challenge android

script.js

Java.perform(() => {
  let RootDetector = Java.use("***.*****.**********.RootDetector");
  RootDetector["isRooted"].implementation = function () {
    return false; // only for boolean function calling
  };
  let EmulatorDetector = Java.use("***.*****.*********.EmulatorDetector");
  EmulatorDetector["isEmulator"].implementation = function () { 
    return false; // only for boolean function calling
  };
  let AntiFrida = Java.use("***.*****.*********.AntiFrida");
  AntiFrida["isFridaRunning"].implementation = function () {
    return false; // only for boolean function calling
  };
});

test.java

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;

class HelloWorld {
    public static void main(String[] args) {
        try {
            byte[] key = "*************".getBytes(StandardCharsets.UTF_8);
            MessageDigest sha = MessageDigest.getInstance("SHA-256");
            byte[] keyBytes = Arrays.copyOf(sha.digest(key), 16);
            System.out.println(keyBytes);
            SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
            byte[] encryptedData = cipher.doFinal("true".getBytes(StandardCharsets.UTF_8));
            String base64EncryptedData = Base64.getEncoder().encodeToString(encryptedData);
            System.out.println(base64EncryptedData);
            System.out.println(checksum(base64EncryptedData));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    private static String checksum(String input) throws NoSuchAlgorithmException {
        MessageDigest digest = MessageDigest.getInstance("SHA-256");
        byte[] hash = digest.digest(input.getBytes(StandardCharsets.UTF_8));
        StringBuilder sb = new StringBuilder();
        for (byte b : hash) {
            sb.append(String.format("%02x", Byte.valueOf(b)));
        }
        return sb.toString();
    }
}