C#加密算法

方法一： 
     //须添加对System.Web的引用  

      using System.Web.Security;  


     /// <summary>  

     /// SHA1加密字符串  

     /// </summary>  

     /// <param name="source">源字符串</param>  

     /// <returns>加密后的字符串</returns>  

     public string SHA1(string source)  

    {  

        return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "SHA1");  
     }  


    /// <summary>  
    /// MD5加密字符串  
     /// </summary>  
     /// <param name="source">源字符串</param>  
    /// <returns>加密后的字符串</returns>  
     public string MD5(string source)  

    {  
        return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "MD5");;  
  }


01 方法二(可逆加密解密)： 

    using System.Security.Cryptography;  
  

     public string Encode(string data)  
    {  
         byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);  
         byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);  

         DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();  
        int i = cryptoProvider.KeySize;  
        MemoryStream ms = new MemoryStream();  
         CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);  
      StreamWriter sw = new StreamWriter(cst);  
         sw.Write(data);  
        sw.Flush();  
        cst.FlushFinalBlock();  
         sw.Flush();  

         return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);  

    }  

     public string Decode(string data)  
     {  
         byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);  
         byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);  
     
        byte[] byEnc;  
         try 
       {  
            byEnc = Convert.FromBase64String(data);  
         }  
        catch 
        {  
            return null;  
        }  
      
         DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();  
         MemoryStream ms = new MemoryStream(byEnc);  
         CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);  
        StreamReader sr = new StreamReader(cst);  

         return sr.ReadToEnd();  
    }
方法三(MD5不可逆)： 

    using System.Security.Cryptography;  

    //MD5不可逆加密  

     //32位加密  
      

    public string GetMD5_32(string s, string _input_charset)  

     {  

        MD5 md5 = new MD5CryptoServiceProvider();  

         byte[] t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s));  

        StringBuilder sb = new StringBuilder(32);  

        for (int i = 0; i < t.Length; i++)  

        {  

             sb.Append(t[i].ToString("x").PadLeft(2, '0'));  

         }  

         return sb.ToString();  

     }  

       

     //16位加密  

     public static string GetMd5_16(string ConvertString)  

    {  

         MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();  

       string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4,;  

         t2 = t2.Replace("-", "");  

        return t2;  

    }
01 方法四(对称加密)： 

     using System.IO;  

    using System.Security.Cryptography;  
  

    private SymmetricAlgorithm mobjCryptoService;  

     private string Key;  

    /// <summary>     

     /// 对称加密类的构造函数     

     /// </summary>     

     public SymmetricMethod()  

    {  

       mobjCryptoService = new RijndaelManaged();  

         Key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";  

     }  

     /// <summary>     

     /// 获得密钥     

    /// </summary>     

     /// <returns>密钥</returns>     

     private byte[] GetLegalKey()  

     {  

        string sTemp = Key;  

        mobjCryptoService.GenerateKey();  

         byte[] bytTemp = mobjCryptoService.Key;  

        int KeyLength = bytTemp.Length;  

        if (sTemp.Length > KeyLength)  

             sTemp = sTemp.Substring(0, KeyLength);  

        else if (sTemp.Length < KeyLength)  

           sTemp = sTemp.PadRight(KeyLength, ' ');  

         return ASCIIEncoding.ASCII.GetBytes(sTemp);  

    }  

    /// <summary>     

     /// 获得初始向量IV     

    /// </summary>     

    /// <returns>初试向量IV</returns>     

     private byte[] GetLegalIV()  

     {  

        string sTemp = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";  

        mobjCryptoService.GenerateIV();  

        byte[] bytTemp = mobjCryptoService.IV;  

      int IVLength = bytTemp.Length;  

         if (sTemp.Length > IVLength)  

         sTemp = sTemp.Substring(0, IVLength);  

         else if (sTemp.Length < IVLength)  
             sTemp = sTemp.PadRight(IVLength, ' ');  

         return ASCIIEncoding.ASCII.GetBytes(sTemp);  

     }  

     /// <summary>     

    /// 加密方法     

     /// </summary>     

     /// <param name="Source">待加密的串</param>     

    /// <returns>经过加密的串</returns>     

     public string Encrypto(string Source)  

     {  

         byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);  

         MemoryStream ms = new MemoryStream();  

         mobjCryptoService.Key = GetLegalKey();  

         mobjCryptoService.IV = GetLegalIV();  

         ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();  

         CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);  

        cs.Write(bytIn, 0, bytIn.Length);  

        cs.FlushFinalBlock();  

         ms.Close();  

        byte[] bytOut = ms.ToArray();  

        return Convert.ToBase64String(bytOut);  

    }  

     /// <summary>     

     /// 解密方法     

     /// </summary>     

     /// <param name="Source">待解密的串</param>     

     /// <returns>经过解密的串</returns>     

     public string Decrypto(string Source)  

     {  

         byte[] bytIn = Convert.FromBase64String(Source);  

         MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);  

         mobjCryptoService.Key = GetLegalKey();  

         mobjCryptoService.IV = GetLegalIV();  

         ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();  
         CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);  

         StreamReader sr = new StreamReader(cs);  

         return sr.ReadToEnd();  

     }
方法五： 

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

    using System.Text;  
 

      

     //默认密钥向量  

     private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };  

     /// <summary>  

     /// DES加密字符串  

    /// </summary>  

     /// <param name="encryptString">待加密的字符串</param>  

     /// <param name="encryptKey">加密密钥,要求为8位</param>  

     /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>  

     public static string EncryptDES(string encryptString, string encryptKey)  

     {  

         try 

        {  

             byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0,);  

             byte[] rgbIV = Keys;  

             byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);  

             DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();  

            MemoryStream mStream = new MemoryStream();  

             CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);  

            cStream.Write(inputByteArray, 0, inputByteArray.Length);  

           cStream.FlushFinalBlock();  

           return Convert.ToBase64String(mStream.ToArray());  

      }  

         catch 

        {  

            return encryptString;  

        }  

     }  

       

    /// <summary>  

    /// DES解密字符串  

     /// </summary>  

     /// <param name="decryptString">待解密的字符串</param>  
    /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>  

     /// <returns>解密成功返回解密后的字符串，失败返源串</returns>  

     public static string DecryptDES(string decryptString, string decryptKey)  

     {  

         try 

         {  

            byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);  

            byte[] rgbIV = Keys;  

            byte[] inputByteArray = Convert.FromBase64String(decryptString);  

            DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();  

             MemoryStream mStream = new MemoryStream();  
            CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);  

            cStream.Write(inputByteArray, 0, inputByteArray.Length);  

          cStream.FlushFinalBlock();  
            return Encoding.UTF8.GetString(mStream.ToArray());  

         }  

         catch 

       {  

           return decryptString;  

        }  

    }
///01 方法六(文件加密)： 

     using System.IO;  

     using System.Security.Cryptography;  

    using System.Text;  

     //加密文件  

    private static void EncryptData(String inName, String outName, byte[] desKey, byte[] desIV)  

     {  

         //Create the file streams to handle the input and output files.  

        FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);  

         FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);  

         fout.SetLength(0);  

       

         //Create variables to help with read and write.  

        byte[] bin = new byte[100]; //This is intermediate storage for the encryption.  

         long rdlen = 0;              //This is the total number of bytes written.  

        long totlen = fin.Length;    //This is the total length of the input file.  

       int len;                     //This is the number of bytes to be written at a time.  

       

         DES des = new DESCryptoServiceProvider();  

        CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write);  

       

         //Read from the input file, then encrypt and write to the output file.  

        while (rdlen < totlen)  

         {  

            len = fin.Read(bin, 0, 100);  

            encStream.Write(bin, 0, len);  

            rdlen = rdlen + len;  

         }  
       

         encStream.Close();  

         fout.Close();  
        fin.Close();  

    }  

      

     //解密文件  

     private static void DecryptData(String inName, String outName, byte[] desKey, byte[] desIV)  

    {  

         //Create the file streams to handle the input and output files.  

         FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);  

         FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);  

        fout.SetLength(0);  

       

         //Create variables to help with read and write.  

         byte[] bin = new byte[100]; //This is intermediate storage for the encryption.  

         long rdlen = 0;              //This is the total number of bytes written.  

         long totlen = fin.Length;    //This is the total length of the input file.  

         int len;                     //This is the number of bytes to be written at a time.  

       

        DES des = new DESCryptoServiceProvider();  

         CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(desKey, desIV), CryptoStreamMode.Write);  

      

        //Read from the input file, then encrypt and write to the output file.  

         while (rdlen < totlen)  

        {  

             len = fin.Read(bin, 0, 100);  

             encStream.Write(bin, 0, len);  

             rdlen = rdlen + len;  

         }  

       

         encStream.Close();  

        fout.Close();  

         fin.Close();  

  

}



view sourceprint?01 using System; 

using System.Security.Cryptography;//这个是处理文字编码的前提 

using System.Text; 

using System.IO; 

/// <summary> 

/// DES加密方法 

/// </summary> 

/// <param name="strPlain">明文</param> 

/// <param name="strDESKey">密钥</param> 

/// <param name="strDESIV">向量</param> 

/// <returns>密文</returns> 

public string DESEncrypt(string strPlain,string strDESKey,string strDESIV) 

{ 

  //把密钥转换成字节数组 

  byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey); 
  //把向量转换成字节数组 

  byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV); 

//声明1个新的DES对象 

  DESCryptoServiceProvider desEncrypt=new DESCryptoServiceProvider(); 

  //开辟一块内存流 

  MemoryStream msEncrypt=new MemoryStream(); 

//把内存流对象包装成加密流对象 

  CryptoStream csEncrypt=new CryptoStream(msEncrypt,desEncrypt.CreateEncryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Write); 

  //把加密流对象包装成写入流对象 

  StreamWriter swEncrypt=new StreamWriter(csEncrypt); 

//写入流对象写入明文 

  swEncrypt.WriteLine(strPlain); 

  //写入流关闭 

  swEncrypt.Close(); 

  //加密流关闭 

  csEncrypt.Close(); 

  //把内存流转换成字节数组，内存流现在已经是密文了 

  byte[] bytesCipher=msEncrypt.ToArray(); 

  //内存流关闭 

  msEncrypt.Close(); 

  //把密文字节数组转换为字符串，并返回 

  return UnicodeEncoding.Unicode.GetString(bytesCipher); 

} 

  

/// <summary> 

/// DES解密方法 

/// </summary> 

/// <param name="strCipher">密文</param> 
/// <param name="strDESKey">密钥</param> 

/// <param name="strDESIV">向量</param> 

/// <returns>明文</returns> 

public string DESDecrypt(string strCipher,string strDESKey,string strDESIV) 

{ 

  //把密钥转换成字节数组 

  byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey); 

  //把向量转换成字节数组 

  byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV); 

  //把密文转换成字节数组 

  byte[] bytesCipher=UnicodeEncoding.Unicode.GetBytes(strCipher); 

  //声明1个新的DES对象 
  DESCryptoServiceProvider desDecrypt=new DESCryptoServiceProvider(); 

  //开辟一块内存流，并存放密文字节数组 
  MemoryStream msDecrypt=new MemoryStream(bytesCipher); 
  //把内存流对象包装成解密流对象 

  CryptoStream csDecrypt=new CryptoStream(msDecrypt,desDecrypt.CreateDecryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Read); 

  //把解密流对象包装成读出流对象 

  StreamReader srDecrypt=new StreamReader(csDecrypt); 

  //明文=读出流的读出内容 

string strPlainText=srDecrypt.ReadLine(); 

  //读出流关闭 

srDecrypt.Close(); 
//解密流关闭 

  csDecrypt.Close(); 

//内存流关闭 

msDecrypt.Close(); 

//返回明文 

  return strPlainText; 

}