一次性密码OTPC＃到Java的Code转换

问题描述

|| 去年，我在C＃中编写了一次性密码（OTP）生成器。现在，我需要在Java中使用OTP生成器，但是在Java中找不到等效的函数。 这是我去年编写的代码：（我知道此OTP的安全性很低，但我不需要防弹的代码）

SHA1CryptoServiceProvider hash = new SHA1CryptoServiceProvider(); //first hash with sha1
byte[] hashPass = hash.ComputeHash(Encoding.ASCII.GetBytes(pass)); //pass is entered by user
HMACMD5 hma = new HMACMD5(hashPass); // use the hashed value as a key to hmac
OTPass = hma.ComputeHash(Encoding.ASCII.GetBytes(email + Counter(email)));// generate OTPass,Counter(email) is the counter of the user taken from database
increaseCounter(email); // updating the counter
this.SetLog(this.GetLog() + Environment.NewLine + \"OTPass Generated: \" + BitConverter.ToString(OTPass)); // OTP

这是我尝试将C＃转换为的Java代码：（这只是SHA1部分，我找不到如何用Java编写HMAC-MD5）

import java.io.*;
import java.security.*;

public class otp {

/**
 * @param args
 * @throws IOException 
 */
public static void main(String[] args) throws IOException {

    System.out.println(\"Please enter your username:\");
    BufferedReader br = new BufferedReader(new InputStreamReader(system.in));
    String username = br.readLine();
    System.out.println(\"Please enter your password:\");
    String password = br.readLine();

    try {
         MessageDigest md = MessageDigest.getInstance(\"SHA1\");

         String input = password;
         md.update(input.getBytes()); 
         byte[] output = md.digest();
         System.out.println();
         System.out.println(\"SHA1(\\\"\"+input+\"\\\") =\");
         System.out.println(\"   \"+bytesToHex(output));


      } catch (Exception e) {
         System.out.println(\"Exception: \"+e);
      }
   }
   public static String bytesToHex(byte[] b) {
      char hexDigit[] = {\'0\',\'1\',\'2\',\'3\',\'4\',\'5\',\'6\',\'7\',\'8\',\'9\',\'A\',\'B\',\'C\',\'D\',\'E\',\'F\'};
      StringBuffer buf = new StringBuffer();
      for (int j=0; j<b.length; j++) {
         buf.append(hexDigit[(b[j] >> 4) & 0x0f]);
         buf.append(hexDigit[b[j] & 0x0f]);
      }
      return buf.toString();        
}
}

感谢帮助     

解决方法

        我一直用BouncyCastle 您可以查看以下几页： 弹力城堡HMac BouncyCastle规格 还是坚持使用Java 6：

Mac hmacMd5 = Mac.getInstance(\"HMACMD5\");