一次性密码（OTP）C＃到Java的Code转换

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

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();        
}
}