[C#]File Encryptor

Tool that lets you encrypt&decrypt a file.

Basically major code is below, but feel free to download full source and compile it.

Code:

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private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog xOpen = new OpenFileDialog();
            SaveFileDialog xSave = new SaveFileDialog();
           
            xOpen.Title = "Select File to Encrypt/Decrypt";
            if (xOpen.ShowDialog() == DialogResult.OK)
            {
                if (xSave.ShowDialog() == DialogResult.OK)
                {
                    SaveFile(xSave.FileName, EncryptBytes(OpenFile(xOpen.FileName), 0xDC));
                }
            }
        }
        public byte[] EncryptBytes(byte[] input, byte xorKey)
        {
            byte[] output = new byte[input.Length];
            for (int i = 0; i < input.Length; i++)
            {
                output[i] = (byte)(input[i]^xorKey);
                xorKey ^= (byte)((input.Length - 1) + i);
            }
            return output;
        }
        public byte[] OpenFile(string filePath)
        {
            FileStream openFile = File.OpenRead(filePath);
            byte[] inputFile = new byte[openFile.Length];
            openFile.Read(inputFile, 0, (int)openFile.Length);
            openFile.Close();
            return inputFile;
        }
        public void SaveFile(string filePath, byte[] fileContent)
        {
            FileStream saveFile = new FileStream(filePath, FileMode.Create, FileAccess.Write);
            saveFile.Write(fileContent, 0, (int)fileContent.Length);
            saveFile.Close();
        }

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Download full source

P.S. This is my first product after learning about XOR

would be more smexy with a hawter UI ;]

maybe incorporate a custom salt/encryption key?

Done something like this in the pass, using XOR and Delphi