Base64加密解密

using System;
using System.Collections.Generic;
using System.Text;

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

namespace Hospital
{
    class ClsBase64
    {
        /// <summary>
        /// Base64加密
        /// </summary>
        /// <param name="strSource"></param>
        /// <returns></returns>
        public static string Encrypting(string strSource)
        {
            byte[] bytln = System.Text.Encoding.Default.GetBytes(strSource);
            byte[] iv = { 102, 16, 93, 156, 78, 4, 218, 32 };//定義偏移量  
            byte[] key = { 55, 103, 246, 79, 36, 99, 167, 3 };//定義密鑰  
            //實例DES加密類  
            DESCryptoServiceProvider mobjCryptoService = new DESCryptoServiceProvider();
            mobjCryptoService.Key = iv;
            mobjCryptoService.IV = key;
            ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
            //實例MemoryStream流加密文件  
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
            cs.Write(bytln, 0, bytln.Length);
            cs.FlushFinalBlock();
            return System.Convert.ToBase64String(ms.ToArray());

        }
        /// <summary>
        /// Base64解密
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public static string Dencrypting(string source)
        {
            try
            {
                //將解密字符串轉成字節數組  
                byte[] bytln = System.Convert.FromBase64String(source);
                byte[] iv = { 102, 16, 93, 156, 78, 4, 218, 32 };//定義偏移量  
                byte[] key = { 55, 103, 246, 79, 36, 99, 167, 3 };//定義密鑰          
                DESCryptoServiceProvider mobjCryptoService = new DESCryptoServiceProvider();
                mobjCryptoService.Key = iv;
                mobjCryptoService.IV = key;
                //實例流進行解密  
                System.IO.MemoryStream ms = new System.IO.MemoryStream(bytln, 0, bytln.Length);
                ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
                CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
                StreamReader strd = new StreamReader(cs, Encoding.Default);
                return strd.ReadToEnd();
            }
            catch (Exception ex)
            {
                throw new Exception("在文件解密的時候出現錯誤" + ex.Message);
            }
        }  

 

    }
}