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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 Transaction.cpp
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#include <secp256k1.h>
#include "vector_ref.h"
#include "Exceptions.h"
#include "Transaction.h"
using namespace std;
using namespace eth;
#define ETH_ADDRESS_DEBUG 0
Transaction::Transaction(bytesConstRef _rlpData)
{
RLP rlp(_rlpData);
nonce = rlp[0].toInt<u256>();
receiveAddress = rlp[1].toHash<Address>();
value = rlp[2].toInt<u256>();
data.reserve(rlp[3].itemCountStrict());
for (auto const& i: rlp[3])
data.push_back(i.toInt<u256>());
vrs = Signature{ rlp[4].toInt<byte>(), rlp[5].toInt<u256>(), rlp[6].toInt<u256>() };
}
Address Transaction::safeSender() const noexcept
{
try
{
return sender();
}
catch (...)
{
return Address();
}
}
Address Transaction::sender() const
{
secp256k1_start();
h256 sig[2] = { vrs.r, vrs.s };
h256 msg = sha3(false);
byte pubkey[65];
int pubkeylen = 65;
if (!secp256k1_ecdsa_recover_compact(msg.data(), 32, sig[0].data(), pubkey, &pubkeylen, 0, (int)vrs.v - 27))
throw InvalidSignature();
// TODO: check right160 is correct and shouldn't be left160.
auto ret = right160(eth::sha3(bytesConstRef(&(pubkey[1]), 64)));
#if ETH_ADDRESS_DEBUG
cout << "---- RECOVER -------------------------------" << endl;
cout << "MSG: " << msg << endl;
cout << "R S V: " << sig[0] << " " << sig[1] << " " << (int)(vrs.v - 27) << "+27" << endl;
cout << "PUB: " << asHex(bytesConstRef(&(pubkey[1]), 64)) << endl;
cout << "ADR: " << ret << endl;
#endif
return ret;
}
void Transaction::sign(Secret _priv)
{
int v = 0;
secp256k1_start();
h256 msg = sha3(false);
h256 sig[2];
h256 nonce = kFromMessage(msg, _priv);
if (!secp256k1_ecdsa_sign_compact(msg.data(), 32, sig[0].data(), _priv.data(), nonce.data(), &v))
throw InvalidSignature();
#if ETH_ADDRESS_DEBUG
cout << "---- SIGN -------------------------------" << endl;
cout << "MSG: " << msg << endl;
cout << "SEC: " << _priv << endl;
cout << "NON: " << nonce << endl;
cout << "R S V: " << sig[0] << " " << sig[1] << " " << v << "+27" << endl;
#endif
vrs.v = (byte)(v + 27);
vrs.r = (u256)sig[0];
vrs.s = (u256)sig[1];
}
void Transaction::fillStream(RLPStream& _s, bool _sig) const
{
_s.appendList(_sig ? 7 : 4);
_s << nonce << receiveAddress << value << data;
if (_sig)
_s << vrs.v << vrs.r << vrs.s;
}
// If the h256 return is an integer, store it in bigendian (i.e. u256 ret; ... return (h256)ret; )
h256 Transaction::kFromMessage(h256 _msg, h256 _priv)
{
// TODO!
/*
v = '\x01' * 32
k = '\x00' * 32
priv = encode_privkey(priv,'bin')
msghash = encode(hash_to_int(msghash),256,32)
k = hmac.new(k, v+'\x00'+priv+msghash, hashlib.sha256).digest()
v = hmac.new(k, v, hashlib.sha256).digest()
k = hmac.new(k, v+'\x01'+priv+msghash, hashlib.sha256).digest()
v = hmac.new(k, v, hashlib.sha256).digest()
return decode(hmac.new(k, v, hashlib.sha256).digest(),256)
*/
return _msg ^ _priv;
}