feat(wallet): IWalletAccount abstraction and WIF/xpub/xprv keystore import types

Introduce IWalletAccount interface to abstract HD, imported-xprv, WIF,
and watch-only account types. HdAccount implements the interface; the
new ImportedKeyAccount handles lists of WIF keys with fixed addresses
(no gap scanning, change returns to first address).

WalletLoader gains three factory methods:
- NewFromXpub: watch-only from SLIP-132 xpub/ypub/zpub
- NewFromXprv: spendable from SLIP-132 xprv/yprv/zprv
- NewFromWif: spendable from one or more WIF private keys

WalletDocument gains optional AccountXprv and WifKeys fields; AccountPath
and AccountXpub become nullable (absent for WIF wallets). IsWatchOnly
updated to cover all non-signing wallet kinds.

TransactionFactory and CLI OpenWallet() updated to IWalletAccount.
12 new unit tests in ImportedKeyAccountTests cover factory round-trips,
address derivation, and watch-only detection.
This commit is contained in:
2026-06-15 14:20:10 +02:00
parent 002c854497
commit 47b6064964
9 changed files with 459 additions and 18 deletions
+1 -1
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@@ -282,7 +282,7 @@ static int SaveWallet(string words, string[] o)
return 0;
}
static (WalletDocument, HdAccount, string) OpenWallet(string[] o)
static (WalletDocument, IWalletAccount, string) OpenWallet(string[] o)
{
var path = WalletPath(o, Profile(o));
if (!WalletStore.Exists(path))
+10 -3
View File
@@ -11,7 +11,7 @@ namespace PalladiumWallet.Core.Crypto;
/// quindi il watch-only funziona per costruzione. Il keystore completo
/// (cifratura, factory dal file wallet, §4.5) arriva con la persistenza (§8).
/// </summary>
public sealed class HdAccount
public sealed class HdAccount : IWalletAccount
{
private readonly ExtKey? _accountXprv;
@@ -86,7 +86,7 @@ public sealed class HdAccount
masterFingerprint ?? default);
public BitcoinAddress GetAddress(bool isChange, int index) =>
GetPublicKey(isChange, index).GetAddress(
GetPublicKey(isChange, index)!.GetAddress(
DerivationPaths.ScriptPubKeyTypeFor(Kind),
PalladiumNetworks.For(Profile.Kind));
@@ -94,9 +94,16 @@ public sealed class HdAccount
public BitcoinAddress GetChangeAddress(int index) => GetAddress(isChange: true, index);
public PubKey GetPublicKey(bool isChange, int index) =>
public PubKey? GetPublicKey(bool isChange, int index) =>
AccountXpub.Derive(DerivationPaths.AddressSubPath(isChange, index)).PubKey;
/// <summary>Chiave privata di un indirizzo; null se watch-only (§17).</summary>
public Key? GetPrivateKey(bool isChange, int index) =>
IsWatchOnly ? null : GetExtPrivateKey(isChange, index).PrivateKey;
/// <summary>Gli account HD usano il gap limit: nessuna lista fissa di indirizzi.</summary>
public IReadOnlyList<(BitcoinAddress Address, bool IsChange, int Index)>? FixedAddresses => null;
/// <summary>
/// Chiave privata estesa di un indirizzo. Lancia se watch-only: nessuna
/// chiave privata è derivabile dalle sole pubbliche (§17).
+34
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@@ -0,0 +1,34 @@
using NBitcoin;
using PalladiumWallet.Core.Chain;
namespace PalladiumWallet.Core.Crypto;
/// <summary>
/// Astrazione su tutti i tipi di account wallet (HD da seed, HD da xpub/xprv importata,
/// chiavi WIF importate). Consente a WalletSynchronizer e TransactionFactory di operare
/// indipendentemente dal tipo di keystore sottostante (blueprint §4.4–§4.5).
/// </summary>
public interface IWalletAccount
{
ScriptKind Kind { get; }
ChainProfile Profile { get; }
/// <summary>True se l'account non può firmare (assenza di chiavi private).</summary>
bool IsWatchOnly { get; }
BitcoinAddress GetAddress(bool isChange, int index);
BitcoinAddress GetReceiveAddress(int index);
BitcoinAddress GetChangeAddress(int index);
/// <summary>Null se la chiave pubblica non è ricavabile dall'account (indirizzi puri watch-only).</summary>
PubKey? GetPublicKey(bool isChange, int index);
/// <summary>Null se l'account è watch-only o l'indice è fuori range.</summary>
Key? GetPrivateKey(bool isChange, int index);
/// <summary>
/// Per gli account con indirizzi fissi (WIF importati) restituisce la lista
/// completa da scansionare; null per gli account HD che usano il gap limit.
/// </summary>
IReadOnlyList<(BitcoinAddress Address, bool IsChange, int Index)>? FixedAddresses { get; }
}
+58
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@@ -0,0 +1,58 @@
using NBitcoin;
using PalladiumWallet.Core.Chain;
namespace PalladiumWallet.Core.Crypto;
/// <summary>
/// Account da chiavi WIF singole importate (blueprint §4.4 — "Imported"):
/// lista fissa di indirizzi, nessuna derivazione HD, nessuna catena di change.
/// Il change va sempre al primo indirizzo importato.
/// </summary>
public sealed class ImportedKeyAccount : IWalletAccount
{
private readonly (BitcoinAddress Address, Key? PrivateKey)[] _entries;
public ScriptKind Kind { get; }
public ChainProfile Profile { get; }
public bool IsWatchOnly => _entries.All(e => e.PrivateKey is null);
public IReadOnlyList<(BitcoinAddress Address, bool IsChange, int Index)>? FixedAddresses =>
_entries.Select((e, i) => (e.Address, false, i)).ToList();
public ImportedKeyAccount(
IReadOnlyList<(BitcoinAddress Address, Key? PrivateKey)> entries,
ScriptKind kind, ChainProfile profile)
{
if (entries.Count == 0)
throw new ArgumentException("Almeno un indirizzo richiesto.", nameof(entries));
_entries = [.. entries];
Kind = kind;
Profile = profile;
}
public BitcoinAddress GetAddress(bool isChange, int index)
{
if (isChange || index < 0 || index >= _entries.Length)
return _entries[0].Address;
return _entries[index].Address;
}
public BitcoinAddress GetReceiveAddress(int index) => GetAddress(false, index);
/// <summary>Il change torna sempre al primo indirizzo importato.</summary>
public BitcoinAddress GetChangeAddress(int index) => _entries[0].Address;
public PubKey? GetPublicKey(bool isChange, int index)
{
if (isChange || index < 0 || index >= _entries.Length)
return null;
return _entries[index].PrivateKey?.PubKey;
}
public Key? GetPrivateKey(bool isChange, int index)
{
if (isChange || index < 0 || index >= _entries.Length)
return null;
return _entries[index].PrivateKey;
}
}
+28 -5
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@@ -26,14 +26,20 @@ public sealed class WalletDocument
/// <summary>Extension word BIP39 (§4.1); null se assente.</summary>
public string? Passphrase { get; set; }
/// <summary>Path di account (es. "84'/746'/0'").</summary>
public required string AccountPath { get; set; }
/// <summary>Path di account (es. "84'/746'/0'"); null per importati WIF.</summary>
public string? AccountPath { get; set; }
/// <summary>Xpub di account in SLIP-132: basta da sola per il watch-only.</summary>
public required string AccountXpub { get; set; }
/// <summary>Xpub di account in SLIP-132 per i wallet HD; null per importati WIF.</summary>
public string? AccountXpub { get; set; }
/// <summary>Xprv di account in SLIP-132; presente solo per import da xprv senza seed.</summary>
public string? AccountXprv { get; set; }
public string? MasterFingerprint { get; set; }
/// <summary>Chiavi WIF importate (in chiaro nel documento — va cifrato!).</summary>
public List<string>? WifKeys { get; set; }
/// <summary>Gap limit per la scansione indirizzi (§5), configurabile.</summary>
public int GapLimit { get; set; } = 20;
@@ -46,7 +52,10 @@ public sealed class WalletDocument
/// <summary>Cache dell'ultimo stato sincronizzato (saldo/storico mostrabili offline).</summary>
public SyncCache? Cache { get; set; }
public bool IsWatchOnly => Mnemonic is null;
public bool IsWatchOnly =>
Mnemonic is null &&
AccountXprv is null &&
(WifKeys is null || WifKeys.Count == 0);
private static readonly JsonSerializerOptions JsonOptions = new()
{
@@ -90,6 +99,20 @@ public sealed class SyncCache
public List<CachedTx> History { get; set; } = [];
public List<CachedUtxo> Utxos { get; set; } = [];
public List<CachedAddress> Addresses { get; set; } = [];
/// <summary>
/// Cache raw delle transazioni confermate (txid → hex). Evita di riscaricale
/// ad ogni avvio dell'app: le tx confermate sono immutabili per definizione.
/// Popolata anche parzialmente in caso di sync interrotta (es. -101):
/// il synchronizer riprende dal punto in cui si era fermato.
/// </summary>
public Dictionary<string, string>? RawTxHex { get; set; }
/// <summary>
/// Prove di Merkle già verificate (txid → altezza blocco). Evita di
/// riverificare le stesse prove ad ogni avvio: le conferme sono immutabili.
/// </summary>
public Dictionary<string, int>? VerifiedAt { get; set; }
}
/// <summary>Indirizzo scansionato con saldo proprio e numero di transazioni (vista indirizzi).</summary>
+3 -2
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@@ -27,7 +27,7 @@ public sealed class BuiltTransaction
/// invia-tutto con fee sottratta, change sulla catena interna, RBF di default.
/// Con un account watch-only produce la PSBT non firmata (§6.5).
/// </summary>
public sealed class TransactionFactory(HdAccount account)
public sealed class TransactionFactory(IWalletAccount account)
{
private Network Network => PalladiumNetworks.For(account.Profile.Kind);
@@ -82,7 +82,8 @@ public sealed class TransactionFactory(HdAccount account)
if (!account.IsWatchOnly)
{
builder.AddKeys(spendable
.Select(u => account.GetExtPrivateKey(u.IsChange, u.AddressIndex))
.Select(u => account.GetPrivateKey(u.IsChange, u.AddressIndex))
.OfType<Key>()
.ToArray());
}
+120 -6
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@@ -6,31 +6,58 @@ using PalladiumWallet.Core.Storage;
namespace PalladiumWallet.Core.Wallet;
/// <summary>
/// Ponte documento wallet ↔ dominio (blueprint §4.5): dal file ricostruisce
/// l'HdAccount giusto (da seed o watch-only da xpub). È l'embrione della
/// factory dei tipi di wallet; crescerà con multisig e importati.
/// Factory dei tipi di wallet (blueprint §4.5): dal documento ricostruisce il tipo
/// di account corretto (HD da seed, HD da xprv importata, importato WIF, watch-only).
/// </summary>
public static class WalletLoader
{
public static ChainProfile ProfileOf(WalletDocument doc) =>
ChainProfiles.For(Enum.Parse<NetKind>(doc.Network, ignoreCase: true));
public static HdAccount ToAccount(WalletDocument doc)
public static IWalletAccount ToAccount(WalletDocument doc)
{
var profile = ProfileOf(doc);
var kind = Enum.Parse<ScriptKind>(doc.ScriptKind);
var path = KeyPath.Parse(doc.AccountPath);
var network = PalladiumNetworks.For(profile.Kind);
// 1. HD da seed (caso più comune)
if (doc.Mnemonic is { } words)
{
if (!Bip39.TryParse(words, out var mnemonic))
throw new InvalidDataException("Mnemonica del file wallet non valida.");
var path = KeyPath.Parse(doc.AccountPath ?? DerivationPaths.AccountPath(kind, profile).ToString());
return HdAccount.FromSeed(Bip39.ToSeed(mnemonic!, doc.Passphrase), kind, profile, path);
}
// 2. HD da xprv importata (spendibile, senza seed)
if (doc.AccountXprv is { } xprvStr)
{
if (!Slip132.TryDecodePrivate(xprvStr, profile, out var xprv, out _))
throw new InvalidDataException("Xprv del file wallet non valida per questa rete.");
var path = doc.AccountPath is { Length: > 0 } p ? KeyPath.Parse(p) : null;
return HdAccount.FromAccountXprv(xprv!, kind, profile, path);
}
// 3. Chiavi WIF importate
if (doc.WifKeys is { Count: > 0 } wifKeys)
{
var entries = wifKeys.Select(wif =>
{
var secret = new BitcoinSecret(wif, network);
var addr = secret.PrivateKey.PubKey
.GetAddress(DerivationPaths.ScriptPubKeyTypeFor(kind), network);
return (addr, (Key?)secret.PrivateKey);
}).ToList();
return new ImportedKeyAccount(entries, kind, profile);
}
// 4. Watch-only da xpub
if (doc.AccountXpub is null)
throw new InvalidDataException("File wallet senza xpub e senza seed.");
if (!Slip132.TryDecodePublic(doc.AccountXpub, profile, out var xpub, out _))
throw new InvalidDataException("Xpub del file wallet non valida per questa rete.");
return HdAccount.FromAccountXpub(xpub!, kind, profile, path);
var accountPath = doc.AccountPath is { Length: > 0 } ap ? KeyPath.Parse(ap) : null;
return HdAccount.FromAccountXpub(xpub!, kind, profile, accountPath);
}
/// <summary>Crea il documento per un nuovo wallet da seed.</summary>
@@ -56,4 +83,91 @@ public static class WalletLoader
};
return (doc, account);
}
/// <summary>
/// Crea il documento da una xpub SLIP-132 importata (watch-only).
/// Rileva il ScriptKind dagli header SLIP-132; <paramref name="kindOverride"/> lo sovrascrive
/// per i prefissi ambigui (xpub può essere Legacy o Taproot).
/// </summary>
public static (WalletDocument Doc, HdAccount Account) NewFromXpub(
string slip132, ChainProfile profile, ScriptKind? kindOverride = null)
{
if (!Slip132.TryDecodePublic(slip132.Trim(), profile, out var xpub, out var detectedKind))
throw new InvalidDataException("Chiave pubblica estesa non valida o non riconosciuta per questa rete.");
var kind = kindOverride ?? detectedKind;
var account = HdAccount.FromAccountXpub(xpub!, kind, profile);
var doc = new WalletDocument
{
Network = profile.NetName,
ScriptKind = kind.ToString(),
AccountPath = account.AccountPath.ToString(),
AccountXpub = slip132.Trim(),
};
return (doc, account);
}
/// <summary>
/// Crea il documento da una xprv SLIP-132 importata (spendibile senza seed).
/// Il documento contiene la xprv in chiaro: deve essere obbligatoriamente cifrato.
/// </summary>
public static (WalletDocument Doc, HdAccount Account) NewFromXprv(
string slip132, ChainProfile profile, ScriptKind? kindOverride = null)
{
if (!Slip132.TryDecodePrivate(slip132.Trim(), profile, out var xprv, out var detectedKind))
throw new InvalidDataException("Chiave privata estesa non valida o non riconosciuta per questa rete.");
var kind = kindOverride ?? detectedKind;
var account = HdAccount.FromAccountXprv(xprv!, kind, profile);
var doc = new WalletDocument
{
Network = profile.NetName,
ScriptKind = kind.ToString(),
AccountPath = account.AccountPath.ToString(),
AccountXpub = account.ToSlip132(),
AccountXprv = slip132.Trim(),
};
return (doc, account);
}
/// <summary>
/// Crea il documento da una o più chiavi WIF importate.
/// Il documento contiene le chiavi WIF in chiaro: deve essere obbligatoriamente cifrato.
/// </summary>
public static (WalletDocument Doc, ImportedKeyAccount Account) NewFromWif(
IReadOnlyList<string> wifKeys, ScriptKind kind, ChainProfile profile)
{
if (wifKeys.Count == 0)
throw new InvalidDataException("Almeno una chiave WIF richiesta.");
var network = PalladiumNetworks.For(profile.Kind);
var entries = new List<(BitcoinAddress, Key?)>();
var wifStrings = new List<string>();
foreach (var raw in wifKeys)
{
BitcoinSecret secret;
try
{
secret = new BitcoinSecret(raw.Trim(), network);
}
catch (Exception ex)
{
throw new InvalidDataException($"Chiave WIF non valida: {ex.Message}");
}
var addr = secret.PrivateKey.PubKey
.GetAddress(DerivationPaths.ScriptPubKeyTypeFor(kind), network);
entries.Add((addr, secret.PrivateKey));
wifStrings.Add(raw.Trim());
}
var account = new ImportedKeyAccount(entries, kind, profile);
var doc = new WalletDocument
{
Network = profile.NetName,
ScriptKind = kind.ToString(),
WifKeys = wifStrings,
};
return (doc, account);
}
}