C# MD5-16位加密執行個體,32位加密執行個體(兩種方法))

1.MD5　16位加密執行個體
using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;

namespace md5
{
    class Program
    {
        static void Main(string[] args)
        {
             Console.WriteLine(UserMd5("8"));
             Console.WriteLine(GetMd5Str("8"));
         }
        /// <summary>
        /// MD5 16位加密 加密後密碼為大寫
        /// </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 16位加密 加密後密碼為小寫
        /// </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　32位加密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
       static  string UserMd5(string str)
        {
            string cl = str;
            string pwd = "";
             MD5 md5 = MD5.Create();//執行個體化一個md5對像
            // 加密後是一個位元組類型的數組，這裡要注意編碼UTF8/Unicode等的選擇　
            byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(cl));
            // 通過使用迴圈，將位元組類型的數群組轉換為字串，此字串是常規字元格式設定化所得
            for (int i = 0; i < s.Length; i++)
            {
                // 將得到的字串使用十六進位類型格式。格式後的字元是小寫字母，如果使用大寫（X）則格式後的字元是大寫字元

                 pwd = pwd + s[i].ToString("X");
                
             }
            return pwd;
         }
     }
}

using System.Security.Cryptography;
using System.Text;

public static string StringToMD5Hash(string inputString)
        {
            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
            byte[] encryptedBytes = md5.ComputeHash(Encoding.ASCII.GetBytes(inputString));
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < encryptedBytes.Length; i++)
            {
                sb.AppendFormat("{0:x2}", encryptedBytes[i]);
            }
            return sb.ToString();
        }