/// <summary>
/// Will get the key from the Android keystore, creating it if necessary.
/// </summary>
/// <returns></returns>
IKey GetKey()
{
if (!_keystore.IsKeyEntry(KEY_NAME))
{
CreateKey();
}
IKey secretKey = _keystore.GetKey(KEY_NAME, null);
return(secretKey);
}
public string GetKey()
{
IKey secretKey;
if (!_keystore.IsKeyEntry(KEY_NAME))
{
GenKey();
}
secretKey = _keystore.GetKey(KEY_NAME, null);
return(secretKey.ToString());
}
/// <summary>
/// Will get the key from the Android keystore, creating it if necessary.
/// </summary>
/// <returns></returns>
IKey GetKey()
{
if (!_keystore.IsKeyEntry(_keyName))
{
CreateKey();
}
IKey secretKey = _keystore.GetKey(_keyName, null);
return(secretKey);
}
private BiometricPrompt.CryptoObject BuildSymmetricCryptoObject(string keyName, string cipherName, CipherMode mode, byte[] iv = null)
{
if (this.Log().IsEnabled(LogLevel.Debug))
{
this.Log().Debug($"Building a symmetric crypto object (key name: '{keyName}', mode: '{mode}').");
}
var cipher = Cipher.GetInstance(cipherName);
if (_keyStore.IsKeyEntry(keyName))
{
if (mode == CipherMode.EncryptMode)
{
_keyStore.DeleteEntry(keyName);
}
else if (mode == CipherMode.DecryptMode)
{
try
{
cipher.Init(mode, _keyStore.GetKey(keyName, null), new IvParameterSpec(iv));
return(new BiometricPrompt.CryptoObject(cipher));
}
catch (KeyPermanentlyInvalidatedException)
{
_keyStore.DeleteEntry(keyName);
throw;
}
}
}
else if (mode == CipherMode.DecryptMode)
{
throw new ArgumentException("Key not found.");
}
GenerateSymmetricKey(keyName);
cipher.Init(mode, _keyStore.GetKey(keyName, null));
if (this.Log().IsEnabled(LogLevel.Information))
{
this.Log().Info($"Return the symmetric crypto object (key name: '{keyName}', mode: '{mode}').");
}
return(new BiometricPrompt.CryptoObject(cipher));
}
public void RefreshItems()
{
_listItems.Clear();
foreach (String alias in KeyStore.Aliases)
{
KeyStoreEntryType entryType;
if (KeyStore.IsCertificateEntry(alias))
{
entryType = KeyStoreEntryType.TrustCertEntry;
}
else if (KeyStore.IsKeyEntry(alias) && KeyStore.GetCertificateChain(alias) != null && KeyStore.GetCertificateChain(alias).Length != 0)
{
entryType = KeyStoreEntryType.KeyPairEntry;
}
else
{
entryType = KeyStoreEntryType.KeyEntry;
}
_listItems.Add(new ListItemEntry(entryType, alias, KeyStore.GetCertificate(alias).Certificate));
}
}
