C#加密-MD5

      /// <summary>
        /// 根据指定字符串计算MD5数值的16进制字符串
        /// </summary>
        /// <param name="strData">字符串数据</param>
        /// <returns>大写的MD5的16进制字符串</returns>
        public static string GetMD5String(string strData)
        {
            System.Security.Cryptography.MD5CryptoServiceProvider myMD5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
            byte[] bytBuf = System.Text.Encoding.Unicode.GetBytes(strData);
            byte[] md5 = myMD5.ComputeHash(bytBuf, 0, bytBuf.Length);
            return ByteToHex(md5);
        }
        /// <summary>
        /// 将一个字节数值转换为一个16进制字符串
        /// </summary>
        /// <param name="bytBuf">字节数组</param>
        /// <returns>16进制字符串</returns>
        public static string ByteToHex(byte[] bytBuf)
        {
            System.Text.StringBuilder myStr = new System.Text.StringBuilder();
            for (int iCount = 0; iCount < bytBuf.Length; iCount++)
            {
                myStr.Append(bytBuf[iCount].ToString("X2"));
            }
            return myStr.ToString();
        }

        /// <summary>
        /// 16位MD5加密（16位实际上是从32位字符串中，取中间的第9位到第24位的部分）
        /// </summary>
        /// <param name="password"></param>
        /// <returns></returns>
        public static string MD5Encrypt16(string password)
        {
            var md5 = new MD5CryptoServiceProvider();
            string t2 = BitConverter.ToString(md5.ComputeHash(Encoding.Default.GetBytes(password)), 4, 8);
            t2 = t2.Replace("-", "");
            return t2;
        }
        /// <summary>
        /// 32位MD5加密
        /// </summary>
        /// <param name="password"></param>
        /// <returns></returns>
        public static string MD5Encrypt32(string password)
        {
            string cl = password;
            string pwd = "";
            MD5 md5 = MD5.Create();
            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("X2");
            }
            return pwd;
        }
        /// <summary>
        /// 64位的MD5加密
        /// </summary>
        /// <param name="password"></param>
        /// <returns></returns>
        public static string MD5Encrypt64(string password)
        {
            MD5 md5 = MD5.Create();
            byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(password));
            return Convert.ToBase64String(s);
        }