scriptpubkeyman.h

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// Copyright (c) 2019-2022 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_WALLET_SCRIPTPUBKEYMAN_H
#define BITCOIN_WALLET_SCRIPTPUBKEYMAN_H
 
#include <addresstype.h>
#include <common/messages.h>
#include <common/signmessage.h>
#include <common/types.h>
#include <logging.h>
#include <node/types.h>
#include <psbt.h>
#include <script/descriptor.h>
#include <script/script.h>
#include <script/signingprovider.h>
#include <util/result.h>
#include <util/time.h>
#include <wallet/crypter.h>
#include <wallet/types.h>
#include <wallet/walletdb.h>
#include <wallet/walletutil.h>
 
#include <boost/signals2/signal.hpp>
 
#include <functional>
#include <optional>
#include <unordered_map>
 
enum class OutputType;
 
namespace wallet {
struct MigrationData;
class ScriptPubKeyMan;
 
// Wallet storage things that ScriptPubKeyMans need in order to be able to store things to the wallet database.
// It provides access to things that are part of the entire wallet and not specific to a ScriptPubKeyMan such as
// wallet flags, wallet version, encryption keys, encryption status, and the database itself. This allows a
// ScriptPubKeyMan to have callbacks into CWallet without causing a circular dependency.
// WalletStorage should be the same for all ScriptPubKeyMans of a wallet.
class WalletStorage
{
public:
    virtual ~WalletStorage() = default;
    virtual std::string GetDisplayName() const = 0;
    virtual WalletDatabase& GetDatabase() const = 0;
    virtual bool IsWalletFlagSet(uint64_t) const = 0;
    virtual void UnsetBlankWalletFlag(WalletBatch&) = 0;
    virtual bool CanSupportFeature(enum WalletFeature) const = 0;
    virtual void SetMinVersion(enum WalletFeature, WalletBatch* = nullptr) = 0;
    virtual bool WithEncryptionKey(std::function<bool (const CKeyingMaterial&)> cb) const = 0;
    virtual bool HasEncryptionKeys() const = 0;
    virtual bool IsLocked() const = 0;
    virtual void TopUpCallback(const std::set<CScript>&, ScriptPubKeyMan*) = 0;
};
 
static constexpr int64_t UNKNOWN_TIME = std::numeric_limits<int64_t>::max();
 
static const unsigned int DEFAULT_KEYPOOL_SIZE = 1000;
 
std::vector<CKeyID> GetAffectedKeys(const CScript& spk, const SigningProvider& provider);
 
class CKeyPool
{
public:
    int64_t nTime;
    CPubKey vchPubKey;
    bool fInternal;
    bool m_pre_split;
 
    CKeyPool();
    CKeyPool(const CPubKey& vchPubKeyIn, bool internalIn);
 
    template<typename Stream>
    void Serialize(Stream& s) const
    {
        s << int{259900}; // Unused field, writes the highest client version ever written
        s << nTime << vchPubKey << fInternal << m_pre_split;
    }
 
    template<typename Stream>
    void Unserialize(Stream& s)
    {
        s >> int{}; // Discard unused field
        s >> nTime >> vchPubKey;
        try {
            s >> fInternal;
        } catch (std::ios_base::failure&) {
            /* flag as external address if we can't read the internal boolean
               (this will be the case for any wallet before the HD chain split version) */
            fInternal = false;
        }
        try {
            s >> m_pre_split;
        } catch (std::ios_base::failure&) {
            /* flag as postsplit address if we can't read the m_pre_split boolean
               (this will be the case for any wallet that upgrades to HD chain split) */
            m_pre_split = false;
        }
    }
};
 
struct WalletDestination
{
    CTxDestination dest;
    std::optional<bool> internal;
};
 
/*
 * A class implementing ScriptPubKeyMan manages some (or all) scriptPubKeys used in a wallet.
 * It contains the scripts and keys related to the scriptPubKeys it manages.
 * A ScriptPubKeyMan will be able to give out scriptPubKeys to be used, as well as marking
 * when a scriptPubKey has been used. It also handles when and how to store a scriptPubKey
 * and its related scripts and keys, including encryption.
 */
class ScriptPubKeyMan
{
protected:
    WalletStorage& m_storage;
 
public:
    explicit ScriptPubKeyMan(WalletStorage& storage) : m_storage(storage) {}
    virtual ~ScriptPubKeyMan() = default;
    virtual util::Result<CTxDestination> GetNewDestination(const OutputType type) { return util::Error{Untranslated("Not supported")}; }
    virtual isminetype IsMine(const CScript& script) const { return ISMINE_NO; }
 
    virtual bool CheckDecryptionKey(const CKeyingMaterial& master_key) { return false; }
    virtual bool Encrypt(const CKeyingMaterial& master_key, WalletBatch* batch) { return false; }
 
    virtual util::Result<CTxDestination> GetReservedDestination(const OutputType type, bool internal, int64_t& index, CKeyPool& keypool) { return util::Error{Untranslated("Not supported")}; }
    virtual void KeepDestination(int64_t index, const OutputType& type) {}
    virtual void ReturnDestination(int64_t index, bool internal, const CTxDestination& addr) {}
 
    virtual bool TopUp(unsigned int size = 0) { return false; }
 
    virtual std::vector<WalletDestination> MarkUnusedAddresses(const CScript& script) { return {}; }
 
    virtual bool SetupGeneration(bool force = false) { return false; }
 
    /* Returns true if HD is enabled */
    virtual bool IsHDEnabled() const { return false; }
 
    /* Returns true if the wallet can give out new addresses. This means it has keys in the keypool or can generate new keys */
    virtual bool CanGetAddresses(bool internal = false) const { return false; }
 
    virtual bool Upgrade(int prev_version, int new_version, bilingual_str& error) { return true; }
 
    virtual bool HavePrivateKeys() const { return false; }
    virtual bool HaveCryptedKeys() const { return false; }
 
    virtual void RewriteDB() {}
 
    virtual std::optional<int64_t> GetOldestKeyPoolTime() const { return GetTime(); }
 
    virtual unsigned int GetKeyPoolSize() const { return 0; }
 
    virtual int64_t GetTimeFirstKey() const { return 0; }
 
    virtual std::unique_ptr<CKeyMetadata> GetMetadata(const CTxDestination& dest) const { return nullptr; }
 
    virtual std::unique_ptr<SigningProvider> GetSolvingProvider(const CScript& script) const { return nullptr; }
 
    virtual bool CanProvide(const CScript& script, SignatureData& sigdata) { return false; }
 
    virtual bool SignTransaction(CMutableTransaction& tx, const std::map<COutPoint, Coin>& coins, int sighash, std::map<int, bilingual_str>& input_errors) const { return false; }
    virtual SigningResult SignMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) const { return SigningResult::SIGNING_FAILED; };
    virtual std::optional<common::PSBTError> FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type = SIGHASH_DEFAULT, bool sign = true, bool bip32derivs = false, int* n_signed = nullptr, bool finalize = true) const { return common::PSBTError::UNSUPPORTED; }
 
    virtual uint256 GetID() const { return uint256(); }
 
    virtual std::unordered_set<CScript, SaltedSipHasher> GetScriptPubKeys() const { return {}; };
 
    template <typename... Params>
    void WalletLogPrintf(util::ConstevalFormatString<sizeof...(Params)> wallet_fmt, const Params&... params) const
    {
        LogInfo("%s %s", m_storage.GetDisplayName(), tfm::format(wallet_fmt, params...));
    };
 
    boost::signals2::signal<void (bool fHaveWatchOnly)> NotifyWatchonlyChanged;
 
    boost::signals2::signal<void ()> NotifyCanGetAddressesChanged;
 
    boost::signals2::signal<void (const ScriptPubKeyMan* spkm, int64_t new_birth_time)> NotifyFirstKeyTimeChanged;
};
 
static const std::unordered_set<OutputType> LEGACY_OUTPUT_TYPES {
    OutputType::LEGACY,
    OutputType::P2SH_SEGWIT,
    OutputType::BECH32,
};
 
class DescriptorScriptPubKeyMan;
 
// Manages the data for a LegacyScriptPubKeyMan.
// This is the minimum necessary to load a legacy wallet so that it can be migrated.
class LegacyDataSPKM : public ScriptPubKeyMan, public FillableSigningProvider
{
protected:
    using WatchOnlySet = std::set<CScript>;
    using WatchKeyMap = std::map<CKeyID, CPubKey>;
    using CryptedKeyMap = std::map<CKeyID, std::pair<CPubKey, std::vector<unsigned char>>>;
 
    CryptedKeyMap mapCryptedKeys GUARDED_BY(cs_KeyStore);
    WatchOnlySet setWatchOnly GUARDED_BY(cs_KeyStore);
    WatchKeyMap mapWatchKeys GUARDED_BY(cs_KeyStore);
 
    /* the HD chain data model (external chain counters) */
    CHDChain m_hd_chain;
    std::unordered_map<CKeyID, CHDChain, SaltedSipHasher> m_inactive_hd_chains;
 
    bool fDecryptionThoroughlyChecked = true;
 
    bool AddWatchOnlyInMem(const CScript &dest);
    virtual bool AddKeyPubKeyInner(const CKey& key, const CPubKey &pubkey);
    bool AddCryptedKeyInner(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
 
public:
    using ScriptPubKeyMan::ScriptPubKeyMan;
 
    // Map from Key ID to key metadata.
    std::map<CKeyID, CKeyMetadata> mapKeyMetadata GUARDED_BY(cs_KeyStore);
 
    // Map from Script ID to key metadata (for watch-only keys).
    std::map<CScriptID, CKeyMetadata> m_script_metadata GUARDED_BY(cs_KeyStore);
 
    // ScriptPubKeyMan overrides
    bool CheckDecryptionKey(const CKeyingMaterial& master_key) override;
    std::unordered_set<CScript, SaltedSipHasher> GetScriptPubKeys() const override;
    std::unique_ptr<SigningProvider> GetSolvingProvider(const CScript& script) const override;
    uint256 GetID() const override { return uint256::ONE; }
    // TODO: Remove IsMine when deleting LegacyScriptPubKeyMan
    isminetype IsMine(const CScript& script) const override;
 
    // FillableSigningProvider overrides
    bool HaveKey(const CKeyID &address) const override;
    bool GetKey(const CKeyID &address, CKey& keyOut) const override;
    bool GetPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) const override;
    bool GetKeyOrigin(const CKeyID& keyid, KeyOriginInfo& info) const override;
 
    std::set<int64_t> setInternalKeyPool GUARDED_BY(cs_KeyStore);
    std::set<int64_t> setExternalKeyPool GUARDED_BY(cs_KeyStore);
    std::set<int64_t> set_pre_split_keypool GUARDED_BY(cs_KeyStore);
    int64_t m_max_keypool_index GUARDED_BY(cs_KeyStore) = 0;
    std::map<CKeyID, int64_t> m_pool_key_to_index;
 
    virtual void LoadKeyMetadata(const CKeyID& keyID, const CKeyMetadata &metadata);
    virtual void LoadScriptMetadata(const CScriptID& script_id, const CKeyMetadata &metadata);
 
    bool LoadWatchOnly(const CScript &dest);
    bool HaveWatchOnly(const CScript &dest) const;
    bool HaveWatchOnly() const;
    bool LoadKey(const CKey& key, const CPubKey &pubkey);
    bool LoadCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret, bool checksum_valid);
    bool LoadCScript(const CScript& redeemScript);
    void LoadHDChain(const CHDChain& chain);
    void AddInactiveHDChain(const CHDChain& chain);
    const CHDChain& GetHDChain() const { return m_hd_chain; }
    void LoadKeyPool(int64_t nIndex, const CKeyPool &keypool);
 
    bool GetWatchPubKey(const CKeyID &address, CPubKey &pubkey_out) const;
 
    std::unordered_set<CScript, SaltedSipHasher> GetNotMineScriptPubKeys() const;
 
    std::optional<MigrationData> MigrateToDescriptor();
    bool DeleteRecords();
    bool DeleteRecordsWithDB(WalletBatch& batch);
};
 
// Implements the full legacy wallet behavior
class LegacyScriptPubKeyMan : public LegacyDataSPKM
{
private:
    WalletBatch *encrypted_batch GUARDED_BY(cs_KeyStore) = nullptr;
 
    // By default, do not scan any block until keys/scripts are generated/imported
    int64_t nTimeFirstKey GUARDED_BY(cs_KeyStore) = UNKNOWN_TIME;
 
    int64_t m_keypool_size GUARDED_BY(cs_KeyStore){DEFAULT_KEYPOOL_SIZE};
 
    bool AddKeyPubKeyInner(const CKey& key, const CPubKey &pubkey) override;
 
    bool AddWatchOnly(const CScript& dest) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
    bool AddWatchOnlyWithDB(WalletBatch &batch, const CScript& dest) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
    bool AddWatchOnlyWithDB(WalletBatch &batch, const CScript& dest, int64_t create_time) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
 
    bool AddKeyPubKeyWithDB(WalletBatch &batch,const CKey& key, const CPubKey &pubkey) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
 
    void AddKeypoolPubkeyWithDB(const CPubKey& pubkey, const bool internal, WalletBatch& batch);
 
    bool AddCScriptWithDB(WalletBatch& batch, const CScript& script);
 
    bool AddKeyOriginWithDB(WalletBatch& batch, const CPubKey& pubkey, const KeyOriginInfo& info);
 
    /* HD derive new child key (on internal or external chain) */
    void DeriveNewChildKey(WalletBatch& batch, CKeyMetadata& metadata, CKey& secret, CHDChain& hd_chain, bool internal = false) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
 
    // Tracks keypool indexes to CKeyIDs of keys that have been taken out of the keypool but may be returned to it
    std::map<int64_t, CKeyID> m_index_to_reserved_key;
 
    bool GetKeyFromPool(CPubKey &key, const OutputType type);
 
    bool ReserveKeyFromKeyPool(int64_t& nIndex, CKeyPool& keypool, bool fRequestedInternal);
 
    bool TopUpInactiveHDChain(const CKeyID seed_id, int64_t index, bool internal);
 
    bool TopUpChain(WalletBatch& batch, CHDChain& chain, unsigned int size);
public:
    LegacyScriptPubKeyMan(WalletStorage& storage, int64_t keypool_size) : LegacyDataSPKM(storage), m_keypool_size(keypool_size) {}
 
    util::Result<CTxDestination> GetNewDestination(const OutputType type) override;
 
    bool Encrypt(const CKeyingMaterial& master_key, WalletBatch* batch) override;
 
    util::Result<CTxDestination> GetReservedDestination(const OutputType type, bool internal, int64_t& index, CKeyPool& keypool) override;
    void KeepDestination(int64_t index, const OutputType& type) override;
    void ReturnDestination(int64_t index, bool internal, const CTxDestination&) override;
 
    bool TopUp(unsigned int size = 0) override;
 
    std::vector<WalletDestination> MarkUnusedAddresses(const CScript& script) override;
 
    void UpgradeKeyMetadata();
 
    bool IsHDEnabled() const override;
 
    bool SetupGeneration(bool force = false) override;
 
    bool Upgrade(int prev_version, int new_version, bilingual_str& error) override;
 
    bool HavePrivateKeys() const override;
    bool HaveCryptedKeys() const override;
 
    void RewriteDB() override;
 
    std::optional<int64_t> GetOldestKeyPoolTime() const override;
    size_t KeypoolCountExternalKeys() const;
    unsigned int GetKeyPoolSize() const override;
 
    int64_t GetTimeFirstKey() const override;
 
    std::unique_ptr<CKeyMetadata> GetMetadata(const CTxDestination& dest) const override;
 
    bool CanGetAddresses(bool internal = false) const override;
 
    bool CanProvide(const CScript& script, SignatureData& sigdata) override;
 
    bool SignTransaction(CMutableTransaction& tx, const std::map<COutPoint, Coin>& coins, int sighash, std::map<int, bilingual_str>& input_errors) const override;
    SigningResult SignMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) const override;
    std::optional<common::PSBTError> FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type = SIGHASH_DEFAULT, bool sign = true, bool bip32derivs = false, int* n_signed = nullptr, bool finalize = true) const override;
 
    uint256 GetID() const override;
 
    bool AddKeyPubKey(const CKey& key, const CPubKey &pubkey) override;
    bool AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
    void UpdateTimeFirstKey(int64_t nCreateTime) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
    void LoadKeyMetadata(const CKeyID& keyID, const CKeyMetadata &metadata) override;
    void LoadScriptMetadata(const CScriptID& script_id, const CKeyMetadata &metadata) override;
    CPubKey GenerateNewKey(WalletBatch& batch, CHDChain& hd_chain, bool internal = false) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
 
    /* Set the HD chain model (chain child index counters) and writes it to the database */
    void AddHDChain(const CHDChain& chain);
 
    bool RemoveWatchOnly(const CScript &dest);
    bool AddWatchOnly(const CScript& dest, int64_t nCreateTime) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
 
    /* SigningProvider overrides */
    bool AddCScript(const CScript& redeemScript) override;
 
    bool NewKeyPool();
    void MarkPreSplitKeys() EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
 
    bool ImportScripts(const std::set<CScript> scripts, int64_t timestamp) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
    bool ImportPrivKeys(const std::map<CKeyID, CKey>& privkey_map, const int64_t timestamp) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
    bool ImportPubKeys(const std::vector<std::pair<CKeyID, bool>>& ordered_pubkeys, const std::map<CKeyID, CPubKey>& pubkey_map, const std::map<CKeyID, std::pair<CPubKey, KeyOriginInfo>>& key_origins, const bool add_keypool, const int64_t timestamp) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
    bool ImportScriptPubKeys(const std::set<CScript>& script_pub_keys, const bool have_solving_data, const int64_t timestamp) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
 
    /* Returns true if the wallet can generate new keys */
    bool CanGenerateKeys() const;
 
    /* Generates a new HD seed (will not be activated) */
    CPubKey GenerateNewSeed();
 
    /* Derives a new HD seed (will not be activated) */
    CPubKey DeriveNewSeed(const CKey& key);
 
    /* Set the current HD seed (will reset the chain child index counters)
       Sets the seed's version based on the current wallet version (so the
       caller must ensure the current wallet version is correct before calling
       this function). */
    void SetHDSeed(const CPubKey& key);
 
    void LearnRelatedScripts(const CPubKey& key, OutputType);
 
    void LearnAllRelatedScripts(const CPubKey& key);
 
    std::vector<CKeyPool> MarkReserveKeysAsUsed(int64_t keypool_id) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
    const std::map<CKeyID, int64_t>& GetAllReserveKeys() const { return m_pool_key_to_index; }
 
    std::set<CKeyID> GetKeys() const override;
};
 
class LegacySigningProvider : public SigningProvider
{
private:
    const LegacyDataSPKM& m_spk_man;
public:
    explicit LegacySigningProvider(const LegacyDataSPKM& spk_man) : m_spk_man(spk_man) {}
 
    bool GetCScript(const CScriptID &scriptid, CScript& script) const override { return m_spk_man.GetCScript(scriptid, script); }
    bool HaveCScript(const CScriptID &scriptid) const override { return m_spk_man.HaveCScript(scriptid); }
    bool GetPubKey(const CKeyID &address, CPubKey& pubkey) const override { return m_spk_man.GetPubKey(address, pubkey); }
    bool GetKey(const CKeyID &address, CKey& key) const override { return false; }
    bool HaveKey(const CKeyID &address) const override { return false; }
    bool GetKeyOrigin(const CKeyID& keyid, KeyOriginInfo& info) const override { return m_spk_man.GetKeyOrigin(keyid, info); }
};
 
class DescriptorScriptPubKeyMan : public ScriptPubKeyMan
{
    friend class LegacyDataSPKM;
private:
    using ScriptPubKeyMap = std::map<CScript, int32_t>; // Map of scripts to descriptor range index
    using PubKeyMap = std::map<CPubKey, int32_t>; // Map of pubkeys involved in scripts to descriptor range index
    using CryptedKeyMap = std::map<CKeyID, std::pair<CPubKey, std::vector<unsigned char>>>;
    using KeyMap = std::map<CKeyID, CKey>;
 
    ScriptPubKeyMap m_map_script_pub_keys GUARDED_BY(cs_desc_man);
    PubKeyMap m_map_pubkeys GUARDED_BY(cs_desc_man);
    int32_t m_max_cached_index = -1;
 
    KeyMap m_map_keys GUARDED_BY(cs_desc_man);
    CryptedKeyMap m_map_crypted_keys GUARDED_BY(cs_desc_man);
 
    bool m_decryption_thoroughly_checked = false;
 
    int64_t m_keypool_size GUARDED_BY(cs_desc_man){DEFAULT_KEYPOOL_SIZE};
 
    bool AddDescriptorKeyWithDB(WalletBatch& batch, const CKey& key, const CPubKey &pubkey) EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
 
    KeyMap GetKeys() const EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
 
    // Cached FlatSigningProviders to avoid regenerating them each time they are needed.
    mutable std::map<int32_t, FlatSigningProvider> m_map_signing_providers;
    // Fetch the SigningProvider for the given script and optionally include private keys
    std::unique_ptr<FlatSigningProvider> GetSigningProvider(const CScript& script, bool include_private = false) const;
    // Fetch the SigningProvider for a given index and optionally include private keys. Called by the above functions.
    std::unique_ptr<FlatSigningProvider> GetSigningProvider(int32_t index, bool include_private = false) const EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
 
protected:
    WalletDescriptor m_wallet_descriptor GUARDED_BY(cs_desc_man);
 
    bool TopUpWithDB(WalletBatch& batch, unsigned int size = 0);
 
public:
    DescriptorScriptPubKeyMan(WalletStorage& storage, WalletDescriptor& descriptor, int64_t keypool_size)
        :   ScriptPubKeyMan(storage),
            m_keypool_size(keypool_size),
            m_wallet_descriptor(descriptor)
        {}
    DescriptorScriptPubKeyMan(WalletStorage& storage, int64_t keypool_size)
        :   ScriptPubKeyMan(storage),
            m_keypool_size(keypool_size)
        {}
 
    mutable RecursiveMutex cs_desc_man;
 
    util::Result<CTxDestination> GetNewDestination(const OutputType type) override;
    isminetype IsMine(const CScript& script) const override;
 
    bool CheckDecryptionKey(const CKeyingMaterial& master_key) override;
    bool Encrypt(const CKeyingMaterial& master_key, WalletBatch* batch) override;
 
    util::Result<CTxDestination> GetReservedDestination(const OutputType type, bool internal, int64_t& index, CKeyPool& keypool) override;
    void ReturnDestination(int64_t index, bool internal, const CTxDestination& addr) override;
 
    // Tops up the descriptor cache and m_map_script_pub_keys. The cache is stored in the wallet file
    // and is used to expand the descriptor in GetNewDestination. DescriptorScriptPubKeyMan relies
    // more on ephemeral data than LegacyScriptPubKeyMan. For wallets using unhardened derivation
    // (with or without private keys), the "keypool" is a single xpub.
    bool TopUp(unsigned int size = 0) override;
 
    std::vector<WalletDestination> MarkUnusedAddresses(const CScript& script) override;
 
    bool IsHDEnabled() const override;
 
    bool SetupDescriptorGeneration(WalletBatch& batch, const CExtKey& master_key, OutputType addr_type, bool internal);
 
    bool HavePrivateKeys() const override;
    bool HasPrivKey(const CKeyID& keyid) const EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
    std::optional<CKey> GetKey(const CKeyID& keyid) const EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
    bool HaveCryptedKeys() const override;
 
    std::optional<int64_t> GetOldestKeyPoolTime() const override;
    unsigned int GetKeyPoolSize() const override;
 
    int64_t GetTimeFirstKey() const override;
 
    std::unique_ptr<CKeyMetadata> GetMetadata(const CTxDestination& dest) const override;
 
    bool CanGetAddresses(bool internal = false) const override;
 
    std::unique_ptr<SigningProvider> GetSolvingProvider(const CScript& script) const override;
 
    bool CanProvide(const CScript& script, SignatureData& sigdata) override;
 
    // Fetch the SigningProvider for the given pubkey and always include private keys. This should only be called by signing code.
    std::unique_ptr<FlatSigningProvider> GetSigningProvider(const CPubKey& pubkey) const;
 
    bool SignTransaction(CMutableTransaction& tx, const std::map<COutPoint, Coin>& coins, int sighash, std::map<int, bilingual_str>& input_errors) const override;
    SigningResult SignMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) const override;
    std::optional<common::PSBTError> FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type = SIGHASH_DEFAULT, bool sign = true, bool bip32derivs = false, int* n_signed = nullptr, bool finalize = true) const override;
 
    uint256 GetID() const override;
 
    void SetCache(const DescriptorCache& cache);
 
    bool AddKey(const CKeyID& key_id, const CKey& key);
    bool AddCryptedKey(const CKeyID& key_id, const CPubKey& pubkey, const std::vector<unsigned char>& crypted_key);
 
    bool HasWalletDescriptor(const WalletDescriptor& desc) const;
    void UpdateWalletDescriptor(WalletDescriptor& descriptor);
    bool CanUpdateToWalletDescriptor(const WalletDescriptor& descriptor, std::string& error);
    void AddDescriptorKey(const CKey& key, const CPubKey &pubkey);
    void WriteDescriptor();
 
    WalletDescriptor GetWalletDescriptor() const EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
    std::unordered_set<CScript, SaltedSipHasher> GetScriptPubKeys() const override;
    std::unordered_set<CScript, SaltedSipHasher> GetScriptPubKeys(int32_t minimum_index) const;
    int32_t GetEndRange() const;
 
    [[nodiscard]] bool GetDescriptorString(std::string& out, const bool priv) const;
 
    void UpgradeDescriptorCache();
};
 
struct MigrationData
{
    CExtKey master_key;
    std::vector<std::pair<std::string, int64_t>> watch_descs;
    std::vector<std::pair<std::string, int64_t>> solvable_descs;
    std::vector<std::unique_ptr<DescriptorScriptPubKeyMan>> desc_spkms;
    std::shared_ptr<CWallet> watchonly_wallet{nullptr};
    std::shared_ptr<CWallet> solvable_wallet{nullptr};
};
 
} // namespace wallet
 
#endif // BITCOIN_WALLET_SCRIPTPUBKEYMAN_H