public void CryptFile(string SourcePath, string DestinationPath, List<ulong> KeyList)
{
FileInfo file = new FileInfo(SourcePath);
FileStream fs = new FileStream(SourcePath, FileMode.Open, FileAccess.Read);
DES des = new DES();
ulong bufLong = 0;
byte[] buffer = new byte[file.Length];
fs.Read(buffer, 0, (int)file.Length);
fs.Dispose();
for (long i = 0; i < file.Length - file.Length % Const.BlockSizeForFile; i += Const.BlockSizeForFile)
{
ulong temp = 0;
for (byte j = 0; j < Const.BlockSizeForFile; j++)
{
temp |= (ulong)buffer[i + j];
bufLong = temp;
temp <<= Const.BlockSizeForFile;
}
bufLong = des.Crypt(bufLong, KeyList);
for (short j = 7; j >= 0; j--)
{
buffer[i + j] = (byte)(bufLong & Const.Mask8Bit);
bufLong >>= Const.BlockSizeForFile;
}
}
FileStream fscrypt = new FileStream(DestinationPath, FileMode.Create, FileAccess.ReadWrite);
fscrypt.Write(buffer, 0, (int)file.Length);
fscrypt.Dispose();
}
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