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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/>.
*/
/** @file UDP.cpp
* @author Alex Leverington <nessence@gmail.com>
* @date 2014
*/
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#include "UDP.h"
using namespace dev;
using namespace dev::p2p;
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());
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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 std::move(sighash);
};
Public RLPXDatagramFace::authenticate(bytesConstRef _sig, bytesConstRef _rlp)
{
Signature const& sig = *(Signature const*)_sig.data();
return std::move(dev::recover(sig, sha3(_rlp)));
};