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};
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std::map<unsigned, PrecompiledAddress> const& dev::eth::precompiled()
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{
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return c_precompiled;
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}
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