java密码加密

package com.sunnylocus.util;   
  
import java.security.MessageDigest;   
  
/**   
 * 对密码进行加密和验证的类  
 */  
public class CipherUtil{   
       
    //十六进制下数字到字符的映射数组   
    private final static String[] hexDigits = {"0", "1", "2", "3", "4",   
        "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};   
       
    /** * 把inputString加密     */  
    public static String generatePassword(String inputString){   
        return encodeByMD5(inputString);   
    }   
       
      /**  
       * 验证输入的密码是否正确  
     * @param password    加密后的密码  
     * @param inputString    输入的字符串  
     * @return    验证结果，TRUE:正确 FALSE:错误  
     */  
    public static boolean validatePassword(String password, String inputString){   
        if(password.equals(encodeByMD5(inputString))){   
            return true;   
        } else{   
            return false;   
        }   

    }   
    /**  对字符串进行MD5加密     */  
    private static String encodeByMD5(String originString){   
        if (originString != null){   
            try{   
                //创建具有指定算法名称的信息摘要   
                MessageDigest md = MessageDigest.getInstance("MD5");   
                //使用指定的字节数组对摘要进行最后更新，然后完成摘要计算   
                byte[] results = md.digest(originString.getBytes());   
                //将得到的字节数组变成字符串返回   
                String resultString = byteArrayToHexString(results);   
                return resultString.toUpperCase();   
            } catch(Exception ex){   
                ex.printStackTrace();   
            }   
        }   
        return null;   
    }   
       
    /**   
     * 转换字节数组为十六进制字符串  
     * @param     字节数组  
     * @return    十六进制字符串  
     */  
    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();