Arbitrary M/N multisig schemes:

* support in wallet2
* support in monero-wallet-cli
* support in monero-wallet-rpc
* support in wallet api
* support in monero-gen-trusted-multisig
* unit tests for multisig wallets creation

2 files changed, 76 insertions, 105 deletions

diff --git a/tests/core_tests/chaingen.h b/tests/core_tests/chaingen.h
index 34b205ae5..c9e1640aa 100644
--- a/tests/core_tests/chaingen.h
+++ b/tests/core_tests/chaingen.h
@@ -593,7 +593,7 @@ inline bool do_replay_file(const std::string& filename)
         std::vector<crypto::public_key> spend_public_keys; \
         for (const auto &k: all_multisig_keys) \
           spend_public_keys.push_back(k); \
-        crypto::public_key spend_pkey = cryptonote::generate_multisig_N1_N_spend_public_key(spend_public_keys); \
+        crypto::public_key spend_pkey = cryptonote::generate_multisig_M_N_spend_public_key(spend_public_keys); \
         for (size_t msidx = 0; msidx < total; ++msidx) \
           account[msidx].finalize_multisig(spend_pkey); \
       } \
diff --git a/tests/unit_tests/multisig.cpp b/tests/unit_tests/multisig.cpp
index 83924c7af..7268f2690 100644
--- a/tests/unit_tests/multisig.cpp
+++ b/tests/unit_tests/multisig.cpp
@@ -49,9 +49,19 @@ static const struct
   {
     "9t6Hn946u3eah5cuncH1hB5hGzsTUoevtf4SY7MHN5NgJZh2SFWsyVt3vUhuHyRKyrCQvr71Lfc1AevG3BXE11PQFoXDtD8",
     "bbd3175ef9fd9f5eefdc43035f882f74ad14c4cf1799d8b6f9001bc197175d02"
+  },
+  {
+    "9zmAWoNyNPbgnYSm3nJNpAKHm6fCcs3MR94gBWxp9MCDUiMUhyYFfyQETUDLPF7DP6ZsmNo6LRxwPP9VmhHNxKrER9oGigT",
+    "f2efae45bef1917a7430cda8fcffc4ee010e3178761aa41d4628e23b1fe2d501"
+  },
+  {
+    "9ue8NJMg3WzKxTtmjeXzWYF5KmU6dC7LHEt9wvYdPn2qMmoFUa8hJJHhSHvJ46UEwpDyy5jSboNMRaDBKwU54NT42YcNUp5",
+    "a4cef54ed3fd61cd78a2ceb82ecf85a903ad2db9a86fb77ff56c35c56016280a"
   }
 };
 
+static const size_t KEYS_COUNT = 5;
+
 static void make_wallet(unsigned int idx, tools::wallet2 &wallet)
 {
   ASSERT_TRUE(idx < sizeof(test_addresses) / sizeof(test_addresses[0]));
@@ -76,126 +86,87 @@ static void make_wallet(unsigned int idx, tools::wallet2 &wallet)
   }
 }
 
-static void make_M_2_wallet(tools::wallet2 &wallet0, tools::wallet2 &wallet1, unsigned int M)
+static std::vector<std::string> exchange_round(std::vector<tools::wallet2>& wallets, const std::vector<std::string>& mis)
 {
-  ASSERT_TRUE(M <= 2);
-
-  make_wallet(0, wallet0);
-  make_wallet(1, wallet1);
-
-  std::vector<crypto::secret_key> sk0(1), sk1(1);
-  std::vector<crypto::public_key> pk0(1), pk1(1);
-
-  wallet0.decrypt_keys("");
-  std::string mi0 = wallet0.get_multisig_info();
-  wallet0.encrypt_keys("");
-  wallet1.decrypt_keys("");
-  std::string mi1 = wallet1.get_multisig_info();
-  wallet1.encrypt_keys("");
-
-  ASSERT_TRUE(tools::wallet2::verify_multisig_info(mi1, sk0[0], pk0[0]));
-  ASSERT_TRUE(tools::wallet2::verify_multisig_info(mi0, sk1[0], pk1[0]));
-
-  ASSERT_FALSE(wallet0.multisig() || wallet1.multisig());
-  wallet0.make_multisig("", sk0, pk0, M);
-  wallet1.make_multisig("", sk1, pk1, M);
-
-  ASSERT_TRUE(wallet0.get_account().get_public_address_str(cryptonote::TESTNET) == wallet1.get_account().get_public_address_str(cryptonote::TESTNET));
-
-  bool ready;
-  uint32_t threshold, total;
-  ASSERT_TRUE(wallet0.multisig(&ready, &threshold, &total));
-  ASSERT_TRUE(ready);
-  ASSERT_TRUE(threshold == M);
-  ASSERT_TRUE(total == 2);
-  ASSERT_TRUE(wallet1.multisig(&ready, &threshold, &total));
-  ASSERT_TRUE(ready);
-  ASSERT_TRUE(threshold == M);
-  ASSERT_TRUE(total == 2);
+  std::vector<std::string> new_infos;
+  for (size_t i = 0; i < wallets.size(); ++i) {
+      new_infos.push_back(wallets[i].exchange_multisig_keys("", mis));
+  }
+
+  return new_infos;
 }
 
-static void make_M_3_wallet(tools::wallet2 &wallet0, tools::wallet2 &wallet1, tools::wallet2 &wallet2, unsigned int M)
+static void make_wallets(std::vector<tools::wallet2>& wallets, unsigned int M)
 {
-  ASSERT_TRUE(M <= 3);
-
-  make_wallet(0, wallet0);
-  make_wallet(1, wallet1);
-  make_wallet(2, wallet2);
-
-  std::vector<crypto::secret_key> sk0(2), sk1(2), sk2(2);
-  std::vector<crypto::public_key> pk0(2), pk1(2), pk2(2);
-
-  wallet0.decrypt_keys("");
-  std::string mi0 = wallet0.get_multisig_info();
-  wallet0.encrypt_keys("");
-  wallet1.decrypt_keys("");
-  std::string mi1 = wallet1.get_multisig_info();
-  wallet1.encrypt_keys("");
-  wallet2.decrypt_keys("");
-  std::string mi2 = wallet2.get_multisig_info();
-  wallet2.encrypt_keys("");
-
-  ASSERT_TRUE(tools::wallet2::verify_multisig_info(mi1, sk0[0], pk0[0]));
-  ASSERT_TRUE(tools::wallet2::verify_multisig_info(mi2, sk0[1], pk0[1]));
-  ASSERT_TRUE(tools::wallet2::verify_multisig_info(mi0, sk1[0], pk1[0]));
-  ASSERT_TRUE(tools::wallet2::verify_multisig_info(mi2, sk1[1], pk1[1]));
-  ASSERT_TRUE(tools::wallet2::verify_multisig_info(mi0, sk2[0], pk2[0]));
-  ASSERT_TRUE(tools::wallet2::verify_multisig_info(mi1, sk2[1], pk2[1]));
-
-  ASSERT_FALSE(wallet0.multisig() || wallet1.multisig() || wallet2.multisig());
-  std::string mxi0 = wallet0.make_multisig("", sk0, pk0, M);
-  std::string mxi1 = wallet1.make_multisig("", sk1, pk1, M);
-  std::string mxi2 = wallet2.make_multisig("", sk2, pk2, M);
-
-  const size_t nset = !mxi0.empty() + !mxi1.empty() + !mxi2.empty();
-  ASSERT_TRUE((M < 3 && nset == 3) || (M == 3 && nset == 0));
-
-  if (nset > 0)
-  {
-    std::unordered_set<crypto::public_key> pkeys;
-    std::vector<crypto::public_key> signers(3, crypto::null_pkey);
-    ASSERT_TRUE(tools::wallet2::verify_extra_multisig_info(mxi0, pkeys, signers[0]));
-    ASSERT_TRUE(tools::wallet2::verify_extra_multisig_info(mxi1, pkeys, signers[1]));
-    ASSERT_TRUE(tools::wallet2::verify_extra_multisig_info(mxi2, pkeys, signers[2]));
-    ASSERT_TRUE(pkeys.size() == 3);
-    ASSERT_TRUE(wallet0.finalize_multisig("", pkeys, signers));
-    ASSERT_TRUE(wallet1.finalize_multisig("", pkeys, signers));
-    ASSERT_TRUE(wallet2.finalize_multisig("", pkeys, signers));
+  ASSERT_TRUE(wallets.size() > 1 && wallets.size() <= KEYS_COUNT);
+  ASSERT_TRUE(M <= wallets.size());
+
+  std::vector<std::string> mis(wallets.size());
+
+  for (size_t i = 0; i < wallets.size(); ++i) {
+    make_wallet(i, wallets[i]);
+
+    wallets[i].decrypt_keys("");
+    mis[i] = wallets[i].get_multisig_info();
+    wallets[i].encrypt_keys("");
+  }
+
+  for (auto& wallet: wallets) {
+    ASSERT_FALSE(wallet.multisig() || wallet.multisig() || wallet.multisig());
+  }
+
+  std::vector<std::string> mxis;
+  for (size_t i = 0; i < wallets.size(); ++i) {
+    // it's ok to put all of multisig keys in this function. it throws in case of error
+    mxis.push_back(wallets[i].make_multisig("", mis, M));
   }
 
-  ASSERT_TRUE(wallet0.get_account().get_public_address_str(cryptonote::TESTNET) == wallet1.get_account().get_public_address_str(cryptonote::TESTNET));
-  ASSERT_TRUE(wallet0.get_account().get_public_address_str(cryptonote::TESTNET) == wallet2.get_account().get_public_address_str(cryptonote::TESTNET));
-
-  bool ready;
-  uint32_t threshold, total;
-  ASSERT_TRUE(wallet0.multisig(&ready, &threshold, &total));
-  ASSERT_TRUE(ready);
-  ASSERT_TRUE(threshold == M);
-  ASSERT_TRUE(total == 3);
-  ASSERT_TRUE(wallet1.multisig(&ready, &threshold, &total));
-  ASSERT_TRUE(ready);
-  ASSERT_TRUE(threshold == M);
-  ASSERT_TRUE(total == 3);
-  ASSERT_TRUE(wallet2.multisig(&ready, &threshold, &total));
-  ASSERT_TRUE(ready);
-  ASSERT_TRUE(threshold == M);
-  ASSERT_TRUE(total == 3);
+  while (!mxis[0].empty()) {
+    mxis = exchange_round(wallets, mxis);
+  }
+
+  for (size_t i = 0; i < wallets.size(); ++i) {
+    ASSERT_TRUE(mxis[i].empty());
+    bool ready;
+    uint32_t threshold, total;
+    ASSERT_TRUE(wallets[i].multisig(&ready, &threshold, &total));
+    ASSERT_TRUE(ready);
+    ASSERT_TRUE(threshold == M);
+    ASSERT_TRUE(total == wallets.size());
+
+    if (i != 0) {
+      // "equals" is transitive relation so we need only to compare first wallet's address to each others' addresses. no need to compare 0's address with itself.
+      ASSERT_TRUE(wallets[0].get_account().get_public_address_str(cryptonote::TESTNET) == wallets[i].get_account().get_public_address_str(cryptonote::TESTNET));
+    }
+  }
 }
 
 TEST(multisig, make_2_2)
 {
-  tools::wallet2 wallet0, wallet1;
-  make_M_2_wallet(wallet0, wallet1, 2);
+  std::vector<tools::wallet2> wallets(2);
+  make_wallets(wallets, 2);
 }
 
 TEST(multisig, make_3_3)
 {
-  tools::wallet2 wallet0, wallet1, wallet2;
-  make_M_3_wallet(wallet0, wallet1, wallet2, 3);
+  std::vector<tools::wallet2> wallets(3);
+  make_wallets(wallets, 3);
 }
 
 TEST(multisig, make_2_3)
 {
-  tools::wallet2 wallet0, wallet1, wallet2;
-  make_M_3_wallet(wallet0, wallet1, wallet2, 2);
+  std::vector<tools::wallet2> wallets(3);
+  make_wallets(wallets, 2);
+}
+
+TEST(multisig, make_2_4)
+{
+  std::vector<tools::wallet2> wallets(4);
+  make_wallets(wallets, 2);
+}
+
+TEST(multisig, make_2_5)
+{
+  std::vector<tools::wallet2> wallets(5);
+  make_wallets(wallets, 2);
 }