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Add post-quantum support for descriptor wallets

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This commit is contained in:
Capri 2026-09-04 22:08:16 +00:00
commit 302a94e1a5
Signed by: VextaProject
SSH key fingerprint: SHA256:739BZv8LvIDY2tR7lXLy/IQ6MaGTQtYcG9GNvCjmpVM
7 changed files with 253 additions and 28 deletions
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61
src/wallet/scriptpubkeyman.cpp
View file

@ -1102,6 +1102,67 @@ uint256 LegacyScriptPubKeyMan::GetID() const
return uint256::ONE;
}
uint256 DescriptorPQScriptPubKeyMan::GetID() const
{
// Stable wallet database identity reserved for descriptor-wallet PQ keys.
return uint256S("5051522d56455854412d44455343524950544f522d50512d4d414e4147455201");
}
bool DescriptorPQScriptPubKeyMan::SetupGeneration(bool force)
{
if (m_storage.IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
return false;
}
if (IsHDEnabled() && !force) {
return true;
}
if (m_storage.IsLocked()) {
return false;
}
// Create only the deterministic seed. No legacy EC keypool is generated.
SetHDSeed(GenerateNewSeed());
return true;
}
bool DescriptorPQScriptPubKeyMan::GetNewDestination(
const OutputType type,
CTxDestination& dest,
std::string& error)
{
if (type != OutputType::MLDSA && type != OutputType::SLHDSA) {
error = _("Error: Descriptor PQ manager only supports ML-DSA and SLH-DSA").translated;
return false;
}
// Existing descriptor wallets receive their PQ seed lazily on the first
// PQ address request, after the wallet has been unlocked.
if (!IsHDEnabled()) {
if (m_storage.IsLocked()) {
error = _("Error: Please enter the wallet passphrase with walletpassphrase first.").translated;
return false;
}
if (!SetupGeneration()) {
error = _("Error: Unable to initialize post-quantum wallet seed").translated;
return false;
}
}
return LegacyScriptPubKeyMan::GetNewDestination(type, dest, error);
}
bool DescriptorPQScriptPubKeyMan::CanGetAddresses(bool internal) const
{
if (internal || m_storage.IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
return false;
}
return IsHDEnabled() || !m_storage.IsLocked();
}
/**
* Update wallet first key creation time. This should be called whenever keys
* are added to the wallet, with the oldest key creation time.

19
src/wallet/scriptpubkeyman.h
View file

@ -570,6 +570,25 @@ public:
bool GetKeyOrigin(const CKeyID& keyid, KeyOriginInfo& info) const override { return m_spk_man.GetKeyOrigin(keyid, info); }
};
/**
* Post-quantum key manager used alongside descriptor wallets.
*
* Standard EC destinations remain managed by DescriptorScriptPubKeyMan.
* This manager owns deterministic ML-DSA / SLH-DSA receive keys only.
*/
class DescriptorPQScriptPubKeyMan final : public LegacyScriptPubKeyMan
{
public:
using LegacyScriptPubKeyMan::LegacyScriptPubKeyMan;
uint256 GetID() const override;
bool SetupGeneration(bool force = false) override;
bool GetNewDestination(const OutputType type, CTxDestination& dest, std::string& error) override;
bool TopUp(unsigned int size = 0) override { return true; }
bool CanGetAddresses(bool internal = false) const override;
};
class DescriptorScriptPubKeyMan : public ScriptPubKeyMan
{
private:

57
src/wallet/wallet.cpp
View file

@ -390,7 +390,9 @@ void CWallet::UpgradeDescriptorCache()
for (ScriptPubKeyMan* spkm : GetAllScriptPubKeyMans()) {
DescriptorScriptPubKeyMan* desc_spkm = dynamic_cast<DescriptorScriptPubKeyMan*>(spkm);
desc_spkm->UpgradeDescriptorCache();
if (desc_spkm) {
desc_spkm->UpgradeDescriptorCache();
}
}
SetWalletFlag(WALLET_FLAG_LAST_HARDENED_XPUB_CACHED);
}
@ -3093,6 +3095,41 @@ LegacyScriptPubKeyMan* CWallet::GetOrCreateLegacyScriptPubKeyMan()
return GetLegacyScriptPubKeyMan();
}
DescriptorPQScriptPubKeyMan* CWallet::GetDescriptorPQScriptPubKeyMan() const
{
if (!IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
return nullptr;
}
for (const auto& item : m_spk_managers) {
if (auto* pq = dynamic_cast<DescriptorPQScriptPubKeyMan*>(item.second.get())) {
return pq;
}
}
return nullptr;
}
DescriptorPQScriptPubKeyMan* CWallet::GetOrCreateDescriptorPQScriptPubKeyMan()
{
if (!IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS) ||
IsWalletFlagSet(WALLET_FLAG_EXTERNAL_SIGNER) ||
IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
return nullptr;
}
if (auto* existing = GetDescriptorPQScriptPubKeyMan()) {
return existing;
}
auto manager = std::make_unique<DescriptorPQScriptPubKeyMan>(*this);
auto* result = manager.get();
const uint256 id = result->GetID();
m_spk_managers[id] = std::move(manager);
return result;
}
void CWallet::SetupLegacyScriptPubKeyMan()
{
if (!m_internal_spk_managers.empty() || !m_external_spk_managers.empty() || !m_spk_managers.empty() || IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
@ -3174,6 +3211,24 @@ void CWallet::SetupDescriptorScriptPubKeyMans()
AddActiveScriptPubKeyMan(id, t, internal);
}
}
// ML-DSA and SLH-DSA are handled by a dedicated PQ manager.
// The PQ seed is initialized lazily on the first PQ address request.
if (!IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
auto* pq_manager = GetOrCreateDescriptorPQScriptPubKeyMan();
if (!pq_manager) {
throw std::runtime_error(std::string(__func__) + ": Could not create post-quantum ScriptPubKeyMan");
}
const uint256 pq_id = pq_manager->GetID();
if (GetScriptPubKeyMan(OutputType::MLDSA, false) != pq_manager) {
AddActiveScriptPubKeyMan(pq_id, OutputType::MLDSA, false);
}
if (GetScriptPubKeyMan(OutputType::SLHDSA, false) != pq_manager) {
AddActiveScriptPubKeyMan(pq_id, OutputType::SLHDSA, false);
}
}
} else {
ExternalSigner signer = ExternalSignerScriptPubKeyMan::GetExternalSigner();

2
src/wallet/wallet.h
View file

@ -856,6 +856,8 @@ public:
//! Get the LegacyScriptPubKeyMan which is used for all types, internal, and external.
LegacyScriptPubKeyMan* GetLegacyScriptPubKeyMan() const;
LegacyScriptPubKeyMan* GetOrCreateLegacyScriptPubKeyMan();
DescriptorPQScriptPubKeyMan* GetDescriptorPQScriptPubKeyMan() const;
DescriptorPQScriptPubKeyMan* GetOrCreateDescriptorPQScriptPubKeyMan();
//! Make a LegacyScriptPubKeyMan and set it for all types, internal, and external.
void SetupLegacyScriptPubKeyMan();

72
src/wallet/walletdb.cpp
View file

@ -463,7 +463,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
strErr = "Error reading wallet database: CPrivKey corrupt";
return false;
}
if (!pwallet->GetOrCreateLegacyScriptPubKeyMan()->LoadKey(key, vchPubKey))
if (!(pwallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS) ? static_cast<LegacyScriptPubKeyMan*>(pwallet->GetOrCreateDescriptorPQScriptPubKeyMan()) : pwallet->GetOrCreateLegacyScriptPubKeyMan())->LoadKey(key, vchPubKey))
{
strErr = "Error reading wallet database: LegacyScriptPubKeyMan::LoadKey failed";
return false;
@ -506,7 +506,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
wss.nCKeys++;
if (!pwallet->GetOrCreateLegacyScriptPubKeyMan()->LoadCryptedKey(vchPubKey, vchPrivKey, checksum_valid))
if (!(pwallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS) ? static_cast<LegacyScriptPubKeyMan*>(pwallet->GetOrCreateDescriptorPQScriptPubKeyMan()) : pwallet->GetOrCreateLegacyScriptPubKeyMan())->LoadCryptedKey(vchPubKey, vchPrivKey, checksum_valid))
{
strErr = "Error reading wallet database: LegacyScriptPubKeyMan::LoadCryptedKey failed";
return false;
@ -525,7 +525,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
return false;
}
if (!pwallet->GetOrCreateLegacyScriptPubKeyMan()->LoadPQKey(
if (!(pwallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS) ? static_cast<LegacyScriptPubKeyMan*>(pwallet->GetOrCreateDescriptorPQScriptPubKeyMan()) : pwallet->GetOrCreateLegacyScriptPubKeyMan())->LoadPQKey(
key_id, type, record.pubkey, record.secret)) {
strErr = "Error reading wallet database: LegacyScriptPubKeyMan::LoadPQKey failed";
return false;
@ -544,7 +544,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
return false;
}
if (!pwallet->GetOrCreateLegacyScriptPubKeyMan()->LoadCryptedPQKey(
if (!(pwallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS) ? static_cast<LegacyScriptPubKeyMan*>(pwallet->GetOrCreateDescriptorPQScriptPubKeyMan()) : pwallet->GetOrCreateLegacyScriptPubKeyMan())->LoadCryptedPQKey(
key_id, type, record.pubkey, record.secret)) {
strErr = "Error reading wallet database: LegacyScriptPubKeyMan::LoadCryptedPQKey failed";
return false;
@ -557,14 +557,14 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
CKeyMetadata keyMeta;
ssValue >> keyMeta;
wss.nKeyMeta++;
pwallet->GetOrCreateLegacyScriptPubKeyMan()->LoadPQKeyMetadata(key_id, keyMeta);
(pwallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS) ? static_cast<LegacyScriptPubKeyMan*>(pwallet->GetOrCreateDescriptorPQScriptPubKeyMan()) : pwallet->GetOrCreateLegacyScriptPubKeyMan())->LoadPQKeyMetadata(key_id, keyMeta);
} else if (strType == DBKeys::KEYMETA) {
CPubKey vchPubKey;
ssKey >> vchPubKey;
CKeyMetadata keyMeta;
ssValue >> keyMeta;
wss.nKeyMeta++;
pwallet->GetOrCreateLegacyScriptPubKeyMan()->LoadKeyMetadata(vchPubKey.GetID(), keyMeta);
(pwallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS) ? static_cast<LegacyScriptPubKeyMan*>(pwallet->GetOrCreateDescriptorPQScriptPubKeyMan()) : pwallet->GetOrCreateLegacyScriptPubKeyMan())->LoadKeyMetadata(vchPubKey.GetID(), keyMeta);
// Extract some CHDChain info from this metadata if it has any
if (keyMeta.nVersion >= CKeyMetadata::VERSION_WITH_HDDATA && !keyMeta.hd_seed_id.IsNull() && keyMeta.hdKeypath.size() > 0) {
@ -669,11 +669,11 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
} else if (strType == DBKeys::HDCHAIN) {
CHDChain chain;
ssValue >> chain;
pwallet->GetOrCreateLegacyScriptPubKeyMan()->LoadHDChain(chain);
(pwallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS) ? static_cast<LegacyScriptPubKeyMan*>(pwallet->GetOrCreateDescriptorPQScriptPubKeyMan()) : pwallet->GetOrCreateLegacyScriptPubKeyMan())->LoadHDChain(chain);
} else if (strType == DBKeys::PQHDCHAIN) {
PQHDChain chain;
ssValue >> chain;
pwallet->GetOrCreateLegacyScriptPubKeyMan()->LoadPQHDChain(chain);
(pwallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS) ? static_cast<LegacyScriptPubKeyMan*>(pwallet->GetOrCreateDescriptorPQScriptPubKeyMan()) : pwallet->GetOrCreateLegacyScriptPubKeyMan())->LoadPQHDChain(chain);
} else if (strType == DBKeys::OLD_KEY) {
strErr = "Found unsupported 'wkey' record, try loading with version 0.18";
return false;
@ -907,6 +907,15 @@ DBErrors WalletBatch::LoadWallet(CWallet* pwallet)
}
m_batch->CloseCursor();
// Descriptor wallets use one dedicated receive-side PQ manager.
// Existing v0.2.1 wallets may not have any PQ records yet, so create the
// empty manager before restoring active ScriptPubKeyMan mappings.
if (pwallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS) &&
!pwallet->IsWalletFlagSet(WALLET_FLAG_EXTERNAL_SIGNER) &&
!pwallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
pwallet->GetOrCreateDescriptorPQScriptPubKeyMan();
}
// Set the active ScriptPubKeyMans
for (auto spk_man_pair : wss.m_active_external_spks) {
pwallet->LoadActiveScriptPubKeyMan(spk_man_pair.second, spk_man_pair.first, /* internal */ false);
@ -915,6 +924,17 @@ DBErrors WalletBatch::LoadWallet(CWallet* pwallet)
pwallet->LoadActiveScriptPubKeyMan(spk_man_pair.second, spk_man_pair.first, /* internal */ true);
}
if (auto* pq_manager = pwallet->GetDescriptorPQScriptPubKeyMan()) {
const uint256 pq_id = pq_manager->GetID();
if (pwallet->GetScriptPubKeyMan(OutputType::MLDSA, false) != pq_manager) {
pwallet->AddActiveScriptPubKeyMan(pq_id, OutputType::MLDSA, false);
}
if (pwallet->GetScriptPubKeyMan(OutputType::SLHDSA, false) != pq_manager) {
pwallet->AddActiveScriptPubKeyMan(pq_id, OutputType::SLHDSA, false);
}
}
// Set the descriptor caches
for (auto desc_cache_pair : wss.m_descriptor_caches) {
auto spk_man = pwallet->GetScriptPubKeyMan(desc_cache_pair.first);
@ -940,21 +960,16 @@ DBErrors WalletBatch::LoadWallet(CWallet* pwallet)
if (result != DBErrors::LOAD_OK)
return result;
// Reconcile the post-quantum HD derivation state after all wallet
// database records have been loaded.
if (LegacyScriptPubKeyMan* legacy_spkm = pwallet->GetLegacyScriptPubKeyMan()) {
std::string pq_error;
if (!legacy_spkm->ReconcilePQHDChain(*this, pq_error)) {
pwallet->WalletLogPrintf("Error reconciling post-quantum HD chain: %s\n", pq_error);
return DBErrors::CORRUPT;
}
}
// Reconcile the post-quantum derivation counters after all relevant
// wallet records have been loaded.
LegacyScriptPubKeyMan* pq_spkm =
pwallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)
? static_cast<LegacyScriptPubKeyMan*>(pwallet->GetDescriptorPQScriptPubKeyMan())
: pwallet->GetLegacyScriptPubKeyMan();
// Reconcile the post-quantum HD derivation state after all wallet
// database records have been loaded.
if (LegacyScriptPubKeyMan* legacy_spkm = pwallet->GetLegacyScriptPubKeyMan()) {
if (pq_spkm) {
std::string pq_error;
if (!legacy_spkm->ReconcilePQHDChain(*this, pq_error)) {
if (!pq_spkm->ReconcilePQHDChain(*this, pq_error)) {
pwallet->WalletLogPrintf("Error reconciling post-quantum HD chain: %s\n", pq_error);
return DBErrors::CORRUPT;
}
@ -1010,14 +1025,19 @@ DBErrors WalletBatch::LoadWallet(CWallet* pwallet)
// Set the inactive chain
if (wss.m_hd_chains.size() > 0) {
LegacyScriptPubKeyMan* legacy_spkm = pwallet->GetLegacyScriptPubKeyMan();
if (!legacy_spkm) {
pwallet->WalletLogPrintf("Inactive HD Chains found but no Legacy ScriptPubKeyMan\n");
LegacyScriptPubKeyMan* hd_spkm =
pwallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)
? static_cast<LegacyScriptPubKeyMan*>(pwallet->GetDescriptorPQScriptPubKeyMan())
: pwallet->GetLegacyScriptPubKeyMan();
if (!hd_spkm) {
pwallet->WalletLogPrintf("Inactive HD Chains found but no compatible ScriptPubKeyMan\n");
return DBErrors::CORRUPT;
}
for (const auto& chain_pair : wss.m_hd_chains) {
if (chain_pair.first != pwallet->GetLegacyScriptPubKeyMan()->GetHDChain().seed_id) {
pwallet->GetLegacyScriptPubKeyMan()->AddInactiveHDChain(chain_pair.second);
if (chain_pair.first != hd_spkm->GetHDChain().seed_id) {
hd_spkm->AddInactiveHDChain(chain_pair.second);
}
}
}