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package com.blogspot.dbh4ck.aes_encrypt_decrypt_android; |
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import android.os.Build; |
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import android.os.Bundle; |
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import android.os.Environment; |
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import android.support.design.widget.FloatingActionButton; |
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import android.support.design.widget.Snackbar; |
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import android.util.Base64; |
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import android.view.View; |
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import android.support.design.widget.NavigationView; |
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import android.support.v4.view.GravityCompat; |
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import android.support.v4.widget.DrawerLayout; |
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import android.support.v7.app.ActionBarDrawerToggle; |
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import android.support.v7.app.AppCompatActivity; |
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import android.support.v7.widget.Toolbar; |
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import android.view.Menu; |
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import android.view.MenuItem; |
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import android.view.Window; |
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import android.view.WindowManager; |
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import android.widget.Button; |
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import android.widget.EditText; |
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import android.widget.TextView; |
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import android.widget.Toast; |
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import java.io.BufferedWriter; |
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import java.io.File; |
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import java.io.FileInputStream; |
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import java.io.FileOutputStream; |
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import java.io.FileWriter; |
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import java.io.IOException; |
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import java.security.InvalidKeyException; |
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import java.security.NoSuchAlgorithmException; |
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import javax.crypto.BadPaddingException; |
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import javax.crypto.Cipher; |
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import javax.crypto.CipherInputStream; |
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import javax.crypto.CipherOutputStream; |
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import javax.crypto.IllegalBlockSizeException; |
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import javax.crypto.NoSuchPaddingException; |
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import javax.crypto.spec.SecretKeySpec; |
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public class Nav_AES_Android extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, View.OnClickListener { |
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EditText input_aes, file_name; |
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Button btn_aes_enc, btn_aes_dec, btn_write_file; |
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TextView result_aes, dec_Txt; |
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String output= ""; |
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String plainText; |
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AboutAesDialog aboutAesDialog; |
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@Override |
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protected void onCreate(Bundle savedInstanceState) { |
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super.onCreate(savedInstanceState); |
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setContentView(R.layout.activity_nav__aes__android); |
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Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); |
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setSupportActionBar(toolbar); |
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Window window = getWindow(); |
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window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS); |
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window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS); |
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { |
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window.setStatusBarColor(getResources().getColor(android.R.color.holo_blue_light)); |
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} |
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input_aes = (EditText) findViewById(R.id.txtInput); |
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file_name = (EditText) findViewById(R.id.txtFileName); |
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btn_aes_enc = (Button) findViewById(R.id.btnEncrypt); |
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btn_aes_enc.setOnClickListener(this); |
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btn_aes_dec = (Button) findViewById(R.id.btnDecrypt); |
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btn_aes_dec.setOnClickListener(this); |
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btn_write_file = (Button) findViewById(R.id.btnSaveEncryptFile); |
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btn_write_file.setOnClickListener(this); |
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result_aes = (TextView) findViewById(R.id.txtOutput); |
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dec_Txt = (TextView) findViewById(R.id.txtOriginal); |
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DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); |
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ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); |
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drawer.setDrawerListener(toggle); |
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toggle.syncState(); |
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NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); |
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navigationView.setNavigationItemSelectedListener(this); |
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} |
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@Override |
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public void onBackPressed() { |
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DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); |
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if (drawer.isDrawerOpen(GravityCompat.START)) { |
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drawer.closeDrawer(GravityCompat.START); |
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} else { |
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super.onBackPressed(); |
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} |
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} |
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@Override |
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public boolean onCreateOptionsMenu(Menu menu) { |
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// Inflate the menu; this adds items to the action bar if it is present. |
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getMenuInflater().inflate(R.menu.nav__aes__android, menu); |
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return true; |
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} |
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@Override |
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public boolean onOptionsItemSelected(MenuItem item) { |
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// Handle action bar item clicks here. The action bar will |
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// automatically handle clicks on the Home/Up button, so long |
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// as you specify a parent activity in AndroidManifest.xml. |
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int id = item.getItemId(); |
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//noinspection SimplifiableIfStatement |
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if (id == R.id.action_exit) { |
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System.exit(0); |
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return true; |
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} |
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return super.onOptionsItemSelected(item); |
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} |
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@SuppressWarnings("StatementWithEmptyBody") |
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@Override |
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public boolean onNavigationItemSelected(MenuItem item) { |
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// Handle navigation view item clicks here. |
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int id = item.getItemId(); |
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if (id == R.id.nav_home) { |
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// Handle the camera action |
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}else if (id == R.id.nav_blog) { |
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dbBlog(); |
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} else if (id == R.id.nav_about) { |
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About(); |
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} else if (id == R.id.nav_exit) { |
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System.exit(0); |
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} |
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DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); |
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drawer.closeDrawer(GravityCompat.START); |
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return true; |
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} |
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private void About() { |
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aboutAesDialog = new AboutAesDialog(this); |
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aboutAesDialog.show(); |
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aboutAesDialog.setCanceledOnTouchOutside(false); |
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} |
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private void dbBlog() { |
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} |
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@Override |
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public void onClick(View view) { |
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switch (view.getId()){ |
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case R.id.btnEncrypt: |
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String strInput = input_aes.getText().toString(); |
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if (strInput.trim().equals("")) { |
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Toast.makeText(getApplicationContext(), "Input must not be blank!", Toast.LENGTH_SHORT).show(); |
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return; |
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} |
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else{ |
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Encryption(); |
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} |
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break; |
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case R.id.btnDecrypt: |
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Decryption(); |
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break; |
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case R.id.btnSaveEncryptFile: |
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try { |
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String strName = file_name.getText().toString(); |
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if (strName.trim().equals("")) { |
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Toast.makeText(getApplicationContext(), "File name is required!", Toast.LENGTH_SHORT).show(); |
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return; |
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} |
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else{ |
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if(strName.matches("^[a-zA-Z0-9_+-]*$")){ |
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String data = input_aes.getText().toString(); |
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writeToFile(data); |
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return; |
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} |
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Toast.makeText(getApplicationContext(), "File name should contain only a-z A-Z 0-9 +-_ and no spaces.", Toast.LENGTH_SHORT).show(); |
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} |
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} catch (IOException | NoSuchPaddingException | NoSuchAlgorithmException | InvalidKeyException e) { |
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e.printStackTrace(); |
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} |
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break; |
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} |
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} |
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private void writeToFile(String data) throws IOException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException { |
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File dir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/AES-Android-Example"); |
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dir.mkdir(); |
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File newFrm = new File(dir + File.separator); |
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File file = new File(newFrm, file_name.getText() +".txt"); |
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try { |
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BufferedWriter bw = new BufferedWriter(new FileWriter(file)); |
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bw.write(data); |
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bw.close(); |
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} catch (Exception e) { |
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e.printStackTrace(); |
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} |
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File outfile = new File(file+".enc.txt"); |
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FileInputStream fis = new FileInputStream(file); |
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FileOutputStream fos = new FileOutputStream(outfile); |
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Cipher encipher = Cipher.getInstance("AES"); |
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SecretKeySpec sks = new SecretKeySpec("MyDifficultPassw".getBytes(), "AES"); |
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encipher.init(Cipher.ENCRYPT_MODE, sks); |
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CipherInputStream cis = new CipherInputStream(fis, encipher); |
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CipherOutputStream cos = new CipherOutputStream(fos, encipher); |
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byte[] bArr = new byte[8]; |
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Toast.makeText(getApplicationContext(), "File is Ecrypted and Saved!", Toast.LENGTH_SHORT).show(); |
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while (true) { |
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int read = fis.read(bArr); |
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if (read != -1) { |
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cos.write(bArr, 0, read); |
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} else { |
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cos.close(); |
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fis.close(); |
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return; |
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} |
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} |
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} |
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private void Decryption() { |
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try { |
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Cipher decipher = Cipher.getInstance("AES"); |
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SecretKeySpec sks = new SecretKeySpec("MyDifficultPassw".getBytes(), "AES"); |
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decipher.init(Cipher.DECRYPT_MODE, sks); |
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byte[] decodedValue = Base64.decode(output.getBytes(), Base64.DEFAULT); |
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byte[] decryptedVal = decipher.doFinal(decodedValue); // Finish |
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output = new String(decryptedVal); |
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dec_Txt.setText(output); |
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} catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | BadPaddingException | IllegalBlockSizeException e) { |
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e.printStackTrace(); |
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} |
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} |
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private void Encryption() { |
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try { |
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plainText = input_aes.getText().toString(); |
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Cipher encipher = Cipher.getInstance("AES"); |
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SecretKeySpec sks = new SecretKeySpec("MyDifficultPassw".getBytes(), "AES"); |
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encipher.init(Cipher.ENCRYPT_MODE, sks); |
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byte[] results = encipher.doFinal(plainText.getBytes("UTF-8")); |
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output = Base64.encodeToString(results, Base64.DEFAULT); |
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result_aes.setText(output); |
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} catch (Exception e) { |
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// TODO Auto-generated catch block |
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e.printStackTrace(); |
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} |
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} |
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} |
