last block incomplete with CipherInputStream/CipherOutputStream, even with padding AES/CBC/PKCS5Padding

Question

Actually, I searched lot from internet and in stackoverflow too for this,

Initially I don\'t used padding in my encryption and decryption,

But Finally I got

Answer 1

For those who are struggling with aes encryption / decryption with image file, here is my example, and it works like a charm.

public static String decrypt(String textToDecrypt)  {
    byte[] dataDecrypted = null;

    try {
        Cipher cipher = getCipher();
        SecretKey key = getKey();
        IvParameterSpec iv = getIV();
        if(cipher == null) {
            return null;
        }
        cipher.init(Cipher.DECRYPT_MODE, key, iv);

        byte[] dataToDecrypt = Base64.decode(textToDecrypt, Base64.NO_WRAP);
        ByteArrayInputStream bais = new ByteArrayInputStream(dataToDecrypt);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        // Wrap the output stream
        CipherOutputStream cos = new CipherOutputStream(baos, cipher);

        // Read bytes
        int count = 0;
        byte[] buffer = new byte[DEFAULT_BYTE_READ_WRITE_BLOCK_BUFFER_SIZE];
        while ((count = bais.read(buffer)) != -1) {
            cos.write(buffer, 0, count);
        }
        cos.close();    // manually do close for the last bit

        dataDecrypted = baos.toByteArray();

        // Close streams.
        baos.close();
        bais.close();
    } catch (Exception e) {
        e.printStackTrace();
    }

    return (dataDecrypted == null ? "" : Base64.encodeToString(dataDecrypted, Base64.NO_WRAP));
}

---

public static String encrypt(String textToEncrypt) {
    byte[] dataEncrypted = null;

    try {
        Cipher cipher = getCipher();
        SecretKey key = getKey();
        IvParameterSpec iv = getIV();
        if (cipher == null) {
            return null;
        }
        cipher.init(Cipher.ENCRYPT_MODE, key, iv);

        byte[] dataToEncrypt = Base64.decode(textToEncrypt, Base64.NO_WRAP);
        ByteArrayInputStream bais = new ByteArrayInputStream(dataToEncrypt);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        // Wrap the output stream
        CipherOutputStream cos = new CipherOutputStream(baos, cipher);

        // Read bytes
        int count = 0;
        byte[] buffer = new byte[DEFAULT_BYTE_READ_WRITE_BLOCK_BUFFER_SIZE];
        while ((count = bais.read(buffer)) != -1) {
            cos.write(buffer, 0, count);
        }
        cos.close();    // manually do close for the last bit

        dataEncrypted = baos.toByteArray();

        // Close streams.
        baos.close();
        bais.close();
    } catch (Exception e) {
        e.printStackTrace();
    }

    return (dataEncrypted == null ? "" : Base64.encodeToString(dataEncrypted, Base64.NO_WRAP));
}