Nur das verschlüsselte Bild sollte in der Datei gespeichert und das Bild zur Vorschau entschlüsselt werden

Question

In Diese Codedatei speichert das Originalbild, das verschlüsselte Bild und das entschlüsselte Bild.

Ich habe zwei Probleme, dass:

1. nur verschlüsseltes Bild in der Datei gespeichert werden soll (savedimages)

2. Das verschlüsselte Bild direkt an byteArray oder etwas entschlüsselt werden soll, die als festgelegt werden können Bitmap in Bildansicht. Derzeit nimmt es direkt aus der Datei.

Gibt es eine Möglichkeit, dies zu erreichen, oder sollte ich

public Main3Activity() { 
    try { 
     // SecureRandom sr = SecureRandom.getInstance("SHA1PRNG","Crypto"); 

     keyGenerator = KeyGenerator.getInstance("Blowfish"); 
     secretKey = keyGenerator.generateKey(); 
     cipher = Cipher.getInstance("Blowfish"); 
    } catch (NoSuchPaddingException ex) { 
     System.out.println(ex); 
    } catch (NoSuchAlgorithmException ex) { 
     System.out.println(ex); 
    } 
} 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main3); 


    ActivityCompat.requestPermissions(this, new String[]{ACCESS_FINE_LOCATION, CAMERA, WRITE_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE); 
    v1=(ImageView)findViewById(R.id.imageViewnew); 
    b1=(Button)findViewById(R.id.cameranew); 

    final String imagePath = "image" + ".png"; 
    File root = new File(Environment.getExternalStorageDirectory() + File.separator + "savedimages"); 
    root.mkdirs(); 
    if (!root.exists()) { 
     root.mkdir(); 
    } 

    file = new File(Environment.getExternalStorageDirectory() + File.separator + "savedimages",imagePath); 
    file1 = new File(Environment.getExternalStorageDirectory() + File.separator + "savedimages","Encryp"+imagePath); 
    file2 = new File(Environment.getExternalStorageDirectory() + File.separator + "savedimages","decryp"+imagePath); 

    b1.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
      outputFileUri = Uri.fromFile(file); 
      intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri); 
      startActivityForResult(intent, CAMERA_REQUEST); 

     } 
    }); 
} 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) { 


     OutputStream outStream = null; 
     InputStream inStream = null; 
     try { 

      System.out.println("Encryption Over"); 
      cipher.init(Cipher.ENCRYPT_MODE, secretKey); 
      inStream = new FileInputStream(file); 
      outStream = new FileOutputStream(file1); 
      byte[] buffer = new byte[1024]; 
      int len; 

      while ((len = inStream.read(buffer)) > 0) { 
       outStream.write(cipher.update(buffer, 0, len)); 
       outStream.flush(); 
      } 
      outStream.write(cipher.doFinal()); 
      outStream.close(); 
     } catch (IllegalBlockSizeException ex) { 
      System.out.println(ex); 
     } catch (BadPaddingException ex) { 
      System.out.println(ex); 
     } catch (InvalidKeyException ex) { 
      System.out.println(ex); 
     } catch (FileNotFoundException ex) { 
      System.out.println(ex); 
     } catch (IOException ex) { 
      System.out.println(ex); 
     } 


     try { 
      System.out.println("Decryption Over"); 

      cipher.init(Cipher.DECRYPT_MODE, secretKey); 
      inStream = new FileInputStream(file1); 
      outStream = new FileOutputStream(file2); 
      byte[] buffer = new byte[1024]; 
      int len; 

      while ((len = inStream.read(buffer)) > 0) 
      { 
      //------------>>>>>>>>> Here Image is Storing instead of that it should read as byte array 
       // ------------>>>>>>>>>> and read as bitmap and set in Imageview for preview 

       outStream.write(cipher.update(buffer, 0, len)); 
       outStream.flush(); 
      } 
      System.out.print("Decryption ovverrr"); 
      outStream.write(cipher.doFinal()); 
      inStream.close(); 
      outStream.close(); 
     } catch (IllegalBlockSizeException ex) { 
      System.out.println(ex); 
     } catch (BadPaddingException ex) { 
      System.out.println(ex); 
     } catch (InvalidKeyException ex) { 
      System.out.println(ex); 
     } catch (FileNotFoundException ex) { 
      System.out.println(ex); 
     } catch (IOException ex) { 
      System.out.println(ex); 
     } catch (Exception ex) { 
      System.out.println(ex); 
     } 


     BitmapFactory.Options options=new BitmapFactory.Options(); 
     final Bitmap b=BitmapFactory.decodeFile(file2.toString(),options); 
     System.out.println("Image getting from File"); 

     //----------->>>>>>>>>> Decrypted Image should view Here. Currently I am getting directly from file. 
     v1.setImageBitmap(b); 

    } 
} 
} 

Answer 1

Verwendung this Bibliothek Ich habe die Lösung für meine Frage gefunden. Dies könnte für jemanden hilfreich sein.

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main3); 

    v1=(ImageView)findViewById(R.id.imageViewnew); 
    v2=(ImageView)findViewById(R.id.imageViewupdate); 
    b1=(Button)findViewById(R.id.cameranew); 
    b2=(Button)findViewById(R.id.cameraupp); 


    String IVX = "abcdefghijklmnop"; // 16 lenght - not secret 
    String SECRET_KEY = "secret1234567890"; // 16 lenght - secret 

    SimpleStorageConfiguration configuration = new SimpleStorageConfiguration.Builder() 
      .setEncryptContent(IVX, SECRET_KEY) 
      .build(); 

    if (SimpleStorage.isExternalStorageWritable()) { 
     storage = SimpleStorage.getExternalStorage(); 
    } 
    else { 
     storage = SimpleStorage.getInternalStorage(getApplicationContext()); 
    } 

    SimpleStorage.updateConfiguration(configuration); 

    imagePath = "image" + ".png"; 
    boolean dirExists = storage.isDirectoryExists("savedimages"); 

    if(dirExists==true) 
    { 
     System.out.println("Directoy Already Created"); 
    } 
    else { 
     storage.createDirectory("savedimages", true); 
    } 

    boolean fileExists = storage.isFileExist("savedimages",imagePath); 

    if(fileExists==true) { 
     System.out.println("File Already Created"); 
    } 
    else { 
     storage.createFile("savedimages", imagePath, " "); 
    } 

    ff=storage.getFile("savedimages",imagePath); 

    b1.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
      outputFileUri = Uri.fromFile(ff); 
      intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri); 
      startActivityForResult(intent, CAMERA_REQUEST); 

     } 
    }); 
} 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) { 

     BitmapFactory.Options options=new BitmapFactory.Options(); 
     final Bitmap b=BitmapFactory.decodeFile(ff.toString(),options); 
     v2.setImageBitmap(b); 

     storage.createFile("savedimages",imagePath,b); 

    } 
}} 

Answer 2

Diese library bietet Verschlüsselung irgendwann einige andere Methoden versuchen, aber ich nicht überprüfen, was vielleicht Art von Verschlüsselung werde es sei genug für dich. Es ist einfacher, dann die Java-Dateiklasse zu verwenden.