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-rw-r--r--src/common/CMakeLists.txt6
-rw-r--r--src/common/combinator.cpp50
-rw-r--r--src/common/combinator.h96
-rw-r--r--src/wallet/wallet2.cpp77
-rw-r--r--src/wallet/wallet2.h4
5 files changed, 213 insertions, 20 deletions
diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index aed9bfee7..3045c003c 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -43,7 +43,8 @@ set(common_sources
spawn.cpp
threadpool.cpp
updates.cpp
- aligned.c)
+ aligned.c
+ combinator.cpp)
if (STACK_TRACE)
list(APPEND common_sources stack_trace.cpp)
@@ -77,7 +78,8 @@ set(common_private_headers
stack_trace.h
threadpool.h
updates.h
- aligned.h)
+ aligned.h
+ combinator.h)
monero_private_headers(common
${common_private_headers})
diff --git a/src/common/combinator.cpp b/src/common/combinator.cpp
new file mode 100644
index 000000000..cb4fbc908
--- /dev/null
+++ b/src/common/combinator.cpp
@@ -0,0 +1,50 @@
+// Copyright (c) 2018, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+// conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+// of conditions and the following disclaimer in the documentation and/or other
+// materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+// used to endorse or promote products derived from this software without specific
+// prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
+
+#include "combinator.h"
+
+namespace tools {
+
+uint64_t combinations_count(uint32_t k, uint32_t n)
+{
+ if (k > n) {
+ throw std::runtime_error("k must not be greater than n");
+ }
+
+ uint64_t c = 1;
+ for (uint64_t i = 1; i <= k; ++i) {
+ c *= n--;
+ c /= i;
+ }
+
+ return c;
+}
+
+}
diff --git a/src/common/combinator.h b/src/common/combinator.h
new file mode 100644
index 000000000..72c6800d5
--- /dev/null
+++ b/src/common/combinator.h
@@ -0,0 +1,96 @@
+// Copyright (c) 2018, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+// conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+// of conditions and the following disclaimer in the documentation and/or other
+// materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+// used to endorse or promote products derived from this software without specific
+// prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
+
+#pragma once
+
+#include <iostream>
+#include <vector>
+
+namespace tools {
+
+uint64_t combinations_count(uint32_t k, uint32_t n);
+
+template<typename T>
+class Combinator {
+public:
+ Combinator(const std::vector<T>& v) : origin(v) { }
+
+ std::vector<std::vector<T>> combine(size_t k);
+
+private:
+ void doCombine(size_t from, size_t k);
+
+ std::vector<T> origin;
+ std::vector<std::vector<T>> combinations;
+ std::vector<size_t> current;
+};
+
+template<typename T>
+std::vector<std::vector<T>> Combinator<T>::combine(size_t k)
+{
+ if (k > origin.size())
+ {
+ throw std::runtime_error("k must be smaller than elements number");
+ }
+
+ if (k == 0)
+ {
+ throw std::runtime_error("k must be greater than zero");
+ }
+
+ combinations.clear();
+ doCombine(0, k);
+ return combinations;
+}
+
+template<typename T>
+void Combinator<T>::doCombine(size_t from, size_t k)
+{
+ current.push_back(0);
+
+ for (size_t i = from; i <= origin.size() - k; ++i)
+ {
+ current.back() = i;
+
+ if (k > 1) {
+ doCombine(i + 1, k - 1);
+ } else {
+ std::vector<T> comb;
+ for (auto ind: current) {
+ comb.push_back(origin[ind]);
+ }
+ combinations.push_back(comb);
+ }
+ }
+
+ current.pop_back();
+}
+
+} //namespace tools
diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index 49aef4350..f21b074b6 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -67,6 +67,7 @@ using namespace epee;
#include "common/json_util.h"
#include "memwipe.h"
#include "common/base58.h"
+#include "common/combinator.h"
#include "common/dns_utils.h"
#include "common/notify.h"
#include "common/perf_timer.h"
@@ -177,6 +178,20 @@ namespace
return public_keys;
}
+
+ bool keys_intersect(const std::unordered_set<crypto::public_key>& s1, const std::unordered_set<crypto::public_key>& s2)
+ {
+ if (s1.empty() || s2.empty())
+ return false;
+
+ for (const auto& e: s1)
+ {
+ if (s2.find(e) != s2.end())
+ return true;
+ }
+
+ return false;
+ }
}
namespace
@@ -6045,7 +6060,7 @@ bool wallet2::sign_multisig_tx(multisig_tx_set &exported_txs, std::vector<crypto
for (auto &sig: ptx.multisig_sigs)
{
- if (sig.ignore != local_signer)
+ if (sig.ignore.find(local_signer) == sig.ignore.end())
{
ptx.tx.rct_signatures = sig.sigs;
@@ -6079,7 +6094,7 @@ bool wallet2::sign_multisig_tx(multisig_tx_set &exported_txs, std::vector<crypto
bool found = false;
for (const auto &sig: ptx.multisig_sigs)
{
- if (sig.ignore != local_signer && exported_txs.m_signers.find(sig.ignore) == exported_txs.m_signers.end())
+ if (sig.ignore.find(local_signer) == sig.ignore.end() && !keys_intersect(sig.ignore, exported_txs.m_signers))
{
THROW_WALLET_EXCEPTION_IF(found, error::wallet_internal_error, "More than one transaction is final");
ptx.tx.rct_signatures = sig.sigs;
@@ -7520,30 +7535,56 @@ void wallet2::transfer_selected_rct(std::vector<cryptonote::tx_destination_entry
// if this is a multisig wallet, create a list of multisig signers we can use
std::deque<crypto::public_key> multisig_signers;
size_t n_multisig_txes = 0;
+ std::vector<std::unordered_set<crypto::public_key>> ignore_sets;
if (m_multisig && !m_transfers.empty())
{
const crypto::public_key local_signer = get_multisig_signer_public_key();
size_t n_available_signers = 1;
+
+ // At this step we need to define set of participants available for signature,
+ // i.e. those of them who exchanged with multisig info's
for (const crypto::public_key &signer: m_multisig_signers)
{
if (signer == local_signer)
continue;
- multisig_signers.push_front(signer);
for (const auto &i: m_transfers[0].m_multisig_info)
{
if (i.m_signer == signer)
{
- multisig_signers.pop_front();
multisig_signers.push_back(signer);
++n_available_signers;
break;
}
}
}
- multisig_signers.push_back(local_signer);
+ // n_available_signers includes the transaction creator, but multisig_signers doesn't
MDEBUG("We can use " << n_available_signers << "/" << m_multisig_signers.size() << " other signers");
- THROW_WALLET_EXCEPTION_IF(n_available_signers+1 < m_multisig_threshold, error::multisig_import_needed);
- n_multisig_txes = n_available_signers == m_multisig_signers.size() ? m_multisig_threshold : 1;
+ THROW_WALLET_EXCEPTION_IF(n_available_signers < m_multisig_threshold, error::multisig_import_needed);
+ if (n_available_signers > m_multisig_threshold)
+ {
+ // If there more potential signers (those who exchanged with multisig info)
+ // than threshold needed some of them should be skipped since we don't know
+ // who will sign tx and who won't. Hence we don't contribute their LR pairs to the signature.
+
+ // We create as many transactions as many combinations of excluded signers may be.
+ // For example, if we have 2/4 wallet and wallets are: A, B, C and D. Let A be
+ // transaction creator, so we need just 1 signature from set of B, C, D.
+ // Using "excluding" logic here we have to exclude 2-of-3 wallets. Combinations go as follows:
+ // BC, BD, and CD. We save these sets to use later and counting the number of required txs.
+ tools::Combinator<crypto::public_key> c(std::vector<crypto::public_key>(multisig_signers.begin(), multisig_signers.end()));
+ auto ignore_combinations = c.combine(multisig_signers.size() + 1 - m_multisig_threshold);
+ for (const auto& combination: ignore_combinations)
+ {
+ ignore_sets.push_back(std::unordered_set<crypto::public_key>(combination.begin(), combination.end()));
+ }
+
+ n_multisig_txes = ignore_sets.size();
+ }
+ else
+ {
+ // If we have exact count of signers just to fit in threshold we don't exclude anyone and create 1 transaction
+ n_multisig_txes = 1;
+ }
MDEBUG("We will create " << n_multisig_txes << " txes");
}
@@ -7611,8 +7652,8 @@ void wallet2::transfer_selected_rct(std::vector<cryptonote::tx_destination_entry
src.mask = td.m_mask;
if (m_multisig)
{
- crypto::public_key ignore = m_multisig_threshold == m_multisig_signers.size() ? crypto::null_pkey : multisig_signers.front();
- src.multisig_kLRki = get_multisig_composite_kLRki(idx, ignore, used_L, used_L);
+ auto ignore_set = ignore_sets.empty() ? std::unordered_set<crypto::public_key>() : ignore_sets.front();
+ src.multisig_kLRki = get_multisig_composite_kLRki(idx, ignore_set, used_L, used_L);
}
else
src.multisig_kLRki = rct::multisig_kLRki({rct::zero(), rct::zero(), rct::zero(), rct::zero()});
@@ -7674,7 +7715,7 @@ void wallet2::transfer_selected_rct(std::vector<cryptonote::tx_destination_entry
std::vector<tools::wallet2::multisig_sig> multisig_sigs;
if (m_multisig)
{
- crypto::public_key ignore = m_multisig_threshold == m_multisig_signers.size() ? crypto::null_pkey : multisig_signers.front();
+ auto ignore = ignore_sets.empty() ? std::unordered_set<crypto::public_key>() : ignore_sets.front();
multisig_sigs.push_back({tx.rct_signatures, ignore, used_L, std::unordered_set<crypto::public_key>(), msout});
if (m_multisig_threshold < m_multisig_signers.size())
@@ -7682,7 +7723,7 @@ void wallet2::transfer_selected_rct(std::vector<cryptonote::tx_destination_entry
const crypto::hash prefix_hash = cryptonote::get_transaction_prefix_hash(tx);
// create the other versions, one for every other participant (the first one's already done above)
- for (size_t signer_index = 1; signer_index < n_multisig_txes; ++signer_index)
+ for (size_t ignore_index = 1; ignore_index < ignore_sets.size(); ++ignore_index)
{
std::unordered_set<rct::key> new_used_L;
size_t src_idx = 0;
@@ -7690,7 +7731,7 @@ void wallet2::transfer_selected_rct(std::vector<cryptonote::tx_destination_entry
for(size_t idx: selected_transfers)
{
cryptonote::tx_source_entry& src = sources_copy[src_idx];
- src.multisig_kLRki = get_multisig_composite_kLRki(idx, multisig_signers[signer_index], used_L, new_used_L);
+ src.multisig_kLRki = get_multisig_composite_kLRki(idx, ignore_sets[ignore_index], used_L, new_used_L);
++src_idx;
}
@@ -7702,7 +7743,7 @@ void wallet2::transfer_selected_rct(std::vector<cryptonote::tx_destination_entry
THROW_WALLET_EXCEPTION_IF(!r, error::tx_not_constructed, sources, splitted_dsts, unlock_time, m_nettype);
THROW_WALLET_EXCEPTION_IF(upper_transaction_weight_limit <= get_transaction_weight(tx), error::tx_too_big, tx, upper_transaction_weight_limit);
THROW_WALLET_EXCEPTION_IF(cryptonote::get_transaction_prefix_hash(ms_tx) != prefix_hash, error::wallet_internal_error, "Multisig txes do not share prefix");
- multisig_sigs.push_back({ms_tx.rct_signatures, multisig_signers[signer_index], new_used_L, std::unordered_set<crypto::public_key>(), msout});
+ multisig_sigs.push_back({ms_tx.rct_signatures, ignore_sets[ignore_index], new_used_L, std::unordered_set<crypto::public_key>(), msout});
ms_tx.rct_signatures = tx.rct_signatures;
THROW_WALLET_EXCEPTION_IF(cryptonote::get_transaction_hash(ms_tx) != cryptonote::get_transaction_hash(tx), error::wallet_internal_error, "Multisig txes differ by more than the signatures");
@@ -11273,7 +11314,7 @@ rct::multisig_kLRki wallet2::get_multisig_kLRki(size_t n, const rct::key &k) con
return kLRki;
}
//----------------------------------------------------------------------------------------------------
-rct::multisig_kLRki wallet2::get_multisig_composite_kLRki(size_t n, const crypto::public_key &ignore, std::unordered_set<rct::key> &used_L, std::unordered_set<rct::key> &new_used_L) const
+rct::multisig_kLRki wallet2::get_multisig_composite_kLRki(size_t n, const std::unordered_set<crypto::public_key> &ignore_set, std::unordered_set<rct::key> &used_L, std::unordered_set<rct::key> &new_used_L) const
{
CHECK_AND_ASSERT_THROW_MES(n < m_transfers.size(), "Bad transfer index");
@@ -11284,8 +11325,9 @@ rct::multisig_kLRki wallet2::get_multisig_composite_kLRki(size_t n, const crypto
size_t n_signers_used = 1;
for (const auto &p: m_transfers[n].m_multisig_info)
{
- if (p.m_signer == ignore)
+ if (ignore_set.find(p.m_signer) != ignore_set.end())
continue;
+
for (const auto &lr: p.m_LR)
{
if (used_L.find(lr.m_L) != used_L.end())
@@ -11344,7 +11386,10 @@ cryptonote::blobdata wallet2::export_multisig()
info[n].m_partial_key_images.push_back(ki);
}
- size_t nlr = m_multisig_threshold < m_multisig_signers.size() ? m_multisig_threshold - 1 : 1;
+ // Wallet tries to create as many transactions as many signers combinations. We calculate the maximum number here as follows:
+ // if we have 2/4 wallet with signers: A, B, C, D and A is a transaction creator it will need to pick up 1 signer from 3 wallets left.
+ // That means counting combinations for excluding 2-of-3 wallets (k = total signers count - threshold, n = total signers count - 1).
+ size_t nlr = tools::combinations_count(m_multisig_signers.size() - m_multisig_threshold, m_multisig_signers.size() - 1);
for (size_t m = 0; m < nlr; ++m)
{
td.m_multisig_k.push_back(rct::skGen());
diff --git a/src/wallet/wallet2.h b/src/wallet/wallet2.h
index eb0763131..99e060e4c 100644
--- a/src/wallet/wallet2.h
+++ b/src/wallet/wallet2.h
@@ -374,7 +374,7 @@ namespace tools
struct multisig_sig
{
rct::rctSig sigs;
- crypto::public_key ignore;
+ std::unordered_set<crypto::public_key> ignore;
std::unordered_set<rct::key> used_L;
std::unordered_set<crypto::public_key> signing_keys;
rct::multisig_out msout;
@@ -1256,7 +1256,7 @@ namespace tools
void scan_output(const cryptonote::transaction &tx, const crypto::public_key &tx_pub_key, size_t i, tx_scan_info_t &tx_scan_info, int &num_vouts_received, std::unordered_map<cryptonote::subaddress_index, uint64_t> &tx_money_got_in_outs, std::vector<size_t> &outs);
void trim_hashchain();
crypto::key_image get_multisig_composite_key_image(size_t n) const;
- rct::multisig_kLRki get_multisig_composite_kLRki(size_t n, const crypto::public_key &ignore, std::unordered_set<rct::key> &used_L, std::unordered_set<rct::key> &new_used_L) const;
+ rct::multisig_kLRki get_multisig_composite_kLRki(size_t n, const std::unordered_set<crypto::public_key> &ignore_set, std::unordered_set<rct::key> &used_L, std::unordered_set<rct::key> &new_used_L) const;
rct::multisig_kLRki get_multisig_kLRki(size_t n, const rct::key &k) const;
rct::key get_multisig_k(size_t idx, const std::unordered_set<rct::key> &used_L) const;
void update_multisig_rescan_info(const std::vector<std::vector<rct::key>> &multisig_k, const std::vector<std::vector<tools::wallet2::multisig_info>> &info, size_t n);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-18 16:29:55 +0000