package com.winsun.utils;

import java.security.MessageDigest;

public class MD5Util
{
  private static String byteArrayToHexString(byte[] b)
  {
    StringBuffer resultSb = new StringBuffer();
    for (int i = 0; i < b.length; i++) {
      resultSb.append(byteToHexString(b[i]));
    }
    return resultSb.toString();
  }
  
  private static String byteToHexString(byte b)
  {
    int n = b;
    if (n < 0) {
      n += 256;
    }
    int d1 = n / 16;
    int d2 = n % 16;
    return hexDigits[d1] + hexDigits[d2];
  }
  
  public static String MD5Encode(String origin, String charsetname)
  {
    String resultString = null;
    try
    {
      resultString = new String(origin);
      MessageDigest md = MessageDigest.getInstance("MD5");
      if ((charsetname == null) || ("".equals(charsetname))) {
        resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
      } else {
        resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
      }
    }
    catch (Exception localException) {}
    return resultString;
  }
  
  private static final String[] hexDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", 
    "e", "f" };
}
