c++实现TripleDESCryptoServiceProvider解密方法

这是C#的例子：

 DESCryptoServiceProvider provider = new DESCryptoServiceProvider();            
byte[] buffer = new byte[pToDecrypt.Length / 2];           
 for (int i = 0; i < (pToDecrypt.Length / 2); i++)          
  {               
 int num2 = Convert.ToInt32(pToDecrypt.Substring(i * 2, 2), 0x10);               
 buffer[i] = (byte)num2;          
  }          
  provider.Key = Encoding.ASCII.GetBytes(keys);           
 provider.IV = Encoding.ASCII.GetBytes(keys);            
MemoryStream stream = new MemoryStream();            
CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);            
stream2.Write(buffer, 0, buffer.Length);           
 stream2.FlushFinalBlock();           
 return Encoding.Default.GetString(stream.ToArray());

求方法，用C++替代上面的方法，主要是key和iv怎么处理？

这块这个是不是：
windows的