Encryption of image files on Android -- Cipher(Output|Input)Stream problems
<p>I'm trying to encrypt image files on Android with password based encryption. To save the encrypted image I just do this:</p>

<pre><code>FileOutputStream fos = new FileOutputStream(thumbnailFile);
CipherOutputStream cos = new CipherOutputStream(fos, encryptCipher);
Bitmap thumbnail = Bitmap.createScaledBitmap(bm2, 140, 140, true);
thumbnail.compress(Bitmap.CompressFormat.JPEG, 80, cos);
</code></pre>

<p>and to read it, this:</p>

<pre><code>FileInputStream fis = new FileInputStream(f);
CipherInputStream cis = new CipherInputStream(fis, decryptCipher);
Bitmap b = BitmapFactory.decodeStream(cis);
</code></pre>

<p>but the Bitmap ends up as null.  The code works when I bypass the encryption; that is when I use the File(Input|Output)Streams rather than the Cipher(Input|Output)streams.</p>

<p>My Ciphers are created as follows:</p>

<pre><code>public void initCiphers(char password[]) {

PBEKeySpec pbeKeySpec;
PBEParameterSpec pbeParamSpec;
SecretKeyFactory keyFac;

byte[] salt = {
   (byte)0xc7, (byte)0x73, (byte)0x21, (byte)0x8c,
   (byte)0x7e, (byte)0xc8, (byte)0xee, (byte)0x99
};
int count = 20;
pbeParamSpec = new PBEParameterSpec(salt, count);          
pbeKeySpec = new PBEKeySpec(password);
try {
    keyFac = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
    SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);
    encryptCipher = Cipher.getInstance("PBEWithMD5AndDES");
    decryptCipher = Cipher.getInstance("PBEWithMD5AndDES");    
    encryptCipher.init(Cipher.ENCRYPT_MODE, pbeKey, pbeParamSpec);
    decryptCipher.init(Cipher.DECRYPT_MODE, pbeKey, pbeParamSpec);       
} catch (Exception e) { 
    Log.v("tag", e.toString()); 
}
</code></pre>

<p>I don't get any exceptions.</p>

<p>There is obviously some problem with using Cipher(Output|Input)Streams with the android functions for encoding and/or decoding images, but since those functions are opaque and there are no exceptions, its hard to know what it is. I suspect it has to do with padding or flushing. Any assistance would be gratefully appreciated.</p>
