C# Md5Hash的用法及实例-C#.Net教程

/// <summary>        /// MD5　32位加密(大写)        /// </summary>        /// <param name="str"></param>        /// <returns></returns>        static string UserMd5(string str)        {            string cl = str;            string pwd = "";            MD5 md5 = MD5.Create();//实例化一个md5对像            // 加密后是一个字节类型的数组，这里要注意编码UTF8/Unicode等的选择　            byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(cl));            // 通过使用循环，将字节类型的数组转换为字符串，此字符串是常规字符格式化所得            for (int i = 0; i < s.Length; i++)            {                // 将得到的字符串使用十六进制类型格式。格式后的字符是小写的字母，如果使用大写（X）则格式后的字符是大写字符                 pwd = pwd + s[i].ToString("X");            }            return pwd;        }        /// <summary>        /// MD5 16位加密 加密后密码为小写        /// </summary>        /// <param name="ConvertString"></param>        /// <returns></returns>        public static string GetMd5str(string ConvertString)        {            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();            string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);            t2 = t2.Replace("-", "");            t2 = t2.ToLower();            return t2;        }        /// <summary>        /// MD5 16位加密 加密后密码为大写        /// </summary>        /// <param name="ConvertString"></param>        /// <returns></returns>        public static string GetMd5Str(string ConvertString)        {            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();            string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);            t2 = t2.Replace("-", "");            return t2;        }        /// <summary>        /// MD5加密(小写)        /// </summary>        /// <param name="input"></param>        /// <returns></returns>        private static string Md5Hash(string input)        {            MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();            byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(input));            StringBuilder sBuilder = new StringBuilder();            for (int i = 0; i < data.Length; i++)            {                sBuilder.Append(data[i].ToString("x2"));            }            return sBuilder.ToString();        }