[Slow/Freeze] Creating pin on Samsung device

[Xpjay]

Describe the bug
I have multiples devices and with my two Samsung devices it take some times to create the pin and it's freezing the UI
Does anyone have this problem too ? Does the encryption works differently on samsung device ? (sorry for broken English)

To Reproduce
Steps to reproduce the behavior:

1. Have a Samsung device
2. Create code pin
3. See the time it take to create the pin

Expected behavior
Something instant like the others devices

Screenshots
Can't screen that

Smartphone:

• Device: [Samsung Galaxy S5 mini]
• OS: [6.0.1 (Marshmallow)]
• Library version Version [the last one]

[Xpjay]

I figured out that is was this part who takes 4-5 seconds on Samsung devices

` private boolean generateKey(String keystoreAlias, boolean isAuthenticationRequired) {

  try {
      final KeyPairGenerator keyGenerator = KeyPairGenerator.getInstance(
                KeyProperties.KEY_ALGORITHM_RSA, "AndroidKeyStore");
        keyGenerator.initialize(
                new KeyGenParameterSpec.Builder(keystoreAlias,
                        KeyProperties.PURPOSE_ENCRYPT |
                                KeyProperties.PURPOSE_DECRYPT)
                        .setDigests(KeyProperties.DIGEST_SHA256, KeyProperties.DIGEST_SHA512)
                        .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_OAEP)
                        .setUserAuthenticationRequired(isAuthenticationRequired)
                        .build());
        keyGenerator.generateKeyPair();
        return true;

    } catch ( NoSuchAlgorithmException
            | NoSuchProviderException
            | InvalidAlgorithmParameterException exc) {
        exc.printStackTrace();
        return false;
    }
}`

[Xpjay]

After testing some algorithm encryption I have revert my code then apply a workaround
WorkAround : I added a loader which isn't freeze to give the illusion :)