Android中的md5加密怎么与php md5加密保持一致

import java.math.BigInteger;  import java.security.MessageDigest;  import java.security.NoSuchAlgorithmException;  public class MD5 {  //密码加密 与php加密一致  public static String md5(String input) throws NoSuchAlgorithmException {  String result = input;  if(input != null) {  MessageDigest md = MessageDigest.getInstance("MD5"); //or "SHA-1"  md.update(input.getBytes());  BigInteger hash = new BigInteger(1, md.digest());  result = hash.toString(16);  while(result.length() < 32) { //31位string  result = "0" + result;  }  }  return result;  }  }