using System.Security.Cryptography;

using System.Text;

namespace MD5

{

    /// <summary>

    /// MD5加密算法

    /// </summary>        

    public class MD5Encryptor

    {

        #region 9 Public Methods

        /// <summary>

        /// MD5 加密

        /// </summary>

        /// <param name=”text”>需要加密的字符串</param>

        /// <returns>加密过后的字符串</returns>

        public string Encrypt(string text)

        {

            //1、创建MD5对象

            MD5 md5 = new MD5CryptoServiceProvider();

            //2、将字符编码为一个字节序列

            byte[] data = System.Text.Encoding.Default.GetBytes(text);

            //3、计算data字节数组的哈希值

            byte[] md5data = md5.ComputeHash(data);

            //4、释放MD5对象中的所有资源

            md5.Clear();

            //5、创建字符存储器并初始化

            StringBuilder str = new StringBuilder();

            str.Append(string.Empty);

            //6、存储加密字符

            for (int i = 0; i < md5data.Length – 1; i++)

            {

                str.Append(md5data[i].ToString(“x”).PadLeft(2, ‘0’));

            }

            //7、返回经过MD5加密过后的字符串

            return str.ToString();

        }

        #endregion

    }

}