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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
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GPG key ID: 686F07454D6CEFC3
12 changed files with 141 additions and 93 deletions
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10
src/cryptonote_core/cryptonote_format_utils.cpp
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@ -681,6 +681,7 @@ namespace cryptonote
destinations.push_back(rct::pk2rct(boost::get<txout_to_key>(tx.vout[i].target).key));
outamounts.push_back(tx.vout[i].amount);
amount_out += tx.vout[i].amount;
amount_keys.push_back(rct::rct2sk(rct::hash_to_scalar(rct::scalarmultKey(rct::pk2rct(shuffled_dsts[i].addr.m_view_public_key), rct::sk2rct(txkey.sec)))));
}
if (use_simple_rct)
@ -724,16 +725,11 @@ namespace cryptonote
get_transaction_prefix_hash(tx, tx_prefix_hash);
rct::ctkeyV outSk;
if (use_simple_rct)
tx.rct_signatures = rct::genRctSimple(rct::hash2rct(tx_prefix_hash), inSk, destinations, inamounts, outamounts, amount_in - amount_out, mixRing, index, outSk);
tx.rct_signatures = rct::genRctSimple(rct::hash2rct(tx_prefix_hash), inSk, destinations, inamounts, outamounts, amount_in - amount_out, mixRing, (const rct::keyV&)amount_keys, index, outSk);
else
tx.rct_signatures = rct::genRct(rct::hash2rct(tx_prefix_hash), inSk, destinations, outamounts, mixRing, sources[0].real_output, outSk); // same index assumption
tx.rct_signatures = rct::genRct(rct::hash2rct(tx_prefix_hash), inSk, destinations, outamounts, mixRing, (const rct::keyV&)amount_keys, sources[0].real_output, outSk); // same index assumption
CHECK_AND_ASSERT_MES(tx.vout.size() == outSk.size(), false, "outSk size does not match vout");
for (size_t i = 0; i < tx.vout.size(); ++i)
{
amount_keys.push_back(rct::rct2sk(rct::d2h(shuffled_dsts[i].amount)));
amount_keys.push_back(rct::rct2sk(outSk[i].mask));
}
LOG_PRINT2("construct_tx.log", "transaction_created: " << get_transaction_hash(tx) << ENDL << obj_to_json_str(tx) << ENDL, LOG_LEVEL_3);
}