安卓rc4加密

Question

我想我遗漏了一些东西，我相信图像(转换成字节)在到达客户端时是加密的，但没有解密。该图像似乎通过了RSA签名验证，但不知何故无法查看。

客户端代码：

    public void aliceEncrypt(byte[] plaintext, byte[] sharedSecret) {

    Cipher cipher;
    byte[] encrypted = null;
    try {
        cipher = Cipher.getInstance("RC4");
        Key sk = new SecretKeySpec(sharedSecret, "RC4");
        cipher.init(Cipher.ENCRYPT_MODE, sk);
        encrypted = cipher.doFinal(plaintext);
        CipherOutputStream cos = new CipherOutputStream(socket.getOutputStream(), cipher);
        ObjectOutputStream oos = new ObjectOutputStream(cos);
        oos.writeObject(encrypted);
        oos.flush();

    } catch (NoSuchAlgorithmException | NoSuchPaddingException | IOException | InvalidKeyException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    }
}

服务器端代码：

public byte[] bobDecrypt( byte[] sharedSecret) {


    Cipher cipher = null;
    byte[] bytes = null;
    byte[] decrypted = null;
    try {
        cipher = Cipher.getInstance("RC4");
        Key sk = new SecretKeySpec(sharedSecret, "RC4");
        cipher.init(Cipher.DECRYPT_MODE, sk);
        CipherInputStream cis = new CipherInputStream(socket.getInputStream(), cipher);
        ObjectInputStream ois = new ObjectInputStream(cis);
        bytes =  (byte[])ois.readObject();
        decrypted = cipher.doFinal(bytes);

    } catch (NoSuchAlgorithmException | NoSuchPaddingException | IOException | InvalidKeyException | ClassNotFoundException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    }
    return decrypted;
}