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Add view tags to outputs to reduce wallet scanning time

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Implements view tags as proposed by @UkoeHB in MRL issue
https://github.com/monero-project/research-lab/issues/73

At tx construction, the sender adds a 1-byte view tag to each
output. The view tag is derived from the sender-receiver
shared secret. When scanning for outputs, the receiver can
check the view tag for a match, in order to reduce scanning
time. When the view tag does not match, the wallet avoids the
more expensive EC operations when deriving the output public
key using the shared secret.
This commit is contained in:
j-berman 2021-11-15 05:23:53 -08:00
parent 6694597974
commit ea87b30f89
39 changed files with 1165 additions and 230 deletions
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22
tests/core_tests/chaingen.cpp
View file

@ -462,7 +462,9 @@ bool init_output_indices(map_output_idx_t& outs, std::map<uint64_t, std::vector<
size_t tx_global_idx = outs[out.amount].size() - 1;
outs[out.amount][tx_global_idx].idx = tx_global_idx;
// Is out to me?
if (is_out_to_acc(from.get_keys(), boost::get<txout_to_key>(out.target), get_tx_pub_key_from_extra(tx), get_additional_tx_pub_keys_from_extra(tx), j)) {
crypto::public_key output_public_key;
cryptonote::get_output_public_key(out, output_public_key);
if (is_out_to_acc(from.get_keys(), output_public_key, get_tx_pub_key_from_extra(tx), get_additional_tx_pub_keys_from_extra(tx), j)) {
outs_mine[out.amount].push_back(tx_global_idx);
}
}
@ -972,7 +974,7 @@ std::vector<cryptonote::tx_destination_entry> build_dsts(std::initializer_list<d
bool construct_miner_tx_manually(size_t height, uint64_t already_generated_coins,
const account_public_address& miner_address, transaction& tx, uint64_t fee,
keypair* p_txkey/* = 0*/)
uint8_t hf_version/* = 1*/, keypair* p_txkey/* = 0*/)
{
keypair txkey;
txkey = keypair::generate(hw::get_device("default"));
@ -987,7 +989,7 @@ bool construct_miner_tx_manually(size_t height, uint64_t already_generated_coins
// This will work, until size of constructed block is less then CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE
uint64_t block_reward;
if (!get_block_reward(0, 0, already_generated_coins, block_reward, 1))
if (!get_block_reward(0, 0, already_generated_coins, block_reward, hf_version))
{
LOG_PRINT_L0("Block is too big");
return false;
@ -999,12 +1001,20 @@ bool construct_miner_tx_manually(size_t height, uint64_t already_generated_coins
crypto::generate_key_derivation(miner_address.m_view_public_key, txkey.sec, derivation);
crypto::derive_public_key(derivation, 0, miner_address.m_spend_public_key, out_eph_public_key);
bool use_view_tags = hf_version >= HF_VERSION_VIEW_TAGS;
crypto::view_tag view_tag;
if (use_view_tags)
crypto::derive_view_tag(derivation, 0, view_tag);
tx_out out;
out.amount = block_reward;
out.target = txout_to_key(out_eph_public_key);
cryptonote::set_tx_out(block_reward, out_eph_public_key, use_view_tags, view_tag, out);
tx.vout.push_back(out);
tx.version = 1;
if (hf_version >= HF_VERSION_DYNAMIC_FEE)
tx.version = 2;
else
tx.version = 1;
tx.unlock_time = height + CRYPTONOTE_MINED_MONEY_UNLOCK_WINDOW;
return true;