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NEP6Wallet.cs
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NEP6Wallet.cs
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// Copyright (C) 2015-2024 The Neo Project.
//
// NEP6Wallet.cs file belongs to the neo project and is free
// software distributed under the MIT software license, see the
// accompanying file LICENSE in the main directory of the
// repository or http://www.opensource.org/licenses/mit-license.php
// for more details.
//
// Redistribution and use in source and binary forms with or without
// modifications are permitted.
using Neo.Json;
using Neo.SmartContract;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Threading.Tasks;
namespace Neo.Wallets.NEP6
{
/// <summary>
/// An implementation of the NEP-6 wallet standard.
/// </summary>
/// <remarks>https://github.com/neo-project/proposals/blob/master/nep-6.mediawiki</remarks>
public class NEP6Wallet : Wallet
{
private string password;
private string name;
private Version version;
private readonly Dictionary<UInt160, NEP6Account> accounts;
private readonly JToken extra;
/// <summary>
/// The parameters of the SCrypt algorithm used for encrypting and decrypting the private keys in the wallet.
/// </summary>
public readonly ScryptParameters Scrypt;
public override string Name => name;
/// <summary>
/// The version of the wallet standard. It is currently fixed at 1.0 and will be used for functional upgrades in the future.
/// </summary>
public override Version Version => version;
/// <summary>
/// Loads or creates a wallet at the specified path.
/// </summary>
/// <param name="path">The path of the wallet file.</param>
/// <param name="password">The password of the wallet.</param>
/// <param name="settings">The <see cref="ProtocolSettings"/> to be used by the wallet.</param>
/// <param name="name">The name of the wallet. If the wallet is loaded from an existing file, this parameter is ignored.</param>
public NEP6Wallet(string path, string password, ProtocolSettings settings, string name = null) : base(path, settings)
{
this.password = password;
if (File.Exists(path))
{
JObject wallet = (JObject)JToken.Parse(File.ReadAllBytes(path));
LoadFromJson(wallet, out Scrypt, out accounts, out extra);
}
else
{
this.name = name;
this.version = Version.Parse("1.0");
this.Scrypt = ScryptParameters.Default;
this.accounts = new Dictionary<UInt160, NEP6Account>();
this.extra = JToken.Null;
}
}
/// <summary>
/// Loads the wallet with the specified JSON string.
/// </summary>
/// <param name="path">The path of the wallet.</param>
/// <param name="password">The password of the wallet.</param>
/// <param name="settings">The <see cref="ProtocolSettings"/> to be used by the wallet.</param>
/// <param name="json">The JSON object representing the wallet.</param>
public NEP6Wallet(string path, string password, ProtocolSettings settings, JObject json) : base(path, settings)
{
this.password = password;
LoadFromJson(json, out Scrypt, out accounts, out extra);
}
private void LoadFromJson(JObject wallet, out ScryptParameters scrypt, out Dictionary<UInt160, NEP6Account> accounts, out JToken extra)
{
this.version = Version.Parse(wallet["version"].AsString());
this.name = wallet["name"]?.AsString();
scrypt = ScryptParameters.FromJson((JObject)wallet["scrypt"]);
accounts = ((JArray)wallet["accounts"]).Select(p => NEP6Account.FromJson((JObject)p, this)).ToDictionary(p => p.ScriptHash);
extra = wallet["extra"];
if (!VerifyPasswordInternal(password))
throw new InvalidOperationException("Wrong password.");
}
private void AddAccount(NEP6Account account)
{
lock (accounts)
{
if (accounts.TryGetValue(account.ScriptHash, out NEP6Account account_old))
{
account.Label = account_old.Label;
account.IsDefault = account_old.IsDefault;
account.Lock = account_old.Lock;
if (account.Contract == null)
{
account.Contract = account_old.Contract;
}
else
{
NEP6Contract contract_old = (NEP6Contract)account_old.Contract;
if (contract_old != null)
{
NEP6Contract contract = (NEP6Contract)account.Contract;
contract.ParameterNames = contract_old.ParameterNames;
contract.Deployed = contract_old.Deployed;
}
}
account.Extra = account_old.Extra;
}
accounts[account.ScriptHash] = account;
}
}
public override bool Contains(UInt160 scriptHash)
{
lock (accounts)
{
return accounts.ContainsKey(scriptHash);
}
}
public override WalletAccount CreateAccount(byte[] privateKey)
{
if (privateKey is null) throw new ArgumentNullException(nameof(privateKey));
KeyPair key = new(privateKey);
if (key.PublicKey.IsInfinity) throw new ArgumentException(null, nameof(privateKey));
NEP6Contract contract = new()
{
Script = Contract.CreateSignatureRedeemScript(key.PublicKey),
ParameterList = new[] { ContractParameterType.Signature },
ParameterNames = new[] { "signature" },
Deployed = false
};
NEP6Account account = new(this, contract.ScriptHash, key, password)
{
Contract = contract
};
AddAccount(account);
return account;
}
public override WalletAccount CreateAccount(Contract contract, KeyPair key = null)
{
if (contract is not NEP6Contract nep6contract)
{
nep6contract = new NEP6Contract
{
Script = contract.Script,
ParameterList = contract.ParameterList,
ParameterNames = contract.ParameterList.Select((p, i) => $"parameter{i}").ToArray(),
Deployed = false
};
}
NEP6Account account;
if (key == null)
account = new NEP6Account(this, nep6contract.ScriptHash);
else
account = new NEP6Account(this, nep6contract.ScriptHash, key, password);
account.Contract = nep6contract;
AddAccount(account);
return account;
}
public override WalletAccount CreateAccount(UInt160 scriptHash)
{
NEP6Account account = new(this, scriptHash);
AddAccount(account);
return account;
}
/// <summary>
/// Decrypts the specified NEP-2 string with the password of the wallet.
/// </summary>
/// <param name="nep2key">The NEP-2 string to decrypt.</param>
/// <returns>The decrypted private key.</returns>
internal KeyPair DecryptKey(string nep2key)
{
return new KeyPair(GetPrivateKeyFromNEP2(nep2key, password, ProtocolSettings.AddressVersion, Scrypt.N, Scrypt.R, Scrypt.P));
}
public override void Delete()
{
if (File.Exists(Path)) File.Delete(Path);
}
public override bool DeleteAccount(UInt160 scriptHash)
{
lock (accounts)
{
return accounts.Remove(scriptHash);
}
}
public override WalletAccount GetAccount(UInt160 scriptHash)
{
lock (accounts)
{
accounts.TryGetValue(scriptHash, out NEP6Account account);
return account;
}
}
public override IEnumerable<WalletAccount> GetAccounts()
{
lock (accounts)
{
foreach (NEP6Account account in accounts.Values)
yield return account;
}
}
public override WalletAccount Import(X509Certificate2 cert)
{
KeyPair key;
using (ECDsa ecdsa = cert.GetECDsaPrivateKey())
{
key = new KeyPair(ecdsa.ExportParameters(true).D);
}
NEP6Contract contract = new()
{
Script = Contract.CreateSignatureRedeemScript(key.PublicKey),
ParameterList = new[] { ContractParameterType.Signature },
ParameterNames = new[] { "signature" },
Deployed = false
};
NEP6Account account = new(this, contract.ScriptHash, key, password)
{
Contract = contract
};
AddAccount(account);
return account;
}
public override WalletAccount Import(string wif)
{
KeyPair key = new(GetPrivateKeyFromWIF(wif));
NEP6Contract contract = new()
{
Script = Contract.CreateSignatureRedeemScript(key.PublicKey),
ParameterList = new[] { ContractParameterType.Signature },
ParameterNames = new[] { "signature" },
Deployed = false
};
NEP6Account account = new(this, contract.ScriptHash, key, password)
{
Contract = contract
};
AddAccount(account);
return account;
}
public override WalletAccount Import(string nep2, string passphrase, int N = 16384, int r = 8, int p = 8)
{
KeyPair key = new(GetPrivateKeyFromNEP2(nep2, passphrase, ProtocolSettings.AddressVersion, N, r, p));
NEP6Contract contract = new()
{
Script = Contract.CreateSignatureRedeemScript(key.PublicKey),
ParameterList = new[] { ContractParameterType.Signature },
ParameterNames = new[] { "signature" },
Deployed = false
};
NEP6Account account;
if (Scrypt.N == 16384 && Scrypt.R == 8 && Scrypt.P == 8)
account = new NEP6Account(this, contract.ScriptHash, nep2);
else
account = new NEP6Account(this, contract.ScriptHash, key, passphrase);
account.Contract = contract;
AddAccount(account);
return account;
}
/// <summary>
/// Exports the wallet as JSON
/// </summary>
public JObject ToJson()
{
return new()
{
["name"] = name,
["version"] = version.ToString(),
["scrypt"] = Scrypt.ToJson(),
["accounts"] = accounts.Values.Select(p => p.ToJson()).ToArray(),
["extra"] = extra
};
}
public override void Save()
{
File.WriteAllText(Path, ToJson().ToString());
}
public override bool VerifyPassword(string password)
{
return this.password == password;
}
private bool VerifyPasswordInternal(string password)
{
lock (accounts)
{
NEP6Account account = accounts.Values.FirstOrDefault(p => !p.Decrypted);
if (account == null)
{
account = accounts.Values.FirstOrDefault(p => p.HasKey);
}
if (account == null) return true;
if (account.Decrypted)
{
return account.VerifyPassword(password);
}
else
{
try
{
account.GetKey(password);
return true;
}
catch (FormatException)
{
return false;
}
}
}
}
public override bool ChangePassword(string oldPassword, string newPassword)
{
bool succeed = true;
lock (accounts)
{
Parallel.ForEach(accounts.Values, (account, state) =>
{
if (!account.ChangePasswordPrepare(oldPassword, newPassword))
{
state.Stop();
succeed = false;
}
});
}
if (succeed)
{
foreach (NEP6Account account in accounts.Values)
account.ChangePasswordCommit();
password = newPassword;
}
else
{
foreach (NEP6Account account in accounts.Values)
account.ChangePasswordRoolback();
}
return succeed;
}
}
}