flschweiger

class Flutter < Formula
  desc "Google’s UI toolkit for mobile, web, and desktop from a single codebase"
  homepage "https://flutter.dev"
  url "https://storage.googleapis.com/flutter_infra/releases/releases_macos.json"
  version "sdk"

  require 'json'

  bottle :unneeded

flschweiger

{
  "name" : "Flutter",
  "clipboardFormat" : {
    "function" : "concat",
    "y" : ")",
    "x" : {
      "x" : "const Color(0xFF",
      "function" : "concat",
      "y" : {
        "x" : "hex[red]hex[green]hex[blue]",

flschweiger

class AuthCallbacks extends FingerprintManager.AuthenticationCallback {
  
        @Override
        public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
            // Called when a fingerprint is recognized.
          
            // The AuthenticationResult contains the CryptoObject which 
            // has been passed to the authenticate() method.
            Cipher cipher = result.getCryptoObject().getCipher();
            // Go on and use the 'unlocked' Cipher object...

flschweiger

fingerprintManager = (FingerprintManager)
    getSystemService(Context.FINGERPRINT_SERVICE);

fingerprintManager.authenticate(
    @Nullable FingerprintManager.CryptoObject cryptoObject,
    @Nullable CancellationSignal cancelSignal,
    0 /* optional flags - should be 0 */, 
    FingerprintManager.AuthenticationCallback callback, 
    @Nullable Handler handler);

flschweiger

@Override
protected void onActivityResult(int requestCode,
  int resultCode, Intent data) {
    if (requestCode == REQUEST_CODE_CREDENTIALS) {
        // Challenge completed, proceed with using cipher
        if (resultCode == RESULT_OK) {
            doSomeDecryptionHere();
        } else {
            // The user canceled or didn’t complete the lock screen
            // operation. Go to error/cancellation flow.

flschweiger

private void showAuthenticationScreen() {
    Intent in = mKeyguardManager.createConfirmDeviceCredentialIntent(
                    "Hey there!", "Please...");

    if (in != null) {
        startActivityForResult(in, REQUEST_CODE_CREDENTIALS);
    }
}

flschweiger

try {
    KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");
    keyStore.load(null);

    SecretKey secretKey = 
        (SecretKey) keyStore.getKey(SecurityConstants.KEY_AES, null);
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");

    // The next line may throw a UserNotAuthenticatedException and
    // we need to prompt the user to authenticate again

flschweiger

builder
    .setKeySize(256)
    .setBlockModes(KeyProperties.BLOCK_MODE_CBC)
    .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_PKCS7)
    .setUserAuthenticationRequired(true)
    .setUserAuthenticationValidityDurationSeconds(30);

flschweiger

// Init the Cipher and decrypt the ciphertext
cipher.init(Cipher.DECRYPT_MODE, secretKey, new IvParameterSpec(iv));
byte[] decryptedBytes = 
    cipher.doFinal(encryptedBytes);

flschweiger

// Get the AndroidKeyStore instance
KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");

// Relict of the JCA API - you have to call load even
// if you do not have an input stream you want to load or it'll crash
keyStore.load(null);

// Get the SecretKey from the KeyStore and instantiate a Cipher
SecretKey secretKey = 
    (SecretKey) keyStore.getKey("myAwesomeSecretKey01", null);