Merge pull request #6288

0349347e ringdb: use a different iv for key and data in rings table (moneromooo-monero)
7b882087 simplewallet: reword mixin in user message in terms of ring size (moneromooo-monero)
f507a43a wallet2: do not remove known rings when a tx fails (moneromooo-monero)

3 files changed, 38 insertions, 20 deletions

diff --git a/src/simplewallet/simplewallet.cpp b/src/simplewallet/simplewallet.cpp
index 19e3656c2..d981a48b8 100644
--- a/src/simplewallet/simplewallet.cpp
+++ b/src/simplewallet/simplewallet.cpp
@@ -1691,7 +1691,7 @@ bool simple_wallet::print_ring(const std::vector<std::string> &args)
       rings.push_back({key_image, ring});
     else if (!m_wallet->get_rings(txid, rings))
     {
-      fail_msg_writer() << tr("Key image either not spent, or spent with mixin 0");
+      fail_msg_writer() << tr("Key image either not spent, or spent with ring size 1");
       return true;
     }
 
diff --git a/src/wallet/ringdb.cpp b/src/wallet/ringdb.cpp
index b7efdd75c..5e88ea788 100644
--- a/src/wallet/ringdb.cpp
+++ b/src/wallet/ringdb.cpp
@@ -39,6 +39,8 @@
 #undef MONERO_DEFAULT_LOG_CATEGORY
 #define MONERO_DEFAULT_LOG_CATEGORY "wallet.ringdb"
 
+#define V1TAG ((uint64_t)798237759845202)
+
 static const char zerokey[8] = {0};
 static const MDB_val zerokeyval = { sizeof(zerokey), (void *)zerokey };
 
@@ -63,15 +65,16 @@ static int compare_uint64(const MDB_val *a, const MDB_val *b)
   return va < vb ? -1 : va > vb;
 }
 
-static std::string compress_ring(const std::vector<uint64_t> &ring)
+static std::string compress_ring(const std::vector<uint64_t> &ring, uint64_t tag)
 {
   std::string s;
+  s += tools::get_varint_data(tag);
   for (uint64_t out: ring)
     s += tools::get_varint_data(out);
   return s;
 }
 
-static std::vector<uint64_t> decompress_ring(const std::string &s)
+static std::vector<uint64_t> decompress_ring(const std::string &s, uint64_t tag)
 {
   std::vector<uint64_t> ring;
   int read = 0;
@@ -81,6 +84,13 @@ static std::vector<uint64_t> decompress_ring(const std::string &s)
     std::string tmp(i, s.cend());
     read = tools::read_varint(tmp.begin(), tmp.end(), out);
     THROW_WALLET_EXCEPTION_IF(read <= 0 || read > 256, tools::error::wallet_internal_error, "Internal error decompressing ring");
+    if (tag)
+    {
+      if (tag != out)
+        return {};
+      tag = 0;
+      continue;
+    }
     ring.push_back(out);
   }
   return ring;
@@ -93,25 +103,27 @@ std::string get_rings_filename(boost::filesystem::path filename)
   return filename.string();
 }
 
-static crypto::chacha_iv make_iv(const crypto::key_image &key_image, const crypto::chacha_key &key)
+static crypto::chacha_iv make_iv(const crypto::key_image &key_image, const crypto::chacha_key &key, uint8_t field)
 {
   static const char salt[] = "ringdsb";
 
-  uint8_t buffer[sizeof(key_image) + sizeof(key) + sizeof(salt)];
+  uint8_t buffer[sizeof(key_image) + sizeof(key) + sizeof(salt) + sizeof(field)];
   memcpy(buffer, &key_image, sizeof(key_image));
   memcpy(buffer + sizeof(key_image), &key, sizeof(key));
   memcpy(buffer + sizeof(key_image) + sizeof(key), salt, sizeof(salt));
+  memcpy(buffer + sizeof(key_image) + sizeof(key) + sizeof(salt), &field, sizeof(field));
   crypto::hash hash;
-  crypto::cn_fast_hash(buffer, sizeof(buffer), hash.data);
+  // if field is 0, backward compat mode: hash without the field
+  crypto::cn_fast_hash(buffer, sizeof(buffer) - !field, hash.data);
   static_assert(sizeof(hash) >= CHACHA_IV_SIZE, "Incompatible hash and chacha IV sizes");
   crypto::chacha_iv iv;
   memcpy(&iv, &hash, CHACHA_IV_SIZE);
   return iv;
 }
 
-static std::string encrypt(const std::string &plaintext, const crypto::key_image &key_image, const crypto::chacha_key &key)
+static std::string encrypt(const std::string &plaintext, const crypto::key_image &key_image, const crypto::chacha_key &key, uint8_t field)
 {
-  const crypto::chacha_iv iv = make_iv(key_image, key);
+  const crypto::chacha_iv iv = make_iv(key_image, key, field);
   std::string ciphertext;
   ciphertext.resize(plaintext.size() + sizeof(iv));
   crypto::chacha20(plaintext.data(), plaintext.size(), key, iv, &ciphertext[sizeof(iv)]);
@@ -119,14 +131,14 @@ static std::string encrypt(const std::string &plaintext, const crypto::key_image
   return ciphertext;
 }
 
-static std::string encrypt(const crypto::key_image &key_image, const crypto::chacha_key &key)
+static std::string encrypt(const crypto::key_image &key_image, const crypto::chacha_key &key, uint8_t field)
 {
-  return encrypt(std::string((const char*)&key_image, sizeof(key_image)), key_image, key);
+  return encrypt(std::string((const char*)&key_image, sizeof(key_image)), key_image, key, field);
 }
 
-static std::string decrypt(const std::string &ciphertext, const crypto::key_image &key_image, const crypto::chacha_key &key)
+static std::string decrypt(const std::string &ciphertext, const crypto::key_image &key_image, const crypto::chacha_key &key, uint8_t field)
 {
-  const crypto::chacha_iv iv = make_iv(key_image, key);
+  const crypto::chacha_iv iv = make_iv(key_image, key, field);
   std::string plaintext;
   THROW_WALLET_EXCEPTION_IF(ciphertext.size() < sizeof(iv), tools::error::wallet_internal_error, "Bad ciphertext text");
   plaintext.resize(ciphertext.size() - sizeof(iv));
@@ -137,11 +149,11 @@ static std::string decrypt(const std::string &ciphertext, const crypto::key_imag
 static void store_relative_ring(MDB_txn *txn, MDB_dbi &dbi, const crypto::key_image &key_image, const std::vector<uint64_t> &relative_ring, const crypto::chacha_key &chacha_key)
 {
   MDB_val key, data;
-  std::string key_ciphertext = encrypt(key_image, chacha_key);
+  std::string key_ciphertext = encrypt(key_image, chacha_key, 0);
   key.mv_data = (void*)key_ciphertext.data();
   key.mv_size = key_ciphertext.size();
-  std::string compressed_ring = compress_ring(relative_ring);
-  std::string data_ciphertext = encrypt(compressed_ring, key_image, chacha_key);
+  std::string compressed_ring = compress_ring(relative_ring, V1TAG);
+  std::string data_ciphertext = encrypt(compressed_ring, key_image, chacha_key, 1);
   data.mv_size = data_ciphertext.size();
   data.mv_data = (void*)data_ciphertext.c_str();
   int dbr = mdb_put(txn, dbi, &key, &data, 0);
@@ -297,7 +309,7 @@ bool ringdb::remove_rings(const crypto::chacha_key &chacha_key, const std::vecto
   for (const crypto::key_image &key_image: key_images)
   {
     MDB_val key, data;
-    std::string key_ciphertext = encrypt(key_image, chacha_key);
+    std::string key_ciphertext = encrypt(key_image, chacha_key, 0);
     key.mv_data = (void*)key_ciphertext.data();
     key.mv_size = key_ciphertext.size();
 
@@ -349,7 +361,7 @@ bool ringdb::get_ring(const crypto::chacha_key &chacha_key, const crypto::key_im
   tx_active = true;
 
   MDB_val key, data;
-  std::string key_ciphertext = encrypt(key_image, chacha_key);
+  std::string key_ciphertext = encrypt(key_image, chacha_key, 0);
   key.mv_data = (void*)key_ciphertext.data();
   key.mv_size = key_ciphertext.size();
   dbr = mdb_get(txn, dbi_rings, &key, &data);
@@ -358,8 +370,15 @@ bool ringdb::get_ring(const crypto::chacha_key &chacha_key, const crypto::key_im
     return false;
   THROW_WALLET_EXCEPTION_IF(data.mv_size <= 0, tools::error::wallet_internal_error, "Invalid ring data size");
 
-  std::string data_plaintext = decrypt(std::string((const char*)data.mv_data, data.mv_size), key_image, chacha_key);
-  outs = decompress_ring(data_plaintext);
+  bool try_v0 = false;
+  std::string data_plaintext = decrypt(std::string((const char*)data.mv_data, data.mv_size), key_image, chacha_key, 1);
+  try { outs = decompress_ring(data_plaintext, V1TAG); if (outs.empty()) try_v0 = true; }
+  catch(...) { try_v0 = true; }
+  if (try_v0)
+  {
+    data_plaintext = decrypt(std::string((const char*)data.mv_data, data.mv_size), key_image, chacha_key, 0);
+    outs = decompress_ring(data_plaintext, 0);
+  }
   MDEBUG("Found ring for key image " << key_image << ":");
   MDEBUG("Relative: " << boost::join(outs | boost::adaptors::transformed([](uint64_t out){return std::to_string(out);}), " "));
   outs = cryptonote::relative_output_offsets_to_absolute(outs);
diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index 7ee32a436..97711c7cd 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -2934,7 +2934,6 @@ void wallet2::update_pool_state(std::vector<std::tuple<cryptonote::transaction,
         pit->second.m_state = wallet2::unconfirmed_transfer_details::failed;
 
         // the inputs aren't spent anymore, since the tx failed
-        remove_rings(pit->second.m_tx);
         for (size_t vini = 0; vini < pit->second.m_tx.vin.size(); ++vini)
         {
           if (pit->second.m_tx.vin[vini].type() == typeid(txin_to_key))