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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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14
src/device/device_default.cpp
View File

@@ -263,6 +263,11 @@ namespace hw {
return true;
}
bool device_default::derive_view_tag(const crypto::key_derivation &derivation, const std::size_t output_index, crypto::view_tag &view_tag) {
crypto::derive_view_tag(derivation, output_index, view_tag);
return true;
}
bool device_default::conceal_derivation(crypto::key_derivation &derivation, const crypto::public_key &tx_pub_key, const std::vector<crypto::public_key> &additional_tx_pub_keys, const crypto::key_derivation &main_derivation, const std::vector<crypto::key_derivation> &additional_derivations){
return true;
}
@@ -291,7 +296,8 @@ namespace hw {
const cryptonote::tx_destination_entry &dst_entr, const boost::optional<cryptonote::account_public_address> &change_addr, const size_t output_index,
const bool &need_additional_txkeys, const std::vector<crypto::secret_key> &additional_tx_keys,
std::vector<crypto::public_key> &additional_tx_public_keys,
std::vector<rct::key> &amount_keys, crypto::public_key &out_eph_public_key) {
std::vector<rct::key> &amount_keys, crypto::public_key &out_eph_public_key,
const bool use_view_tags, crypto::view_tag &view_tag) {
crypto::key_derivation derivation;
@@ -331,6 +337,12 @@ namespace hw {
derivation_to_scalar(derivation, output_index, scalar1);
amount_keys.push_back(rct::sk2rct(scalar1));
}
if (use_view_tags)
{
derive_view_tag(derivation, output_index, view_tag);
}
r = derive_public_key(derivation, output_index, dst_entr.addr.m_spend_public_key, out_eph_public_key);
CHECK_AND_ASSERT_MES(r, false, "at creation outs: failed to derive_public_key(" << derivation << ", " << output_index << ", "<< dst_entr.addr.m_spend_public_key << ")");