如何在JAVA或Android中加密和解密UTF-8？ [英] How to Encrypt And decrypt UTF-8 in JAVA or Android?

问题描述

我使用这个算法在Android中加密和解密数据。但是当使用utf-8 charater ..这个错误显示：[encrypt]数据不是块大小对齐。

我使用这个加密和解密算法： https://snipt.net/raw/ee573b6957b7416f28aa560ead71c3a2/?nice

我的代码：

  HttpClient client = new DefaultHttpClient（）; 
 
 HttpPost post = new HttpPost（ServerIP.frooshgah_URL）; 
列表< 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自动生成的catch块
 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（异常e1）{
 // TODO自动生成的catch块
 e1.printStackTrace（）; 
} 
  

如何解决这个问题？

谢谢

解决方案

首先，我看到 MCrypt class你的使用提供源代码。下载源代码并将其添加到您的项目中，并将 padString（string）方法修改为：

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

这将允许代码执行时使用 UTF -8 作为字符集。如果要改进库以支持多个字符集，请考虑将 charset 参数添加到 encrypt / decrypt 类的方法。

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

解决方案

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.

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