package com.springer.patryk.mss.utils;

import android.content.SharedPreferences;
import android.util.Base64;

import org.mindrot.jbcrypt.BCrypt;

import java.security.SecureRandom;
import java.util.Random;

import se.simbio.encryption.Encryption;

/**
 * Created by Patryk on 2017-10-08.
 */

public class KeyStoreUtils {
    public static String encryptMessage(String password, String message, SharedPreferences sharedPreferences) {
        final SecureRandom secureRandom = new SecureRandom();
        byte[] iv = new byte[16];
        String salt = BCrypt.gensalt(12);
        secureRandom.nextBytes(iv);
        password = BCrypt.hashpw(password, salt);
        sharedPreferences.edit().putString("salt", salt).apply();
        sharedPreferences.edit().putString("iv", Base64.encodeToString(iv, Base64.DEFAULT)).apply();
        sharedPreferences.edit().putString("password", password).apply();
        Encryption encryption = Encryption.getDefault(password, salt, iv);
        return encryption.encryptOrNull(message);
    }
    public static String decryptMessage(String password, SharedPreferences sharedPreferences) {
        String salt = sharedPreferences.getString("salt", "");
        password = BCrypt.hashpw(password, salt);
        String encryptedMessage = sharedPreferences.getString("message", "");
        byte[] iv = Base64.decode(sharedPreferences.getString("iv",
                ""), Base64.DEFAULT);
        Encryption encryption = Encryption.getDefault(password, salt, iv);
        return encryption.decryptOrNull(encryptedMessage);
    }

    public static String decryptMessage(SharedPreferences sharedPreferences) {
        String password = sharedPreferences.getString("password", "");
        String encryptedMessage = sharedPreferences.getString("message", "");
        String salt = sharedPreferences.getString("salt", "");
        byte[] iv = Base64.decode(sharedPreferences.getString("iv",
                ""), Base64.DEFAULT);
        Encryption encryption = Encryption.getDefault(password, salt, iv);
        return encryption.decryptOrNull(encryptedMessage);
    }

}