How to Encrypt And decrypt UTF-8 in JAVA or Android?

问题

I use This Algorithm for Encrypt and Decrypt data in android. But when use utf-8 charater ..this error is displayed : [encrypt] data not block size aligned.

I use this Algorithm for Encrypt and Decrypt : https://snipt.net/raw/ee573b6957b7416f28aa560ead71c3a2/?nice

my code:

HttpClient client = new DefaultHttpClient();

        HttpPost post = new HttpPost(ServerIP.frooshgah_URL);
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
        JSONObject json = new JSONObject();



        try {
            json.put("UserId", "0s");
            json.put("N_frooshgah", N_frooshgah);
            json.put("N_masol", N_masol);
            json.put("N_makan", N_makan);
            json.put("address", address);
            json.put("tel", tel);
            json.put("time_baz", time_baz);
            json.put("time_baste", time_baste);
            json.put("tavzihat", tavzihat);
            json.put("tag", tag);
            json.put("categori", "پوشاک");
            json.put("city", city);
            json.put("lat", lat);
            json.put("long", Long);

        } catch (JSONException e3) {
            // TODO Auto-generated catch block
            e3.printStackTrace();
        }

        MCrypt mcrypt = new MCrypt();
        String encrypted = "";
        try {

            encrypted = MCrypt.bytesToHex(mcrypt.encrypt(json.toString()));
            //encrypted = encryption.hexToString(json.toString(), 2);
              //key = UUID.randomUUID().toString().replaceAll("-", "");
            //encrypted=Crypto.encrypt(json.toString(),key);


        } catch (Exception e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

How to Resolve this Problem?

thanks

回答1:

First of all, I see the MCrypt class your using provides source code. Download the source code and add it to your project and modify the padString(string) method to this:

private static String padString(String source){
  char paddingChar = ' ';
  int size = 16;
  int x = source.getBytes(Charset.forName("UTF-8")).length % size;
  int padLength = size - x;

  for (int i = 0; i < padLength; i++)
  {
          source += paddingChar;
  }

  return source;
}

This will allow the code to execute while using UTF-8 as a charset. If you want to "improve" the library to support mutliple charsets, consider adding a charset parameter into the encrypt/decrypt methods of the class.

来源：https://stackoverflow.com/questions/18279818/how-to-encrypt-and-decrypt-utf-8-in-java-or-android