UDP.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 "UDP.h"
using namespace std;
using namespace dev;
using namespace dev::p2p;

const char* RLPXWarn::name() { return "!X!"; }
const char* RLPXNote::name() { return "-X-"; }

h256 RLPXDatagramFace::sign(Secret const& _k)
{
        assert(packetType());
        
        RLPStream rlpxstream;
//      rlpxstream.appendRaw(toPublic(_k).asBytes()); // for mdc-based signature
        rlpxstream.appendRaw(bytes(1, packetType())); // prefix by 1 byte for type
        streamRLP(rlpxstream);
        bytes rlpxBytes(rlpxstream.out());
        
        bytesConstRef rlpx(&rlpxBytes);
        h256 sighash(dev::sha3(rlpx)); // H(type||data)
        Signature sig = dev::sign(_k, sighash); // S(H(type||data))
        
        data.resize(h256::size + Signature::size + rlpx.size());
        bytesRef rlpxHash(&data[0], h256::size);
        bytesRef rlpxSig(&data[h256::size], Signature::size);
        bytesRef rlpxPayload(&data[h256::size + Signature::size], rlpx.size());
        
        sig.ref().copyTo(rlpxSig);
        rlpx.copyTo(rlpxPayload);
        
        bytesConstRef signedRLPx(&data[h256::size], data.size() - h256::size);
        dev::sha3(signedRLPx).ref().copyTo(rlpxHash);

        return sighash;
}

Public RLPXDatagramFace::authenticate(bytesConstRef _sig, bytesConstRef _rlp)
{
        Signature const& sig = *(Signature const*)_sig.data();
        return dev::recover(sig, sha3(_rlp));
}