rijndael 加密解密小例子(二)

 

//解密，返回解密后的 DateSet,传入的参数是需解密的文件名
        public DataSet EnCrypt(string InName)
        {
            FileStream fsIn = new FileStream(InName,FileMode.Open,FileAccess.Read);

            byte[] Key = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
            byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};

            RijndaelManaged RMCrypto = new RijndaelManaged();

            System.Security.Cryptography.CryptoStream cs = new CryptoStream(fsIn,RMCrypto.CreateDecryptor(Key,IV),CryptoStreamMode.Read);
            DataSet myDataSet = new DataSet ();
            System.Xml.XmlTextReader XmlReader ;
            try
            {
                XmlReader = new System.Xml.XmlTextReader (cs);
                myDataSet.ReadXml(XmlReader);
                XmlReader.Close ();
                fsIn.Close();
            }
            catch(System.Exception e)
            {
            }
            return myDataSet;
        }

        //加密，InName表示要加密的文件，OutName为加密后的文件名
        public void Crypt(string InName,string OutName)
        {
            FileStream fsIn = new FileStream(InName,FileMode.Open,FileAccess.Read);

            FileStream fsOut = new FileStream(OutName,FileMode.Create,FileAccess.Write);

            byte[] Key = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
            byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};

            RijndaelManaged RMCrypto = new RijndaelManaged();

            System.Security.Cryptography.CryptoStream cs = new CryptoStream(fsOut,RMCrypto.CreateEncryptor(Key,IV),CryptoStreamMode.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 = fsIn.Length;    //This is the total length of the input file.
            int len;                     //This is the number of bytes to be written at a time.

            while(rdlen < totlen)
            {
                len = fsIn.Read(bin, 0, 100);
                cs.Write(bin, 0, len);
                rdlen = rdlen + len;
                Console.WriteLine("{0} bytes processed", rdlen);
            }

            cs.Close();
            fsOut.Close();
            fsIn.Close();

        }