public BiometricEncryption(BiometricModule biometric, string keyId) :
base(biometric, keyId)
{
_keyGen = biometric.KeyGenerator;
Kp2aLog.Log("FP: CreateKey ");
CreateKey();
}
protected override void OnResume()
{
base.OnResume();
BiometricModule fpModule = new BiometricModule(this);
HideRadioButtons();
if (!fpModule.IsHardwareAvailable)
{
//seems like not all Samsung Devices (e.g. Note 4) don't support the Android 6 fingerprint API
if (!TrySetupSamsung())
{
SetError(Resource.String.fingerprint_hardware_error);
}
UpdateCloseDatabaseAfterFailedBiometricQuickUnlockVisibility();
return;
}
if (!fpModule.IsAvailable)
{
SetError(Resource.String.fingerprint_no_enrolled);
return;
}
ShowRadioButtons();
UpdateCloseDatabaseAfterFailedBiometricQuickUnlockVisibility();
}
public BiometricCrypt(BiometricModule biometric, string keyId)
{
Kp2aLog.Log("FP: Create " + this.GetType().Name);
_keyId = keyId;
_cipher = biometric.Cipher;
_keystore = biometric.Keystore;
_activity = biometric.Activity;
}
public BiometricDecryption(BiometricModule biometric, string keyId, Context context, string prefKey)
: base(biometric, keyId)
{
_context = context;
_iv = Base64.Decode(PreferenceManager.GetDefaultSharedPreferences(context).GetString(GetIvPrefKey(prefKey), null), 0);
}
public BiometricDecryption(BiometricModule biometric, string keyId, byte[] iv) : base(biometric, keyId)
{
_iv = iv;
}
private bool InitFingerprintUnlock()
{
Kp2aLog.Log("InitFingerprintUnlock");
if (_biometryIdentifier != null)
{
Kp2aLog.Log("Already listening for fingerprint!");
return(true);
}
var btn = FindViewById <ImageButton>(Resource.Id.fingerprintbtn);
try
{
FingerprintUnlockMode um;
Enum.TryParse(PreferenceManager.GetDefaultSharedPreferences(this).GetString(App.Kp2a.GetDbForQuickUnlock().CurrentFingerprintModePrefKey, ""), out um);
btn.Visibility = (um != FingerprintUnlockMode.Disabled) ? ViewStates.Visible : ViewStates.Gone;
if (um == FingerprintUnlockMode.Disabled)
{
_biometryIdentifier = null;
return(false);
}
if (um == FingerprintUnlockMode.QuickUnlock && Util.GetCloseDatabaseAfterFailedBiometricQuickUnlock(this))
{
maxNumFailedAttempts = 3;
}
BiometricModule fpModule = new BiometricModule(this);
Kp2aLog.Log("fpModule.IsHardwareAvailable=" + fpModule.IsHardwareAvailable);
if (fpModule.IsHardwareAvailable) //see FingerprintSetupActivity
{
_biometryIdentifier = new BiometricDecryption(fpModule, App.Kp2a.GetDbForQuickUnlock().CurrentFingerprintPrefKey, this,
App.Kp2a.GetDbForQuickUnlock().CurrentFingerprintPrefKey);
}
if ((_biometryIdentifier == null) && (!BiometricDecryption.IsSetUp(this, App.Kp2a.GetDbForQuickUnlock().CurrentFingerprintPrefKey)))
{
try
{
Kp2aLog.Log("trying Samsung Fingerprint API...");
_biometryIdentifier = new BiometrySamsungIdentifier(this);
btn.Click += (sender, args) =>
{
if (_biometryIdentifier.Init())
{
if (numFailedAttempts < maxNumFailedAttempts)
{
_biometryIdentifier.StartListening(this);
}
}
};
Kp2aLog.Log("trying Samsung Fingerprint API...Seems to work!");
}
catch (Exception)
{
Kp2aLog.Log("trying Samsung Fingerprint API...failed.");
_biometryIdentifier = null;
}
}
if (_biometryIdentifier == null)
{
FindViewById <ImageButton>(Resource.Id.fingerprintbtn).Visibility = ViewStates.Gone;
return(false);
}
if (_biometryIdentifier.Init())
{
Kp2aLog.Log("successfully initialized fingerprint.");
btn.SetImageResource(Resource.Drawable.ic_fp_40px);
_biometryIdentifier.StartListening(this);
return(true);
}
else
{
Kp2aLog.Log("failed to initialize fingerprint.");
HandleFingerprintKeyInvalidated();
}
}
catch (Exception e)
{
Kp2aLog.Log("Error initializing Fingerprint Unlock: " + e);
btn.SetImageResource(Resource.Drawable.ic_fingerprint_error);
btn.Tag = "Error initializing Fingerprint Unlock: " + e;
_biometryIdentifier = null;
}
return(false);
}
