C# 加密方法汇总代码,CSharp代码库,德仔网

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【CSharp】 C# 加密方法汇总
作者:08shiyan / 发布于2011/5/31/ 730
<div><span style="color: rgb(0,0,0)">方法一：
</span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">须添加对System.Web的引用</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,255)">using</span><span style="color: rgb(0,0,0)"> System.Web.Security;
...
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><summary></span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> SHA1加密字符串
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"></summary></span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><param name="source"></span><span style="color: rgb(0,128,0)">源字符串</span><span style="color: rgb(128,128,128)"></param></span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><returns></span><span style="color: rgb(0,128,0)">加密后的字符串</span><span style="color: rgb(128,128,128)"></returns></span><span style="color: rgb(128,128,128)">
</span><span style="color: rgb(0,0,255)">public</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> SHA1(</span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> source)
{
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> FormsAuthentication.HashPasswordForStoringInConfigFile(source, </span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">SHA1</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">);
}
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><summary></span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> MD5加密字符串
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"></summary></span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><param name="source"></span><span style="color: rgb(0,128,0)">源字符串</span><span style="color: rgb(128,128,128)"></param></span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><returns></span><span style="color: rgb(0,128,0)">加密后的字符串</span><span style="color: rgb(128,128,128)"></returns></span><span style="color: rgb(128,128,128)">
</span><span style="color: rgb(0,0,255)">public</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> MD5(</span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> source)
{
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> FormsAuthentication.HashPasswordForStoringInConfigFile(source, </span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">MD5</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">);;
}
方法二(可逆加密解密)：
</span><span style="color: rgb(0,0,255)">using</span><span style="color: rgb(0,0,0)"> System.Security.Cryptography;
...
</span><span style="color: rgb(0,0,255)">public</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> Encode(</span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> data)
{
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] byKey </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] byIV </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
 DESCryptoServiceProvider cryptoProvider </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> DESCryptoServiceProvider();
 </span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> i </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> cryptoProvider.KeySize;
 MemoryStream ms </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> MemoryStream();
 CryptoStream cst </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);
 StreamWriter sw </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> StreamWriter(cst);
 sw.Write(data);
 sw.Flush();
 cst.FlushFinalBlock();
 sw.Flush();
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> Convert.ToBase64String(ms.GetBuffer(), </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, (</span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)">)ms.Length);
}
</span><span style="color: rgb(0,0,255)">public</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> Decode(</span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> data)
{
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] byKey </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] byIV </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] byEnc;
 </span><span style="color: rgb(0,0,255)">try</span><span style="color: rgb(0,0,0)">
 {
 byEnc </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> Convert.FromBase64String(data);
 }
 </span><span style="color: rgb(0,0,255)">catch</span><span style="color: rgb(0,0,0)">
 {
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">null</span><span style="color: rgb(0,0,0)">;
 }
 DESCryptoServiceProvider cryptoProvider </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> DESCryptoServiceProvider();
 MemoryStream ms </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> MemoryStream(byEnc);
 CryptoStream cst </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
 StreamReader sr </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> StreamReader(cst);
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> sr.ReadToEnd();
}
方法三(MD5不可逆)：
</span><span style="color: rgb(0,0,255)">using</span><span style="color: rgb(0,0,0)"> System.Security.Cryptography;
...
</span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">MD5不可逆加密
</span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">32位加密</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,255)">public</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> GetMD5_32(</span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> s, </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> _input_charset)
{
 MD5 md5 </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> MD5CryptoServiceProvider();
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] t </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s));
 StringBuilder sb </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> StringBuilder(</span><span style="color: rgb(128,0,128)">32</span><span style="color: rgb(0,0,0)">);
 </span><span style="color: rgb(0,0,255)">for</span><span style="color: rgb(0,0,0)"> (</span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> i </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">; i </span><span style="color: rgb(0,0,0)"><</span><span style="color: rgb(0,0,0)"> t.Length; i</span><span style="color: rgb(0,0,0)">++</span><span style="color: rgb(0,0,0)">)
 {
 sb.Append(t[i].ToString(</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">x</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">).PadLeft(</span><span style="color: rgb(128,0,128)">2</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,0)">'</span><span style="color: rgb(128,0,0)">0</span><span style="color: rgb(128,0,0)">'</span><span style="color: rgb(0,0,0)">));
 }
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> sb.ToString();
}
</span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">16位加密</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,255)">public</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">static</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> GetMd5_16(</span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> ConvertString)
{
 MD5CryptoServiceProvider md5 </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> MD5CryptoServiceProvider();
 </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> t2 </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), </span><span style="color: rgb(128,0,128)">4</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">8</span><span style="color: rgb(0,0,0)">);
 t2 </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> t2.Replace(</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">-</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,0)">""</span><span style="color: rgb(0,0,0)">);
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> t2;
}
方法四(对称加密)：
</span><span style="color: rgb(0,0,255)">using</span><span style="color: rgb(0,0,0)"> System.IO;
</span><span style="color: rgb(0,0,255)">using</span><span style="color: rgb(0,0,0)"> System.Security.Cryptography;
...
</span><span style="color: rgb(0,0,255)">private</span><span style="color: rgb(0,0,0)"> SymmetricAlgorithm mobjCryptoService;
</span><span style="color: rgb(0,0,255)">private</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> Key;
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><summary></span><span style="color: rgb(0,128,0)"> 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> 对称加密类的构造函数 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"></summary></span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)">
</span><span style="color: rgb(0,0,255)">public</span><span style="color: rgb(0,0,0)"> SymmetricMethod()
{
 mobjCryptoService </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> RijndaelManaged();
 Key </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">;
}
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><summary></span><span style="color: rgb(0,128,0)"> 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> 获得密钥 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"></summary></span><span style="color: rgb(0,128,0)"> 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><returns></span><span style="color: rgb(0,128,0)">密钥</span><span style="color: rgb(128,128,128)"></returns></span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)">
</span><span style="color: rgb(0,0,255)">private</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] GetLegalKey()
{
 </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> sTemp </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> Key;
 mobjCryptoService.GenerateKey();
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] bytTemp </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> mobjCryptoService.Key;
 </span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> KeyLength </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> bytTemp.Length;
 </span><span style="color: rgb(0,0,255)">if</span><span style="color: rgb(0,0,0)"> (sTemp.Length </span><span style="color: rgb(0,0,0)">></span><span style="color: rgb(0,0,0)"> KeyLength)
 sTemp </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> sTemp.Substring(</span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, KeyLength);
 </span><span style="color: rgb(0,0,255)">else</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">if</span><span style="color: rgb(0,0,0)"> (sTemp.Length </span><span style="color: rgb(0,0,0)"><</span><span style="color: rgb(0,0,0)"> KeyLength)
 sTemp </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> sTemp.PadRight(KeyLength, </span><span style="color: rgb(128,0,0)">'</span><span style="color: rgb(128,0,0)"> </span><span style="color: rgb(128,0,0)">'</span><span style="color: rgb(0,0,0)">);
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> ASCIIEncoding.ASCII.GetBytes(sTemp);
}
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><summary></span><span style="color: rgb(0,128,0)"> 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> 获得初始向量IV 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"></summary></span><span style="color: rgb(0,128,0)"> 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><returns></span><span style="color: rgb(0,128,0)">初试向量IV</span><span style="color: rgb(128,128,128)"></returns></span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)">
</span><span style="color: rgb(0,0,255)">private</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] GetLegalIV()
{
 </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> sTemp </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">;
 mobjCryptoService.GenerateIV();
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] bytTemp </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> mobjCryptoService.IV;
 </span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> IVLength </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> bytTemp.Length;
 </span><span style="color: rgb(0,0,255)">if</span><span style="color: rgb(0,0,0)"> (sTemp.Length </span><span style="color: rgb(0,0,0)">></span><span style="color: rgb(0,0,0)"> IVLength)
 sTemp </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> sTemp.Substring(</span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, IVLength);
 </span><span style="color: rgb(0,0,255)">else</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">if</span><span style="color: rgb(0,0,0)"> (sTemp.Length </span><span style="color: rgb(0,0,0)"><</span><span style="color: rgb(0,0,0)"> IVLength)
 sTemp </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> sTemp.PadRight(IVLength, </span><span style="color: rgb(128,0,0)">'</span><span style="color: rgb(128,0,0)"> </span><span style="color: rgb(128,0,0)">'</span><span style="color: rgb(0,0,0)">);
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> ASCIIEncoding.ASCII.GetBytes(sTemp);
}
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><summary></span><span style="color: rgb(0,128,0)"> 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> 加密方法 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"></summary></span><span style="color: rgb(0,128,0)"> 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><param name="Source"></span><span style="color: rgb(0,128,0)">待加密的串</span><span style="color: rgb(128,128,128)"></param></span><span style="color: rgb(0,128,0)"> 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><returns></span><span style="color: rgb(0,128,0)">经过加密的串</span><span style="color: rgb(128,128,128)"></returns></span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)">
</span><span style="color: rgb(0,0,255)">public</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> Encrypto(</span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> Source)
{
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] bytIn </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> UTF8Encoding.UTF8.GetBytes(Source);
 MemoryStream ms </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> MemoryStream();
 mobjCryptoService.Key </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> GetLegalKey();
 mobjCryptoService.IV </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> GetLegalIV();
 ICryptoTransform encrypto </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> mobjCryptoService.CreateEncryptor();
 CryptoStream cs </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> CryptoStream(ms, encrypto, CryptoStreamMode.Write);
 cs.Write(bytIn, </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, bytIn.Length);
 cs.FlushFinalBlock();
 ms.Close();
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] bytOut </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> ms.ToArray();
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> Convert.ToBase64String(bytOut);
}
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><summary></span><span style="color: rgb(0,128,0)"> 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> 解密方法 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"></summary></span><span style="color: rgb(0,128,0)"> 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><param name="Source"></span><span style="color: rgb(0,128,0)">待解密的串</span><span style="color: rgb(128,128,128)"></param></span><span style="color: rgb(0,128,0)"> 
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><returns></span><span style="color: rgb(0,128,0)">经过解密的串</span><span style="color: rgb(128,128,128)"></returns></span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)">
</span><span style="color: rgb(0,0,255)">public</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> Decrypto(</span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> Source)
{
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] bytIn </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> Convert.FromBase64String(Source);
 MemoryStream ms </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> MemoryStream(bytIn, </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, bytIn.Length);
 mobjCryptoService.Key </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> GetLegalKey();
 mobjCryptoService.IV </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> GetLegalIV();
 ICryptoTransform encrypto </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> mobjCryptoService.CreateDecryptor();
 CryptoStream cs </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> CryptoStream(ms, encrypto, CryptoStreamMode.Read);
 StreamReader sr </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> StreamReader(cs);
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> sr.ReadToEnd();
}
方法五：
</span><span style="color: rgb(0,0,255)">using</span><span style="color: rgb(0,0,0)"> System.IO;
</span><span style="color: rgb(0,0,255)">using</span><span style="color: rgb(0,0,0)"> System.Security.Cryptography;
</span><span style="color: rgb(0,0,255)">using</span><span style="color: rgb(0,0,0)"> System.Text;
...
</span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">默认密钥向量</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,255)">private</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">static</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] Keys </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> { </span><span style="color: rgb(128,0,128)">0x12</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">0x34</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">0x56</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">0x78</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">0x90</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">0xAB</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">0xCD</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">0xEF</span><span style="color: rgb(0,0,0)"> };
</span><span style="color: rgb(0,128,0)">/**//**//**/</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><summary></span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> DES加密字符串
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"></summary></span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><param name="encryptString"></span><span style="color: rgb(0,128,0)">待加密的字符串</span><span style="color: rgb(128,128,128)"></param></span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><param name="encryptKey"></span><span style="color: rgb(0,128,0)">加密密钥,要求为8位</span><span style="color: rgb(128,128,128)"></param></span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><returns></span><span style="color: rgb(0,128,0)">加密成功返回加密后的字符串，失败返回源串</span><span style="color: rgb(128,128,128)"></returns></span><span style="color: rgb(128,128,128)">
</span><span style="color: rgb(0,0,255)">public</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">static</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> EncryptDES(</span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> encryptString, </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> encryptKey)
{
 </span><span style="color: rgb(0,0,255)">try</span><span style="color: rgb(0,0,0)">
 {
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] rgbKey </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> Encoding.UTF8.GetBytes(encryptKey.Substring(</span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">8</span><span style="color: rgb(0,0,0)">));
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] rgbIV </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> Keys;
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] inputByteArray </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> Encoding.UTF8.GetBytes(encryptString);
 DESCryptoServiceProvider dCSP </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> DESCryptoServiceProvider();
 MemoryStream mStream </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> MemoryStream();
 CryptoStream cStream </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
 cStream.Write(inputByteArray, </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, inputByteArray.Length);
 cStream.FlushFinalBlock();
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> Convert.ToBase64String(mStream.ToArray());
 }
 </span><span style="color: rgb(0,0,255)">catch</span><span style="color: rgb(0,0,0)">
 {
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> encryptString;
 }
}
</span><span style="color: rgb(0,128,0)">/**//**//**/</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><summary></span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> DES解密字符串
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"></summary></span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><param name="decryptString"></span><span style="color: rgb(0,128,0)">待解密的字符串</span><span style="color: rgb(128,128,128)"></param></span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><param name="decryptKey"></span><span style="color: rgb(0,128,0)">解密密钥,要求为8位,和加密密钥相同</span><span style="color: rgb(128,128,128)"></param></span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><returns></span><span style="color: rgb(0,128,0)">解密成功返回解密后的字符串，失败返源串</span><span style="color: rgb(128,128,128)"></returns></span><span style="color: rgb(128,128,128)">
</span><span style="color: rgb(0,0,255)">public</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">static</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> DecryptDES(</span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> decryptString, </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> decryptKey)
{
 </span><span style="color: rgb(0,0,255)">try</span><span style="color: rgb(0,0,0)">
 {
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] rgbKey </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> Encoding.UTF8.GetBytes(decryptKey);
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] rgbIV </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> Keys;
 </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] inputByteArray </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> Convert.FromBase64String(decryptString);
 DESCryptoServiceProvider DCSP </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> DESCryptoServiceProvider();
 MemoryStream mStream </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> MemoryStream();
 CryptoStream cStream </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
 cStream.Write(inputByteArray, </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, inputByteArray.Length);
 cStream.FlushFinalBlock();
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> Encoding.UTF8.GetString(mStream.ToArray());
 }
 </span><span style="color: rgb(0,0,255)">catch</span><span style="color: rgb(0,0,0)">
 {
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> decryptString;
 }
} 
方法六(文件加密)：
</span><span style="color: rgb(0,0,255)">using</span><span style="color: rgb(0,0,0)"> System.IO;
</span><span style="color: rgb(0,0,255)">using</span><span style="color: rgb(0,0,0)"> System.Security.Cryptography;
</span><span style="color: rgb(0,0,255)">using</span><span style="color: rgb(0,0,0)"> System.Text;
...
</span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">加密文件</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,255)">private</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">static</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">void</span><span style="color: rgb(0,0,0)"> EncryptData(String inName, String outName, </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] desKey, </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] desIV)
{
 </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">Create the file streams to handle the input and output files.</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> FileStream fin </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> FileStream(inName, FileMode.Open, FileAccess.Read);
 FileStream fout </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
 fout.SetLength(</span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">);
 </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">Create variables to help with read and write.</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] bin </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[</span><span style="color: rgb(128,0,128)">100</span><span style="color: rgb(0,0,0)">]; </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">This is intermediate storage for the encryption.</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">long</span><span style="color: rgb(0,0,0)"> rdlen </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">; </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">This is the total number of bytes written.</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">long</span><span style="color: rgb(0,0,0)"> totlen </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> fin.Length; </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">This is the total length of the input file.</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> len; </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">This is the number of bytes to be written at a time.</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> DES des </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> DESCryptoServiceProvider();
 CryptoStream encStream </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> CryptoStream(fout, des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write);
 </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">Read from the input file, then encrypt and write to the output file.</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">while</span><span style="color: rgb(0,0,0)"> (rdlen </span><span style="color: rgb(0,0,0)"><</span><span style="color: rgb(0,0,0)"> totlen)
 {
 len </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> fin.Read(bin, </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">100</span><span style="color: rgb(0,0,0)">);
 encStream.Write(bin, </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, len);
 rdlen </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> rdlen </span><span style="color: rgb(0,0,0)">+</span><span style="color: rgb(0,0,0)"> len;
 }
 encStream.Close();
 fout.Close();
 fin.Close();
}
</span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">解密文件</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,255)">private</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">static</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">void</span><span style="color: rgb(0,0,0)"> DecryptData(String inName, String outName, </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] desKey, </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] desIV)
{
 </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">Create the file streams to handle the input and output files.</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> FileStream fin </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> FileStream(inName, FileMode.Open, FileAccess.Read);
 FileStream fout </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
 fout.SetLength(</span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">);
 </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">Create variables to help with read and write.</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] bin </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[</span><span style="color: rgb(128,0,128)">100</span><span style="color: rgb(0,0,0)">]; </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">This is intermediate storage for the encryption.</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">long</span><span style="color: rgb(0,0,0)"> rdlen </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">; </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">This is the total number of bytes written.</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">long</span><span style="color: rgb(0,0,0)"> totlen </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> fin.Length; </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">This is the total length of the input file.</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> len; </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">This is the number of bytes to be written at a time.</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> DES des </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> DESCryptoServiceProvider();
 CryptoStream encStream </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> CryptoStream(fout, des.CreateDecryptor(desKey, desIV), CryptoStreamMode.Write);
 </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">Read from the input file, then encrypt and write to the output file.</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">while</span><span style="color: rgb(0,0,0)"> (rdlen </span><span style="color: rgb(0,0,0)"><</span><span style="color: rgb(0,0,0)"> totlen)
 {
 len </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> fin.Read(bin, </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">100</span><span style="color: rgb(0,0,0)">);
 encStream.Write(bin, </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, len);
 rdlen </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> rdlen </span><span style="color: rgb(0,0,0)">+</span><span style="color: rgb(0,0,0)"> len;
 }
 encStream.Close();
 fout.Close();
 fin.Close();
}

</span></div>
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