using System;
using System.IO;
using System.Security.Cryptography;
using VeraCrypt;

class Program
{
    static void Main(string[] args)
    {
        // Get the drive letter of the drive to encrypt
        Console.Write("Enter the drive letter to encrypt (e.g. C): ");
        string driveLetter = Console.ReadLine().ToUpper() + ":";

        // Get the password for the encryption
        Console.Write("Enter the password for the encryption: ");
        string password = Console.ReadLine();

        // Create a new VeraCrypt driver object
        using (VeraCryptDriver driver = new VeraCryptDriver())
        {
            // Mount the VeraCrypt volume to the specified drive letter
            driver.Mount(volumeFile: null, password: password, driveLetter: driveLetter);

            // Get the mounted volume's device path
            string devicePath = driver.GetDevicePath(driveLetter);

            // Get the size of the device in bytes
            long deviceSize = new FileInfo(devicePath).Length;

            // Unmount the VeraCrypt volume
            driver.Unmount(driveLetter);

            // Create a new VeraCrypt volume with the same size as the device
            using (VeraCryptVolume volume = new VeraCryptVolume())
            {
                // Create the new volume with a random keyfile and no hidden volume
                volume.Create(password: password, volumeFile: null, keyfiles: null, fileSystem: FileSystemFormat.NTFS, size: deviceSize,
                    clusterSize: 0, encryption: EncryptionAlgorithm.AES, hash: HashAlgorithm.SHA256, hiddenVolumeSize: 0,
                    hiddenVolumeProtection: false, nonInteractive: true, verbose: false);

                // Mount the new VeraCrypt volume to the specified drive letter
                volume.Mount(password: password, keyfiles: null, driveLetter: driveLetter, readOnly: false);

                // Copy the contents of the unencrypted device to the VeraCrypt volume
                using (FileStream deviceStream = new FileStream(devicePath, FileMode.Open, FileAccess.Read))
                {
                    using (FileStream volumeStream = new FileStream(@"\\.\" + driveLetter, FileMode.Open, FileAccess.Write))
                    {
                        deviceStream.CopyTo(volumeStream);
                    }
                }

                // Unmount the VeraCrypt volume
                volume.Unmount(forceDismount: true);
            }
        }

        Console.WriteLine("Drive encryption complete.");
    }
}