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public static void Decrypt(string fileIn,string fileOut, string Password)
{
// First we are going to open the file streams
FileStream fsIn = new FileStream(fileIn,FileMode.Open, FileAccess.Read);
FileStream fsOut = new FileStream(fileOut,FileMode.OpenOrCreate, FileAccess.Write);
// Then we are going to derive a Key and an IV from
// the Password and create an algorithm
PasswordDeriveBytes pdb = new PasswordDeriveBytes(Password,
new byte[] {0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d,
0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76});
Rijndael alg = Rijndael.Create();
alg.Key = pdb.GetBytes(32);
alg.IV = pdb.GetBytes(16);
// Now create a crypto stream through which we are going
// to be pumping data.
// Our fileOut is going to be receiving the Decrypted bytes.
CryptoStream cs = new CryptoStream(fsOut,
alg.CreateDecryptor(), CryptoStreamMode.Write);
// Now will will initialize a buffer and will be
// processing the input file in chunks.
// This is done to avoid reading the whole file (which can be
// huge) into memory.
int bufferLen = 4096;
byte[] buffer = new byte[bufferLen];
int bytesRead;
do
{
// read a chunk of data from the input file
bytesRead = fsIn.Read(buffer, 0, bufferLen);
if (bytesRead == 0) break;
// Decrypt it
cs.Write(buffer, 0, bytesRead);
} while(bytesRead != 0);
// close everything
// this will also close the unrelying fsOut stream
cs.Close(); // ERROR ! ERROR!
fsIn.Close();
}
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