Precompiled.cpp

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/*
        This file is part of cpp-ethereum.

        cpp-ethereum is free software: you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation, either version 3 of the License, or
        (at your option) any later version.

        cpp-ethereum 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 General Public License for more details.

        You should have received a copy of the GNU General Public License
        along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "Precompiled.h"
#include <libdevcore/Log.h>
#include <libdevcore/SHA3.h>
#include <libdevcore/Hash.h>
#include <libdevcrypto/Common.h>
#include <libethcore/Common.h>
using namespace std;
using namespace dev;
using namespace dev::eth;

PrecompiledRegistrar* PrecompiledRegistrar::s_this = nullptr;

PrecompiledExecutor const& PrecompiledRegistrar::executor(std::string const& _name)
{
        if (!get()->m_execs.count(_name))
                BOOST_THROW_EXCEPTION(ExecutorNotFound());
        return get()->m_execs[_name];
}

namespace
{

ETH_REGISTER_PRECOMPILED(ecrecover)(bytesConstRef _in)
{
        struct
        {
                h256 hash;
                h256 v;
                h256 r;
                h256 s;
        } in;

        memcpy(&in, _in.data(), min(_in.size(), sizeof(in)));

        h256 ret;
        u256 v = (u256)in.v;
        if (v >= 27 && v <= 28)
        {
                SignatureStruct sig(in.r, in.s, (byte)((int)v - 27));
                if (sig.isValid())
                {
                        try
                        {
                                if (Public rec = recover(sig, in.hash))
                                {
                                        ret = dev::sha3(rec);
                                        memset(ret.data(), 0, 12);
                                        return {true, ret.asBytes()};
                                }
                        }
                        catch (...) {}
                }
        }
        return {true, {}};
}

ETH_REGISTER_PRECOMPILED(sha256)(bytesConstRef _in)
{
        return {true, dev::sha256(_in).asBytes()};
}

ETH_REGISTER_PRECOMPILED(ripemd160)(bytesConstRef _in)
{
        return {true, h256(dev::ripemd160(_in), h256::AlignRight).asBytes()};
}

ETH_REGISTER_PRECOMPILED(identity)(bytesConstRef _in)
{
        return {true, _in.toBytes()};
}

}