public string DecryptedPrivateKeyString(string passphrase)
{
byte[] decryptedKey = this.DecryptPrivateKeyData(passphrase);
if (decryptedKey == null)
{
//Nothing to decrypt?
return("");
}
string privateKey;
Key key = null;
switch (this.PkType)
{
case PKType.BTC:
key = new Key(decryptedKey);
privateKey = key.GetWif(Network.Main).ToWif();
break;
case PKType.BTC_TestNet:
key = new Key(decryptedKey);
privateKey = key.GetWif(Network.TestNet).ToWif();
break;
// Generic failsafe, no parsing/validation
case PKType.UNSET:
case PKType.ETH:
case PKType.CUSTOM:
default:
privateKey = CryptographicBuffer.ConvertBinaryToString(BinaryStringEncoding.Utf8, decryptedKey.AsBuffer());
break;
case PKType.Mnemonic:
// TODO: Hardcoded to english, can add integrated OS detection or drop down for multilang
string[] words = BIP39Helpers.DecodeMnemonicFromEntropy(decryptedKey, Wordlist.English);
StringBuilder wordList = new StringBuilder();
foreach (string word in words)
{
wordList.Append($" {word}");
}
privateKey = wordList.ToString();
break;
}
return(privateKey);
}
private void MnemonicProvisionCardButton_Click(object sender, RoutedEventArgs e)
{
MnemonicErrorLabel.Content = "";
MnemonicKeyLabel.Content = "";
if (Mnemonicpassphrase.Password.Length == 0 || MnemonicpassphraseConfirmation.Password.Length == 0)
{
MnemonicErrorLabel.Content = "A passphrase was not entered.";
return;
}
if (Mnemonicpassphrase.Password != MnemonicpassphraseConfirmation.Password)
{
MnemonicErrorLabel.Content = "Passphrases entered did not match.";
return;
}
if (MnemonicEntryTextBox.Text.Length == 0)
{
MnemonicErrorLabel.Content = "No private key data to store.";
return;
}
if (CardPkType != PKType.Mnemonic)
{
MnemonicErrorLabel.Content = "Invalid application state. Please restart app.";
return;
}
byte[] privateKeyToEncrypt = null;
byte[] publicKeyData = CryptographicBuffer.ConvertStringToBinary("Mnemonic seed backed up.", BinaryStringEncoding.Utf8).ToArray();
try
{
privateKeyToEncrypt = BIP39Helpers.GenerateEntropyFromWords(MnemonicEntryTextBox.Text.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries), NBitcoin.Wordlist.English);
}
// TODO: Implement better exception types to ease debugging
catch (Exception ex)
{
Logger.Log(ex);
MnemonicErrorLabel.Content = "Failed to automatically parse mnemonic phrase.";
return;
}
if (privateKeyToEncrypt.Length > BChipMemoryLayout_BCHIP.PRIVATEKEY_MAX_DATA)
{
CreateKeyErrorLabel.Content =
$"Private key was {PrivateKeyTextBox.Text.Length} bytes, {Math.Abs(PrivateKeyTextBox.Text.Length - BChipMemoryLayout_BCHIP.PRIVATEKEY_MAX_DATA)} bytes over the limit.";
return;
}
string friendlyName = MnemonicFriendlyNameTextBox.Text;
ProvisionMnemonicPhraseViewGrid.Dispatcher.BeginInvoke(new Action(() =>
{
ProvisionMnemonicPhraseViewGrid.IsEnabled = false;
}));
Task.Run(new Action(() =>
{
try
{
UpdateTextLabel(MnemonicKeyLabel, "Setting up bChip! Do not remove card.");
// Encrypt data
BChipMemoryLayout_BCHIP bchip = LoadedBChips.SmartCardData as BChipMemoryLayout_BCHIP;
bchip.EncryptPrivateKeyData(CardPkType, Mnemonicpassphrase.Password, privateKeyToEncrypt, publicKeyData);
bchip.SetFriendlyName(friendlyName);
using (var context = _contextFactory.Establish(SCardScope.System))
{
using (var isoReader = new IsoReader(context, LoadedBChips.ReaderName, SCardShareMode.Shared, SCardProtocol.Any))
{
if (LoadedBChips.AdpuInterface.RequiresInit)
{
Response initResponse = isoReader.Transmit(LoadedBChips.AdpuInterface.InitCard());
if (initResponse.SW1 != 0x90)
{
Logger.Log("Error initializing smart card reader");
}
}
var unlockResponse = isoReader.Transmit(LoadedBChips.AdpuInterface.UnblockCard());
Logger.Log($"ADPU response from pin request: {unlockResponse.StatusWord:X}");
if (unlockResponse.SW1 != 0x90)
{
UpdateTextLabel(MnemonicKeyLabel, "");
UpdateTextLabel(MnemonicErrorLabel, "Could not be unlock bchip for writing.");
return;
}
var writeResponse = isoReader.Transmit(LoadedBChips.AdpuInterface.WriteCard(bchip));
Logger.Log($"ADPU response from write card data: {unlockResponse.StatusWord:X}");
if (writeResponse.SW1 != 0x90)
{
UpdateTextLabel(MnemonicKeyLabel, "");
UpdateTextLabel(MnemonicErrorLabel, "Failure writing data to the bchip.");
return;
}
}
}
UpdateTextLabel(MnemonicKeyLabel, string.Empty);
ClearTextBox(MnemonicFriendlyNameTextBox);
// Done? clear loaded card, reload card
LoadedBChips = null;
ScanAndLoadConnectedCards();
}
catch (Exception ex)
{
Logger.Log(ex);
}
finally
{
ProvisionMnemonicPhraseViewGrid.Dispatcher.BeginInvoke(new Action(() =>
{
ProvisionMnemonicPhraseViewGrid.IsEnabled = true;
}));
}
}));
}