C#下Base64、MD5、AES加密

using System;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
			
            string s="abcdef1234567890";

            try
            {
                Console.WriteLine("Base64加密");
				string key = System.Convert.ToBase64String(System.Text.Encoding.Default.GetBytes(s));
                Console.WriteLine(key);
                Console.WriteLine();
                Console.WriteLine("Base64解码");
				string enkey = System.Text.Encoding.Default.GetString(System.Convert.FromBase64String(key));
                Console.WriteLine(enkey);
                Console.WriteLine();
            }catch(Exception e){
            }

            MD5 md5Hash = MD5.Create();
            
            string hash = GetMd5Hash(md5Hash, s);
            Console.WriteLine("The MD5 hash of " + s + " is:\n" + hash + ".");
            Console.WriteLine();

            Console.WriteLine("AES加密");
            Console.WriteLine(Encrypt(s));
            Console.WriteLine();

            Console.WriteLine("AES解密");
            Console.WriteLine(Decrypt(Encrypt(s)));

            Console.ReadKey();
        }
		//MD5加密
        static string GetMd5Hash(MD5 md5Hash, string input)
        {

            byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(input));

            StringBuilder sBuilder = new StringBuilder();

            for (int i = 0; i < data.Length; i++)
            {
                sBuilder.Append(data[i].ToString("x2"));
            }

            return sBuilder.ToString();
        }
        // AES-256 加密
        public static string Encrypt(string toEncrypt)
        {
            // 256-AES key    
            byte[] keyArray = UTF8Encoding.UTF8.GetBytes("12345678901234567890123456789012");
            byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);

            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = CipherMode.ECB;
            rDel.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = rDel.CreateEncryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }
        //AES-256 解密
        public static string Decrypt(string toDecrypt)
        {
            // 256-AES key    
            byte[] keyArray = UTF8Encoding.UTF8.GetBytes("12345678901234567890123456789012");
            byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);

            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = CipherMode.ECB;
            rDel.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = rDel.CreateDecryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            return UTF8Encoding.UTF8.GetString(resultArray);
        }
    }
}