File Encryption and Decryption in C#

http://www.codeproject.com/KB/files/encryption.aspx

 

    /**/ ///<summary>
        /// Steve Lydford - 12/05/2008.
        ///
        /// Encrypts a file using Rijndael algorithm.
        ///</summary>
        ///<param name="inputFile"></param>
        ///<param name="outputFile"></param>
         private   void  EncryptFile( string  inputFile,  string  outputFile)
         ... {
 
            try
            ...{
                string password = @"myKey123"; // Your Key Here
                UnicodeEncoding UE = new UnicodeEncoding();
                byte[] key = UE.GetBytes(password);
 
                string cryptFile = outputFile;
                FileStream fsCrypt = new FileStream(cryptFile, FileMode.Create);
 
                RijndaelManaged RMCrypto = new RijndaelManaged();
 
                CryptoStream cs = new CryptoStream(fsCrypt,
                    RMCrypto.CreateEncryptor(key, key),
                    CryptoStreamMode.Write);
 
                FileStream fsIn = new FileStream(inputFile, FileMode.Open);
 
                int data;
                while ((data = fsIn.ReadByte()) != -1)
                    cs.WriteByte((byte)data);
 
                
                fsIn.Close();
                cs.Close();
                fsCrypt.Close();
            }
            catch
            ...{
                MessageBox.Show("Encryption failed!", "Error");
            }
        }
         /**/ ///<summary>
        /// Steve Lydford - 12/05/2008.
        ///
        /// Decrypts a file using Rijndael algorithm.
        ///</summary>
        ///<param name="inputFile"></param>
        ///<param name="outputFile"></param>
         private   void  DecryptFile( string  inputFile,  string  outputFile)
         ... {
 
            ...{
                string password = @"myKey123"; // Your Key Here
 
                UnicodeEncoding UE = new UnicodeEncoding();
                byte[] key = UE.GetBytes(password);
 
                FileStream fsCrypt = new FileStream(inputFile, FileMode.Open);
 
                RijndaelManaged RMCrypto = new RijndaelManaged();
 
                CryptoStream cs = new CryptoStream(fsCrypt,
                    RMCrypto.CreateDecryptor(key, key),
                    CryptoStreamMode.Read);
 
                FileStream fsOut = new FileStream(outputFile, FileMode.Create);
 
                int data;
                while ((data = cs.ReadByte()) != -1)
                    fsOut.WriteByte((byte)data);
 
                fsOut.Close();
                cs.Close();
                fsCrypt.Close();
 
            }
        }