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rct: make the amount key derivable by a third party with the tx key

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Scheme design from luigi1114.
This commit is contained in:
moneromooo-monero 2016-07-24 17:53:34 +01:00
parent cf33e1a52a
commit 9b70856ccb
No known key found for this signature in database
GPG key ID: 686F07454D6CEFC3
12 changed files with 141 additions and 93 deletions
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47
src/wallet/wallet2.cpp
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@ -195,10 +195,18 @@ void wallet2::check_acc_out(const account_keys &acc, const tx_out &o, const cryp
//----------------------------------------------------------------------------------------------------
static uint64_t decodeRct(const rct::rctSig & rv, const rct::key & sk, unsigned int i, rct::key & mask)
{
if (rv.simple)
return rct::decodeRctSimple(rv, sk, i, mask);
else
return rct::decodeRct(rv, sk, i, mask);
try
{
if (rv.simple)
return rct::decodeRctSimpleFromSharedSecret(rv, sk, i, mask);
else
return rct::decodeRctFromSharedSecret(rv, sk, i, mask);
}
catch (const std::exception &e)
{
LOG_ERROR("Failed to decode input " << i);
return 0;
}
}
//----------------------------------------------------------------------------------------------------
void wallet2::process_new_transaction(const cryptonote::transaction& tx, const std::vector<uint64_t> &o_indices, uint64_t height, uint64_t ts, bool miner_tx, bool pool)
@ -260,7 +268,11 @@ void wallet2::process_new_transaction(const cryptonote::transaction& tx, const s
outs.push_back(0);
if (money_transfered == 0)
money_transfered = tools::decodeRct(tx.rct_signatures, rct::sk2rct(in_ephemeral[0].sec), 0, mask[0]);
{
const cryptonote::account_keys& keys = m_account.get_keys();
rct::key amount_key = rct::hash_to_scalar(rct::scalarmultKey(rct::pk2rct(pub_key_field.pub_key), rct::sk2rct(keys.m_view_secret_key)));
money_transfered = tools::decodeRct(tx.rct_signatures, amount_key, 0, mask[0]);
}
amount[0] = money_transfered;
tx_money_got_in_outs = money_transfered;
++num_vouts_received;
@ -300,7 +312,11 @@ void wallet2::process_new_transaction(const cryptonote::transaction& tx, const s
outs.push_back(i);
if (money_transfered[i] == 0)
money_transfered[i] = tools::decodeRct(tx.rct_signatures, rct::sk2rct(in_ephemeral[i].sec), i, mask[i]);
{
const cryptonote::account_keys& keys = m_account.get_keys();
rct::key amount_key = rct::hash_to_scalar(rct::scalarmultKey(rct::pk2rct(pub_key_field.pub_key), rct::sk2rct(keys.m_view_secret_key)));
money_transfered[i] = tools::decodeRct(tx.rct_signatures, amount_key, i, mask[i]);
}
tx_money_got_in_outs += money_transfered[i];
amount[i] = money_transfered[i];
++num_vouts_received;
@ -345,7 +361,11 @@ void wallet2::process_new_transaction(const cryptonote::transaction& tx, const s
outs.push_back(i);
if (money_transfered[i] == 0)
money_transfered[i] = tools::decodeRct(tx.rct_signatures, rct::sk2rct(in_ephemeral[i].sec), i, mask[i]);
{
const cryptonote::account_keys& keys = m_account.get_keys();
rct::key amount_key = rct::hash_to_scalar(rct::scalarmultKey(rct::pk2rct(pub_key_field.pub_key), rct::sk2rct(keys.m_view_secret_key)));
money_transfered[i] = tools::decodeRct(tx.rct_signatures, amount_key, i, mask[i]);
}
tx_money_got_in_outs += money_transfered[i];
amount[i] = money_transfered[i];
++num_vouts_received;
@ -374,7 +394,11 @@ void wallet2::process_new_transaction(const cryptonote::transaction& tx, const s
outs.push_back(i);
if (money_transfered == 0)
money_transfered = tools::decodeRct(tx.rct_signatures, rct::sk2rct(in_ephemeral[i].sec), i, mask[i]);
{
const cryptonote::account_keys& keys = m_account.get_keys();
rct::key amount_key = rct::hash_to_scalar(rct::scalarmultKey(rct::pk2rct(pub_key_field.pub_key), rct::sk2rct(keys.m_view_secret_key)));
money_transfered = tools::decodeRct(tx.rct_signatures, amount_key, i, mask[i]);
}
amount[i] = money_transfered;
tx_money_got_in_outs += money_transfered;
++num_vouts_received;
@ -1270,7 +1294,6 @@ bool wallet2::clear()
m_unconfirmed_txs.clear();
m_payments.clear();
m_tx_keys.clear();
m_amount_keys.clear();
m_confirmed_txs.clear();
m_local_bc_height = 1;
return true;
@ -2429,7 +2452,6 @@ void wallet2::commit_tx(pending_tx& ptx)
if (store_tx_info())
{
m_tx_keys.insert(std::make_pair(txid, ptx.tx_key));
m_amount_keys.insert(std::make_pair(txid, ptx.amount_keys));
}
LOG_PRINT_L2("transaction " << txid << " generated ok and sent to daemon, key_images: [" << ptx.key_images << "]");
@ -3974,15 +3996,12 @@ std::vector<wallet2::pending_tx> wallet2::create_unmixable_sweep_transactions(bo
}
}
bool wallet2::get_tx_keys(const crypto::hash &txid, crypto::secret_key &tx_key, std::vector<crypto::secret_key> &amount_keys) const
bool wallet2::get_tx_key(const crypto::hash &txid, crypto::secret_key &tx_key) const
{
const std::unordered_map<crypto::hash, crypto::secret_key>::const_iterator i = m_tx_keys.find(txid);
if (i == m_tx_keys.end())
return false;
tx_key = i->second;
const std::unordered_map<crypto::hash, std::vector<crypto::secret_key>>::const_iterator j = m_amount_keys.find(txid);
if (j != m_amount_keys.end())
amount_keys = j->second;
return true;
}