gen_multisig: generates multisig wallets if participants trust each other

1 files changed, 213 insertions, 0 deletions

diff --git a/src/gen_multisig/gen_multisig.cpp b/src/gen_multisig/gen_multisig.cpp
new file mode 100644
index 000000000..358c1e4c0
--- /dev/null
+++ b/src/gen_multisig/gen_multisig.cpp
@@ -0,0 +1,213 @@
+// Copyright (c) 2017, 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
+
+/*!
+ * \file gen_multisig.cpp
+ * 
+ * \brief Generates a set of multisig wallets
+ */
+#include <iostream>
+#include <sstream>
+#include <boost/program_options.hpp>
+#include <boost/algorithm/string.hpp>
+#include <boost/format.hpp>
+#include "include_base_utils.h"
+#include "crypto/crypto.h"  // for crypto::secret_key definition
+#include "common/i18n.h"
+#include "common/command_line.h"
+#include "common/util.h"
+#include "common/scoped_message_writer.h"
+#include "wallet/wallet_args.h"
+#include "wallet/wallet2.h"
+
+using namespace std;
+using namespace epee;
+using namespace cryptonote;
+using boost::lexical_cast;
+namespace po = boost::program_options;
+
+#undef MONERO_DEFAULT_LOG_CATEGORY
+#define MONERO_DEFAULT_LOG_CATEGORY "wallet.gen_multisig"
+
+namespace genms
+{
+  const char* tr(const char* str)
+  {
+    return i18n_translate(str, "tools::gen_multisig");
+  }
+
+}
+
+namespace
+{
+  const command_line::arg_descriptor<std::string> arg_filename_base = {"filename-base", genms::tr("Base filename (-1, -2, etc suffixes will be appended as needed)"), ""};
+  const command_line::arg_descriptor<std::string> arg_scheme = {"scheme", genms::tr("Give threshold and participants at once as M/N"), ""};
+  const command_line::arg_descriptor<uint32_t> arg_participants = {"participants", genms::tr("How many participants wil share parts of the multisig wallet"), 0};
+  const command_line::arg_descriptor<uint32_t> arg_threshold = {"threshold", genms::tr("How many signers are required to sign a valid transaction"), 0};
+  const command_line::arg_descriptor<bool, false> arg_testnet = {"testnet", genms::tr("Create testnet multisig wallets"), false};
+
+  const command_line::arg_descriptor< std::vector<std::string> > arg_command = {"command", ""};
+}
+
+static bool generate_multisig(uint32_t threshold, uint32_t total, const std::string &basename, bool testnet)
+{
+  tools::msg_writer() << (boost::format(genms::tr("Generating %u %u/%u multisig wallets")) % total % threshold % total).str();
+
+  const auto pwd_container = tools::password_container::prompt(true, "Enter password for new multisig wallets");
+
+  try
+  {
+    // create M wallets first
+    std::vector<boost::shared_ptr<tools::wallet2>> wallets(total);
+    for (size_t n = 0; n < total; ++n)
+    {
+      std::string name = basename + "-" + std::to_string(n + 1);
+      wallets[n].reset(new tools::wallet2(testnet));
+      wallets[n]->init("");
+      wallets[n]->generate(name, pwd_container->password(), rct::rct2sk(rct::skGen()), false, false);
+    }
+
+    // gather the keys
+    std::vector<crypto::secret_key> sk(total);
+    std::vector<crypto::public_key> pk(total);
+    for (size_t n = 0; n < total; ++n)
+    {
+      tools::wallet2::verify_multisig_info(wallets[n]->get_multisig_info(), sk[n], pk[n]);
+    }
+
+    // make the wallets multisig
+    std::stringstream ss;
+    for (size_t n = 0; n < total; ++n)
+    {
+      std::string name = basename + "-" + std::to_string(n + 1);
+      std::vector<crypto::secret_key> skn;
+      std::vector<crypto::public_key> pkn;
+      for (size_t k = 0; k < total; ++k)
+      {
+        if (k != n)
+        {
+          skn.push_back(sk[k]);
+          pkn.push_back(pk[k]);
+        }
+      }
+      wallets[n]->make_multisig(pwd_container->password(), skn, pkn, threshold);
+      ss << "  " << name << std::endl;
+    }
+
+    std::string address = wallets[0]->get_account().get_public_address_str(wallets[0]->testnet());
+    tools::success_msg_writer() << genms::tr("Generated multisig wallets for address ") << address << std::endl << ss.str();
+  }
+  catch (const std::exception &e)
+  {
+    tools::fail_msg_writer() << genms::tr("Error creating multisig wallets: ") << e.what();
+    return false;
+  }
+
+  return true;
+}
+
+int main(int argc, char* argv[])
+{
+  po::options_description desc_params(wallet_args::tr("Wallet options"));
+  command_line::add_arg(desc_params, arg_filename_base);
+  command_line::add_arg(desc_params, arg_scheme);
+  command_line::add_arg(desc_params, arg_threshold);
+  command_line::add_arg(desc_params, arg_participants);
+  command_line::add_arg(desc_params, arg_testnet);
+
+  const auto vm = wallet_args::main(
+   argc, argv,
+   "monero-gen-multisig [--testnet] [--filename-base=<filename>] [--scheme=M/N] [--threshold=M] [--participants=N]",
+    genms::tr("This program generates a set of multisig wallets - use this simpler scheme only if all the participants trust each other"),
+    desc_params,
+    boost::program_options::positional_options_description(),
+    [](const std::string &s, bool emphasis){ tools::scoped_message_writer(emphasis ? epee::console_color_white : epee::console_color_default, true) << s; },
+    "monero-gen-multisig.log"
+  );
+  if (!vm)
+    return 1;
+
+  bool testnet;
+  uint32_t threshold = 0, total = 0;
+  std::string basename;
+
+  testnet = command_line::get_arg(*vm, arg_testnet);
+  if (command_line::has_arg(*vm, arg_scheme))
+  {
+    if (sscanf(command_line::get_arg(*vm, arg_scheme).c_str(), "%u/%u", &threshold, &total) != 2)
+    {
+      tools::fail_msg_writer() << genms::tr("Error: expected N/M, but got: ") << command_line::get_arg(*vm, arg_scheme);
+      return 1;
+    }
+  }
+  if (!(*vm)["threshold"].defaulted())
+  {
+    if (threshold)
+    {
+      tools::fail_msg_writer() << genms::tr("Error: either --scheme or both of --threshold and --participants may be given");
+      return 1;
+    }
+    threshold = command_line::get_arg(*vm, arg_threshold);
+  }
+  if (!(*vm)["participants"].defaulted())
+  {
+    if (total)
+    {
+      tools::fail_msg_writer() << genms::tr("Error: either --scheme or both of --threshold and --participants may be given");
+      return 1;
+    }
+    total = command_line::get_arg(*vm, arg_participants);
+  }
+  if (threshold <= 1 || threshold > total)
+  {
+    tools::fail_msg_writer() << (boost::format(genms::tr("Error: expected N > 1 and N <= M, but got N==%u and M==%d")) % threshold % total).str();
+    return 1;
+  }
+  if (!(*vm)["filename-base"].defaulted() && !command_line::get_arg(*vm, arg_filename_base).empty())
+  {
+    basename = command_line::get_arg(*vm, arg_filename_base);
+  }
+  else
+  {
+    tools::fail_msg_writer() << genms::tr("Error: --filename-base is required");
+    return 1;
+  }
+
+  if (threshold != total-1 && threshold != total)
+  {
+    tools::fail_msg_writer() << genms::tr("Error: unsupported scheme: only N/N and N-1/N are supported");
+    return 1;
+  }
+  if (!generate_multisig(threshold, total, basename, testnet))
+    return 1;
+
+  return 0;
+  //CATCH_ENTRY_L0("main", 1);
+}