文件加密＆字符加密的代码

 
///<summary>文件加密类 使用DES加密文件流</summary>
///<param>desKey: DES的密钥；desIV: DES向量</param>
class encrypfile{
     public byte[] desKey;
     public byte[] desIV;
     public encrypfile(byte[] inputKey,byte[] inputIV){
         desKey=inputKey;
         desIV=inputIV;
     }
     ///<summary>加密主方法</summary>
     ///<param>inName:被加密文件名；outName: 加密后文件名</param>
     public void begintoencry(string inName,string outName){
         FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
         FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
         fout.SetLength(0);
         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.