MD5加密方法

public static string GetMD5(string str)  //自己寫的
        {
            //創建MD5對象
            MD5 md5= MD5.Create();
            //開始加密
            //需要將字符串轉換成字節數組
            byte[] buffer = Encoding.Default.GetBytes(str);
            byte[] MD5Buffer = md5.ComputeHash(buffer);
            //將字符數組轉換成字符串
            //字符數組-------字符串
            //第一種：將字節數組中每個元素按照指定的編碼格式解析成字符串
　　　　　　　//MD5str = Encoding.Default.GetString(MD5Buffer);//此實例中無法將字符數組轉換為字符串
            //第二種：直接將數組ToString()
            //將字節數組中的每個元素ToString()
            string MD5str=string.Empty;
            for (int i = 0; i < MD5Buffer.Length; i++)
            {
                MD5str += MD5Buffer[i].ToString("x2");//轉換成32進制
            }
            return MD5str;
        }

using System;　　　　　　　　　　　　　　　　　　　　　　　　　　　　//MSDN庫的
using System.Security.Cryptography;
using System.Text;

namespace MD5Sample
{
    class Program
    {
        static void Main(string[] args)
        {
            string source = "Hello World!";
            using (MD5 md5Hash = MD5.Create())
            {
                string hash = GetMd5Hash(md5Hash, source);
                Console.WriteLine("The MD5 hash of " + source + " is: " + hash + ".");
                Console.WriteLine("Verifying the hash...");
                if (VerifyMd5Hash(md5Hash, source, hash))
                {
                    Console.WriteLine("The hashes are the same.");
                }
                else
                {
                    Console.WriteLine("The hashes are not same.");
                }
            }
        }
        static string GetMd5Hash(MD5 md5Hash, string input)
        {
            // Convert the input string to a byte array and compute the hash.
            byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(input));
            // Create a new Stringbuilder to collect the bytes
            // and create a string.
            StringBuilder sBuilder = new StringBuilder();
            // Loop through each byte of the hashed data 
            // and format each one as a hexadecimal string.
            for (int i = 0; i < data.Length; i++)
            {
                sBuilder.Append(data[i].ToString("x2"));
            }
            // Return the hexadecimal string.
            return sBuilder.ToString();
        }
        // Verify a hash against a string.
        static bool VerifyMd5Hash(MD5 md5Hash, string input, string hash)
        {
            // Hash the input.
            string hashOfInput = GetMd5Hash(md5Hash, input);
            // Create a StringComparer an compare the hashes.
            StringComparer comparer = StringComparer.OrdinalIgnoreCase;
            if (0 == comparer.Compare(hashOfInput, hash))
            {
                return true;
            }
            else
            {
                return false;
            }
        }
    }
}
// This code example produces the following output:
// The MD5 hash of Hello World! is: ed076287532e86365e841e92bfc50d8c.
// Verifying the hash...
// The hashes are the same.