AES / GCM / NoPadding解密需要TAG加密时如何查找标签

如何解决AES / GCM / NoPadding解密需要TAG加密时如何查找标签

这是我的加密方法，也是解密方法，它可以与Tag正常工作基本上服务器需要TAG，服务器是否有可能通过我的十六进制字符串找到Tag，因为我发送给服务器的每个字符串以及Hex都具有其他最佳值，解决方案

aesKey=context.getString(R.string.aes_key).getBytes();
iv=context.getString(R.string.input_vector).getBytes();


public Map encrypt(String string){
    byte[] plainText= new byte[0];
    try {
        plainText = string.getBytes("UTF-8");
    } catch (UnsupportedEncodingException e) {
        e.printstacktrace();
    }

    Cipher cipher = null;
    try {
        cipher = Cipher.getInstance("AES/GCM/nopadding");
    } catch (NoSuchAlgorithmException e) {
        e.printstacktrace();
    } catch (NoSuchPaddingException e) {
        e.printstacktrace();
    }
    try {
        cipher.init(Cipher.ENCRYPT_MODE,new SecretKeySpec(aesKey,"AES"),new IvParameterSpec(iv));
    } catch (InvalidAlgorithmParameterException e) {
        e.printstacktrace();
    } catch (InvalidKeyException e) {
        e.printstacktrace();
    }
    byte[] cipherText = new byte[0];
    byte[] tag = new byte[0];
    try {

        cipherText = cipher.doFinal(plainText);
        tag= Arrays.copyOfRange(cipherText,cipherText.length -16,cipherText.length);
        cipherText= Arrays.copyOfRange(cipherText,cipherText.length -16);

        Log.d("testing","encrypt: "+byteArrayToHexString(tag));
        Map<String,Object> map=new HashMap();
        map.put("content",byteArrayToHexString(cipherText));
        map.put("tag",tag);
        Log.d("testing","encrypt: "+new Gson().toJson(map));
        return map;
    } catch (BadPaddingException e) {
        e.printstacktrace();
    } catch (IllegalBlockSizeException e) {
        e.printstacktrace();
    }

    return new HashMap();
}

服务器需要十六进制，所以我将其转换为十六进制

public  String byteArrayToHexString(final byte[] bytes) {
    StringBuilder sb = new StringBuilder();
    for(byte b : bytes){
        sb.append(String.format("%02x",b&0xff));
    }
    return sb.toString();
}

我的解密功能是返回我从服务器接收到的标签和十六进制字符串的字符串

    public String decrypt(String content,byte[] tag){


    byte[] cipherText = hexStringToByteArray(content+byteArrayToHexString(tag));


    Cipher cipher = null;
    try {
        cipher = Cipher.getInstance("AES/GCM/nopadding");
    } catch (NoSuchAlgorithmException e) {
        e.printstacktrace();
    } catch (NoSuchPaddingException e) {
        e.printstacktrace();
    }
    try {
        cipher.init(Cipher.DECRYPT_MODE,new IvParameterSpec(iv));
    } catch (InvalidKeyException e) {
        e.printstacktrace();
    } catch (Exception e) {
        e.printstacktrace();
    }
    byte[] plainText = new byte[0];
    try {
        plainText = cipher.doFinal(cipherText);
    } catch (BadPaddingException e) {
        e.printstacktrace();
    } catch (IllegalBlockSizeException e) {
        e.printstacktrace();
    }
    try {
        Log.d("testing","encrypt: plain text:"+new String(plainText,"UTF-8"));
        return new String(plainText,"UTF-8");
    } catch (UnsupportedEncodingException e) {
        e.printstacktrace();
    }

    return null;
}