From cc5a5e81217506ec6f9fff34056290f8f40a7396 Mon Sep 17 00:00:00 2001
From: furszy <matiasfurszyfer@protonmail.com>
Date: Fri, 18 Nov 2022 11:38:56 -0300
Subject: [PATCH 1/4] wallet: bugfix, invalid crypted key "checksum_valid" set

At wallet load time, we set the crypted key "checksum_valid" variable always to false.
Which, on every wallet decryption call, forces the process to re-write the entire ckeys to db when
it's not needed.
---
 src/wallet/walletdb.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index 6a8f0d24817..9d72323f462 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -482,7 +482,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
             if (!ssValue.eof()) {
                 uint256 checksum;
                 ssValue >> checksum;
-                if ((checksum_valid = Hash(vchPrivKey) != checksum)) {
+                if (!(checksum_valid = Hash(vchPrivKey) == checksum)) {
                     strErr = "Error reading wallet database: Encrypted key corrupt";
                     return false;
                 }

From ee7a984f85015b610be4929b7c35cb501c1fbf7c Mon Sep 17 00:00:00 2001
From: furszy <matiasfurszyfer@protonmail.com>
Date: Fri, 19 Aug 2022 11:13:41 -0300
Subject: [PATCH 2/4] refactor: unify test/util/wallet.h with
 wallet/test/util.h

files share the same purpose, and we shouldn't have wallet code
inside the test directory.

This later is needed to use wallet util functions in the bench
and test binaries without be forced to duplicate them.
---
 src/Makefile.test.include      |  2 --
 src/Makefile.test_util.include | 17 ++++++++++++-----
 src/bench/block_assemble.cpp   |  1 -
 src/bench/wallet_balance.cpp   |  4 +++-
 src/bench/wallet_create_tx.cpp |  2 +-
 src/bench/wallet_loading.cpp   |  2 +-
 src/test/util/wallet.cpp       | 32 --------------------------------
 src/test/util/wallet.h         | 29 -----------------------------
 src/wallet/test/util.cpp       | 22 ++++++++++++++++------
 src/wallet/test/util.h         |  8 ++++++++
 10 files changed, 41 insertions(+), 78 deletions(-)
 delete mode 100644 src/test/util/wallet.cpp
 delete mode 100644 src/test/util/wallet.h

diff --git a/src/Makefile.test.include b/src/Makefile.test.include
index 9a9424e84cd..74c30f1caf9 100644
--- a/src/Makefile.test.include
+++ b/src/Makefile.test.include
@@ -199,8 +199,6 @@ FUZZ_WALLET_SRC += \
 endif # USE_SQLITE
 
 BITCOIN_TEST_SUITE += \
-  wallet/test/util.cpp \
-  wallet/test/util.h \
   wallet/test/wallet_test_fixture.cpp \
   wallet/test/wallet_test_fixture.h \
   wallet/test/init_test_fixture.cpp \
diff --git a/src/Makefile.test_util.include b/src/Makefile.test_util.include
index d142572b276..a4e8b3f842f 100644
--- a/src/Makefile.test_util.include
+++ b/src/Makefile.test_util.include
@@ -18,8 +18,11 @@ TEST_UTIL_H = \
   test/util/str.h \
   test/util/transaction_utils.h \
   test/util/txmempool.h \
-  test/util/validation.h \
-  test/util/wallet.h
+  test/util/validation.h
+
+if ENABLE_WALLET
+TEST_UTIL_H += wallet/test/util.h
+endif # ENABLE_WALLET
 
 libtest_util_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(BOOST_CPPFLAGS)
 libtest_util_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
@@ -33,6 +36,10 @@ libtest_util_a_SOURCES = \
   test/util/str.cpp \
   test/util/transaction_utils.cpp \
   test/util/txmempool.cpp \
-  test/util/validation.cpp \
-  test/util/wallet.cpp \
-  $(TEST_UTIL_H)
+  test/util/validation.cpp
+
+if ENABLE_WALLET
+libtest_util_a_SOURCES += wallet/test/util.cpp
+endif # ENABLE_WALLET
+
+libtest_util_a_SOURCES += $(TEST_UTIL_H)
diff --git a/src/bench/block_assemble.cpp b/src/bench/block_assemble.cpp
index 09be011fda6..69258377d5b 100644
--- a/src/bench/block_assemble.cpp
+++ b/src/bench/block_assemble.cpp
@@ -8,7 +8,6 @@
 #include <test/util/mining.h>
 #include <test/util/script.h>
 #include <test/util/setup_common.h>
-#include <test/util/wallet.h>
 #include <txmempool.h>
 #include <validation.h>
 
diff --git a/src/bench/wallet_balance.cpp b/src/bench/wallet_balance.cpp
index 22d99c0e29d..5a52774a8eb 100644
--- a/src/bench/wallet_balance.cpp
+++ b/src/bench/wallet_balance.cpp
@@ -7,7 +7,7 @@
 #include <node/context.h>
 #include <test/util/mining.h>
 #include <test/util/setup_common.h>
-#include <test/util/wallet.h>
+#include <wallet/test/util.h>
 #include <validationinterface.h>
 #include <wallet/receive.h>
 #include <wallet/wallet.h>
@@ -20,6 +20,8 @@ using wallet::DBErrors;
 using wallet::GetBalance;
 using wallet::WALLET_FLAG_DESCRIPTORS;
 
+const std::string ADDRESS_BCRT1_UNSPENDABLE = "bcrt1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq3xueyj";
+
 static void WalletBalance(benchmark::Bench& bench, const bool set_dirty, const bool add_mine)
 {
     const auto test_setup = MakeNoLogFileContext<const TestingSetup>();
diff --git a/src/bench/wallet_create_tx.cpp b/src/bench/wallet_create_tx.cpp
index 8f5c50872bb..3cbf2c90081 100644
--- a/src/bench/wallet_create_tx.cpp
+++ b/src/bench/wallet_create_tx.cpp
@@ -9,9 +9,9 @@
 #include <kernel/chain.h>
 #include <node/context.h>
 #include <test/util/setup_common.h>
-#include <test/util/wallet.h>
 #include <validation.h>
 #include <wallet/spend.h>
+#include <wallet/test/util.h>
 #include <wallet/wallet.h>
 
 using wallet::CWallet;
diff --git a/src/bench/wallet_loading.cpp b/src/bench/wallet_loading.cpp
index 8bfaf3044bf..6c9936ccd9d 100644
--- a/src/bench/wallet_loading.cpp
+++ b/src/bench/wallet_loading.cpp
@@ -7,7 +7,7 @@
 #include <node/context.h>
 #include <test/util/mining.h>
 #include <test/util/setup_common.h>
-#include <test/util/wallet.h>
+#include <wallet/test/util.h>
 #include <util/translation.h>
 #include <validationinterface.h>
 #include <wallet/context.h>
diff --git a/src/test/util/wallet.cpp b/src/test/util/wallet.cpp
deleted file mode 100644
index 2dadffafb49..00000000000
--- a/src/test/util/wallet.cpp
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright (c) 2019-2021 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-#include <test/util/wallet.h>
-
-#include <key_io.h>
-#include <outputtype.h>
-#include <script/standard.h>
-#ifdef ENABLE_WALLET
-#include <util/check.h>
-#include <util/translation.h>
-#include <wallet/wallet.h>
-#endif
-
-using wallet::CWallet;
-
-const std::string ADDRESS_BCRT1_UNSPENDABLE = "bcrt1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq3xueyj";
-
-#ifdef ENABLE_WALLET
-std::string getnewaddress(CWallet& w)
-{
-    constexpr auto output_type = OutputType::BECH32;
-    return EncodeDestination(getNewDestination(w, output_type));
-}
-
-CTxDestination getNewDestination(CWallet& w, OutputType output_type)
-{
-    return *Assert(w.GetNewDestination(output_type, ""));
-}
-
-#endif // ENABLE_WALLET
diff --git a/src/test/util/wallet.h b/src/test/util/wallet.h
deleted file mode 100644
index d8f1db3fd7a..00000000000
--- a/src/test/util/wallet.h
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright (c) 2019 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-#ifndef BITCOIN_TEST_UTIL_WALLET_H
-#define BITCOIN_TEST_UTIL_WALLET_H
-
-#include <outputtype.h>
-#include <string>
-
-namespace wallet {
-class CWallet;
-} // namespace wallet
-
-// Constants //
-
-extern const std::string ADDRESS_BCRT1_UNSPENDABLE;
-
-// RPC-like //
-
-/** Import the address to the wallet */
-void importaddress(wallet::CWallet& wallet, const std::string& address);
-/** Returns a new encoded destination from the wallet (hardcoded to BECH32) */
-std::string getnewaddress(wallet::CWallet& w);
-/** Returns a new destination, of an specific type, from the wallet */
-CTxDestination getNewDestination(wallet::CWallet& w, OutputType output_type);
-
-
-#endif // BITCOIN_TEST_UTIL_WALLET_H
diff --git a/src/wallet/test/util.cpp b/src/wallet/test/util.cpp
index ab72721f9d3..fb15c1a451c 100644
--- a/src/wallet/test/util.cpp
+++ b/src/wallet/test/util.cpp
@@ -11,8 +11,6 @@
 #include <wallet/wallet.h>
 #include <wallet/walletdb.h>
 
-#include <boost/test/unit_test.hpp>
-
 #include <memory>
 
 namespace wallet {
@@ -39,10 +37,22 @@ std::unique_ptr<CWallet> CreateSyncedWallet(interfaces::Chain& chain, CChain& cc
     WalletRescanReserver reserver(*wallet);
     reserver.reserve();
     CWallet::ScanResult result = wallet->ScanForWalletTransactions(cchain.Genesis()->GetBlockHash(), /*start_height=*/0, /*max_height=*/{}, reserver, /*fUpdate=*/false, /*save_progress=*/false);
-    BOOST_CHECK_EQUAL(result.status, CWallet::ScanResult::SUCCESS);
-    BOOST_CHECK_EQUAL(result.last_scanned_block, cchain.Tip()->GetBlockHash());
-    BOOST_CHECK_EQUAL(*result.last_scanned_height, cchain.Height());
-    BOOST_CHECK(result.last_failed_block.IsNull());
+    assert(result.status == CWallet::ScanResult::SUCCESS);
+    assert(result.last_scanned_block == cchain.Tip()->GetBlockHash());
+    assert(*result.last_scanned_height == cchain.Height());
+    assert(result.last_failed_block.IsNull());
     return wallet;
 }
+
+std::string getnewaddress(CWallet& w)
+{
+    constexpr auto output_type = OutputType::BECH32;
+    return EncodeDestination(getNewDestination(w, output_type));
+}
+
+CTxDestination getNewDestination(CWallet& w, OutputType output_type)
+{
+    return *Assert(w.GetNewDestination(output_type, ""));
+}
+
 } // namespace wallet
diff --git a/src/wallet/test/util.h b/src/wallet/test/util.h
index 712d0251cd3..7fb496c82a7 100644
--- a/src/wallet/test/util.h
+++ b/src/wallet/test/util.h
@@ -5,11 +5,13 @@
 #ifndef BITCOIN_WALLET_TEST_UTIL_H
 #define BITCOIN_WALLET_TEST_UTIL_H
 
+#include <script/standard.h>
 #include <memory>
 
 class ArgsManager;
 class CChain;
 class CKey;
+enum class OutputType;
 namespace interfaces {
 class Chain;
 } // namespace interfaces
@@ -18,6 +20,12 @@ namespace wallet {
 class CWallet;
 
 std::unique_ptr<CWallet> CreateSyncedWallet(interfaces::Chain& chain, CChain& cchain, ArgsManager& args, const CKey& key);
+
+/** Returns a new encoded destination from the wallet (hardcoded to BECH32) */
+std::string getnewaddress(CWallet& w);
+/** Returns a new destination, of an specific type, from the wallet */
+CTxDestination getNewDestination(CWallet& w, OutputType output_type);
+
 } // namespace wallet
 
 #endif // BITCOIN_WALLET_TEST_UTIL_H

From 373c99633ec7f20557db2734c49116ee4ad15423 Mon Sep 17 00:00:00 2001
From: furszy <matiasfurszyfer@protonmail.com>
Date: Fri, 19 Aug 2022 11:29:44 -0300
Subject: [PATCH 3/4] refactor: move DuplicateMockDatabase to
 wallet/test/util.h

---
 src/bench/wallet_loading.cpp | 24 ------------------------
 src/wallet/test/util.cpp     | 24 ++++++++++++++++++++++++
 src/wallet/test/util.h       |  5 +++++
 3 files changed, 29 insertions(+), 24 deletions(-)

diff --git a/src/bench/wallet_loading.cpp b/src/bench/wallet_loading.cpp
index 6c9936ccd9d..2f7dc53b0c7 100644
--- a/src/bench/wallet_loading.cpp
+++ b/src/bench/wallet_loading.cpp
@@ -52,30 +52,6 @@ static void AddTx(CWallet& wallet)
     wallet.AddToWallet(MakeTransactionRef(mtx), TxStateInactive{});
 }
 
-static std::unique_ptr<WalletDatabase> DuplicateMockDatabase(WalletDatabase& database, DatabaseOptions& options)
-{
-    auto new_database = CreateMockWalletDatabase(options);
-
-    // Get a cursor to the original database
-    auto batch = database.MakeBatch();
-    batch->StartCursor();
-
-    // Get a batch for the new database
-    auto new_batch = new_database->MakeBatch();
-
-    // Read all records from the original database and write them to the new one
-    while (true) {
-        CDataStream key(SER_DISK, CLIENT_VERSION);
-        CDataStream value(SER_DISK, CLIENT_VERSION);
-        bool complete;
-        batch->ReadAtCursor(key, value, complete);
-        if (complete) break;
-        new_batch->Write(key, value);
-    }
-
-    return new_database;
-}
-
 static void WalletLoading(benchmark::Bench& bench, bool legacy_wallet)
 {
     const auto test_setup = MakeNoLogFileContext<TestingSetup>();
diff --git a/src/wallet/test/util.cpp b/src/wallet/test/util.cpp
index fb15c1a451c..f6c7ecb598b 100644
--- a/src/wallet/test/util.cpp
+++ b/src/wallet/test/util.cpp
@@ -44,6 +44,30 @@ std::unique_ptr<CWallet> CreateSyncedWallet(interfaces::Chain& chain, CChain& cc
     return wallet;
 }
 
+std::unique_ptr<WalletDatabase> DuplicateMockDatabase(WalletDatabase& database, DatabaseOptions& options)
+{
+    auto new_database = CreateMockWalletDatabase(options);
+
+    // Get a cursor to the original database
+    auto batch = database.MakeBatch();
+    batch->StartCursor();
+
+    // Get a batch for the new database
+    auto new_batch = new_database->MakeBatch();
+
+    // Read all records from the original database and write them to the new one
+    while (true) {
+        CDataStream key(SER_DISK, CLIENT_VERSION);
+        CDataStream value(SER_DISK, CLIENT_VERSION);
+        bool complete;
+        batch->ReadAtCursor(key, value, complete);
+        if (complete) break;
+        new_batch->Write(key, value);
+    }
+
+    return new_database;
+}
+
 std::string getnewaddress(CWallet& w)
 {
     constexpr auto output_type = OutputType::BECH32;
diff --git a/src/wallet/test/util.h b/src/wallet/test/util.h
index 7fb496c82a7..a2e361ddca0 100644
--- a/src/wallet/test/util.h
+++ b/src/wallet/test/util.h
@@ -18,9 +18,14 @@ class Chain;
 
 namespace wallet {
 class CWallet;
+struct DatabaseOptions;
+class WalletDatabase;
 
 std::unique_ptr<CWallet> CreateSyncedWallet(interfaces::Chain& chain, CChain& cchain, ArgsManager& args, const CKey& key);
 
+// Creates a copy of the provided database
+std::unique_ptr<WalletDatabase> DuplicateMockDatabase(WalletDatabase& database, DatabaseOptions& options);
+
 /** Returns a new encoded destination from the wallet (hardcoded to BECH32) */
 std::string getnewaddress(CWallet& w);
 /** Returns a new destination, of an specific type, from the wallet */

From 13d97608297bd56ed033d0e754d2e50447b02af0 Mon Sep 17 00:00:00 2001
From: furszy <matiasfurszyfer@protonmail.com>
Date: Fri, 18 Nov 2022 17:01:07 -0300
Subject: [PATCH 4/4] test: load wallet, coverage for crypted keys

Adds test coverage for the wallet's crypted key loading from db process.
The following scenarios are covered:

1) "All ckeys checksums valid" test:
   Loads an encrypted wallet with all the crypted keys with a valid checksum and
   verifies that 'CWallet::Unlock' doesn't force an entire crypted keys re-write.

   (we force a complete ckeys re-write if we find any missing crypted key checksum
    during the wallet loading process)

2) "Missing checksum in one ckey" test:
   Verifies that loading up a wallet with, at least one, 'ckey' with no checksum
   triggers a complete re-write of the crypted keys.

3) "Invalid ckey checksum error" test:
   Verifies that loading up a ckey with an invalid checksum stops the wallet loading
   process with a corruption error.

4) "Invalid ckey pubkey error" test:
   Verifies that loading up a ckey with an invalid pubkey stops the wallet loading
   process with a corruption error.
---
 src/wallet/test/walletload_tests.cpp | 135 +++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)

diff --git a/src/wallet/test/walletload_tests.cpp b/src/wallet/test/walletload_tests.cpp
index f45b69a4180..24d21c2f220 100644
--- a/src/wallet/test/walletload_tests.cpp
+++ b/src/wallet/test/walletload_tests.cpp
@@ -2,6 +2,7 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or https://www.opensource.org/licenses/mit-license.php.
 
+#include <wallet/test/util.h>
 #include <wallet/wallet.h>
 #include <test/util/setup_common.h>
 
@@ -50,5 +51,139 @@ BOOST_FIXTURE_TEST_CASE(wallet_load_unknown_descriptor, TestingSetup)
     }
 }
 
+bool HasAnyRecordOfType(WalletDatabase& db, const std::string& key)
+{
+    std::unique_ptr<DatabaseBatch> batch = db.MakeBatch(false);
+    BOOST_CHECK(batch->StartCursor());
+    while (true) {
+        CDataStream ssKey(SER_DISK, CLIENT_VERSION);
+        CDataStream ssValue(SER_DISK, CLIENT_VERSION);
+        bool complete;
+        BOOST_CHECK(batch->ReadAtCursor(ssKey, ssValue, complete));
+        if (complete) break;
+        std::string type;
+        ssKey >> type;
+        if (type == key) return true;
+    }
+    return false;
+}
+
+BOOST_FIXTURE_TEST_CASE(wallet_load_verif_crypted_key_checksum, TestingSetup)
+{
+    // The test duplicates the db so each case has its own db instance.
+    int NUMBER_OF_TESTS = 4;
+    std::vector<std::unique_ptr<WalletDatabase>> dbs;
+    CKey first_key;
+    auto get_db = [](std::vector<std::unique_ptr<WalletDatabase>>& dbs) {
+        std::unique_ptr<WalletDatabase> db = std::move(dbs.back());
+        dbs.pop_back();
+        return db;
+    };
+
+    {   // Context setup.
+        // Create and encrypt legacy wallet
+        std::shared_ptr<CWallet> wallet(new CWallet(m_node.chain.get(), "", m_args, CreateMockWalletDatabase()));
+        LOCK(wallet->cs_wallet);
+        auto legacy_spkm = wallet->GetOrCreateLegacyScriptPubKeyMan();
+        BOOST_CHECK(legacy_spkm->SetupGeneration(true));
+
+        // Get the first key in the wallet
+        CTxDestination dest = *Assert(legacy_spkm->GetNewDestination(OutputType::LEGACY));
+        CKeyID key_id = GetKeyForDestination(*legacy_spkm, dest);
+        BOOST_CHECK(legacy_spkm->GetKey(key_id, first_key));
+
+        // Encrypt the wallet and duplicate database
+        BOOST_CHECK(wallet->EncryptWallet("encrypt"));
+        wallet->Flush();
+
+        DatabaseOptions options;
+        for (int i=0; i < NUMBER_OF_TESTS; i++) {
+            dbs.emplace_back(DuplicateMockDatabase(wallet->GetDatabase(), options));
+        }
+    }
+
+    {
+        // First test case:
+        // Erase all the crypted keys from db and unlock the wallet.
+        // The wallet will only re-write the crypted keys to db if any checksum is missing at load time.
+        // So, if any 'ckey' record re-appears on db, then the checksums were not properly calculated, and we are re-writing
+        // the records every time that 'CWallet::Unlock' gets called, which is not good.
+
+        // Load the wallet and check that is encrypted
+        std::shared_ptr<CWallet> wallet(new CWallet(m_node.chain.get(), "", m_args, get_db(dbs)));
+        BOOST_CHECK_EQUAL(wallet->LoadWallet(), DBErrors::LOAD_OK);
+        BOOST_CHECK(wallet->IsCrypted());
+        BOOST_CHECK(HasAnyRecordOfType(wallet->GetDatabase(), DBKeys::CRYPTED_KEY));
+
+        // Now delete all records and check that the 'Unlock' function doesn't re-write them
+        BOOST_CHECK(wallet->GetLegacyScriptPubKeyMan()->DeleteRecords());
+        BOOST_CHECK(!HasAnyRecordOfType(wallet->GetDatabase(), DBKeys::CRYPTED_KEY));
+        BOOST_CHECK(wallet->Unlock("encrypt"));
+        BOOST_CHECK(!HasAnyRecordOfType(wallet->GetDatabase(), DBKeys::CRYPTED_KEY));
+    }
+
+    {
+        // Second test case:
+        // Verify that loading up a 'ckey' with no checksum triggers a complete re-write of the crypted keys.
+        std::unique_ptr<WalletDatabase> db = get_db(dbs);
+        {
+            std::unique_ptr<DatabaseBatch> batch = db->MakeBatch(false);
+            std::pair<std::vector<unsigned char>, uint256> value;
+            BOOST_CHECK(batch->Read(std::make_pair(DBKeys::CRYPTED_KEY, first_key.GetPubKey()), value));
+
+            const auto key = std::make_pair(DBKeys::CRYPTED_KEY, first_key.GetPubKey());
+            BOOST_CHECK(batch->Write(key, value.first, /*fOverwrite=*/true));
+        }
+
+        // Load the wallet and check that is encrypted
+        std::shared_ptr<CWallet> wallet(new CWallet(m_node.chain.get(), "", m_args, std::move(db)));
+        BOOST_CHECK_EQUAL(wallet->LoadWallet(), DBErrors::LOAD_OK);
+        BOOST_CHECK(wallet->IsCrypted());
+        BOOST_CHECK(HasAnyRecordOfType(wallet->GetDatabase(), DBKeys::CRYPTED_KEY));
+
+        // Now delete all ckey records and check that the 'Unlock' function re-writes them
+        // (this is because the wallet, at load time, found a ckey record with no checksum)
+        BOOST_CHECK(wallet->GetLegacyScriptPubKeyMan()->DeleteRecords());
+        BOOST_CHECK(!HasAnyRecordOfType(wallet->GetDatabase(), DBKeys::CRYPTED_KEY));
+        BOOST_CHECK(wallet->Unlock("encrypt"));
+        BOOST_CHECK(HasAnyRecordOfType(wallet->GetDatabase(), DBKeys::CRYPTED_KEY));
+    }
+
+    {
+        // Third test case:
+        // Verify that loading up a 'ckey' with an invalid checksum throws an error.
+        std::unique_ptr<WalletDatabase> db = get_db(dbs);
+        {
+            std::unique_ptr<DatabaseBatch> batch = db->MakeBatch(false);
+            std::vector<unsigned char> crypted_data;
+            BOOST_CHECK(batch->Read(std::make_pair(DBKeys::CRYPTED_KEY, first_key.GetPubKey()), crypted_data));
+
+            // Write an invalid checksum
+            std::pair<std::vector<unsigned char>, uint256> value = std::make_pair(crypted_data, uint256::ONE);
+            const auto key = std::make_pair(DBKeys::CRYPTED_KEY, first_key.GetPubKey());
+            BOOST_CHECK(batch->Write(key, value, /*fOverwrite=*/true));
+        }
+
+        std::shared_ptr<CWallet> wallet(new CWallet(m_node.chain.get(), "", m_args, std::move(db)));
+        BOOST_CHECK_EQUAL(wallet->LoadWallet(), DBErrors::CORRUPT);
+    }
+
+    {
+        // Fourth test case:
+        // Verify that loading up a 'ckey' with an invalid pubkey throws an error
+        std::unique_ptr<WalletDatabase> db = get_db(dbs);
+        {
+            CPubKey invalid_key;
+            BOOST_ASSERT(!invalid_key.IsValid());
+            const auto key = std::make_pair(DBKeys::CRYPTED_KEY, invalid_key);
+            std::pair<std::vector<unsigned char>, uint256> value;
+            BOOST_CHECK(db->MakeBatch(false)->Write(key, value, /*fOverwrite=*/true));
+        }
+
+        std::shared_ptr<CWallet> wallet(new CWallet(m_node.chain.get(), "", m_args, std::move(db)));
+        BOOST_CHECK_EQUAL(wallet->LoadWallet(), DBErrors::CORRUPT);
+    }
+}
+
 BOOST_AUTO_TEST_SUITE_END()
 } // namespace wallet