Implement writing descriptorkeys, descriptorckeys, and descriptors to wallet file

src/wallet/scriptpubkeyman.cpp

@@ -1553,6 +1553,30 @@ void DescriptorScriptPubKeyMan::MarkUnusedAddresses(const CScript& script)
     }
 }
 
+bool DescriptorScriptPubKeyMan::AddDescriptorKeyWithDB(WalletBatch& batch, const CKey& key, const CPubKey &pubkey)
+{
+    AssertLockHeld(cs_desc_man);
+    assert(!m_storage.IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS));
+
+    if (m_storage.HasEncryptionKeys()) {
+        if (m_storage.IsLocked()) {
+            return false;
+        }
+
+        std::vector<unsigned char> crypted_secret;
+        CKeyingMaterial secret(key.begin(), key.end());
+        if (!EncryptSecret(m_storage.GetEncryptionKey(), secret, pubkey.GetHash(), crypted_secret)) {
+            return false;
+        }
+
+        m_map_crypted_keys[pubkey.GetID()] = make_pair(pubkey, crypted_secret);
+        return batch.WriteCryptedDescriptorKey(GetID(), pubkey, crypted_secret);
+    } else {
+        m_map_keys[pubkey.GetID()] = key;
+        return batch.WriteDescriptorKey(GetID(), pubkey, key.GetPrivKey());
+    }
+}
+
 bool DescriptorScriptPubKeyMan::IsHDEnabled() const
 {
     LOCK(cs_desc_man);

src/wallet/scriptpubkeyman.h

@@ -503,6 +503,8 @@ private:
 
     //! keeps track of whether Unlock has run a thorough check before
     bool m_decryption_thoroughly_checked = false;
+
+    bool AddDescriptorKeyWithDB(WalletBatch& batch, const CKey& key, const CPubKey &pubkey);
 public:
     DescriptorScriptPubKeyMan(WalletStorage& storage, WalletDescriptor& descriptor)
         :   ScriptPubKeyMan(storage),

src/wallet/walletdb.cpp

@@ -191,6 +191,31 @@ bool WalletBatch::WriteActiveScriptPubKeyMan(uint8_t type, const uint256& id, bo
     return WriteIC(make_pair(key, type), id);
 }
 
+bool WalletBatch::WriteDescriptorKey(const uint256& desc_id, const CPubKey& pubkey, const CPrivKey& privkey)
+{
+    // hash pubkey/privkey to accelerate wallet load
+    std::vector<unsigned char> key;
+    key.reserve(pubkey.size() + privkey.size());
+    key.insert(key.end(), pubkey.begin(), pubkey.end());
+    key.insert(key.end(), privkey.begin(), privkey.end());
+
+    return WriteIC(std::make_pair(DBKeys::WALLETDESCRIPTORKEY, std::make_pair(desc_id, pubkey)), std::make_pair(privkey, Hash(key.begin(), key.end())), false);
+}
+
+bool WalletBatch::WriteCryptedDescriptorKey(const uint256& desc_id, const CPubKey& pubkey, const std::vector<unsigned char>& secret)
+{
+    if (!WriteIC(std::make_pair(DBKeys::WALLETDESCRIPTORCKEY, std::make_pair(desc_id, pubkey)), secret, false)) {
+        return false;
+    }
+    EraseIC(std::make_pair(DBKeys::WALLETDESCRIPTORKEY, std::make_pair(desc_id, pubkey)));
+    return true;
+}
+
+bool WalletBatch::WriteDescriptor(const uint256& desc_id, const WalletDescriptor& descriptor)
+{
+    return WriteIC(make_pair(DBKeys::WALLETDESCRIPTOR, desc_id), descriptor);
+}
+
 class CWalletScanState {
 public:
     unsigned int nKeys{0};

src/wallet/walletdb.h

@@ -9,6 +9,7 @@
 #include <amount.h>
 #include <script/sign.h>
 #include <wallet/db.h>
+#include <wallet/walletutil.h>
 #include <key.h>
 
 #include <stdint.h>
@@ -245,6 +246,10 @@ public:
 
     bool WriteMinVersion(int nVersion);
 
+    bool WriteDescriptorKey(const uint256& desc_id, const CPubKey& pubkey, const CPrivKey& privkey);
+    bool WriteCryptedDescriptorKey(const uint256& desc_id, const CPubKey& pubkey, const std::vector<unsigned char>& secret);
+    bool WriteDescriptor(const uint256& desc_id, const WalletDescriptor& descriptor);
+
     /// Write destination data key,value tuple to database
     bool WriteDestData(const std::string &address, const std::string &key, const std::string &value);
     /// Erase destination data tuple from wallet database