//Added size return, since symbolic links return 0, we use this function also to return the size of the file.
private long CanAccessFile(string fileName)
{
try
{
using (FileStream fs = File.Open(fileName, FileMode.Open, FileAccess.Read, FileShare.None))
{
long size = fs.Seek(0, SeekOrigin.End);
fs.Close();
return(size);
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return(0);
}
}
/// <summary>
/// Transforms a file into its cryptographically strong equivalent using AES256 in CBC mode.
/// </summary>
/// <param name="originalFile">The path to the file to be cryptographically transformed.</param>
/// <param name="encryptedFile">The path where the new file will be created.</param>
/// <param name="password">The key to be used during the cryptographic transformation.</param>
/// <returns>A flag determining whether or not the operation was successful.</returns>
public static bool EncryptFile(string originalFile, string encryptedFile, byte[] password)
{
try
{
string originalFilename = originalFile;
string encryptedFilename = encryptedFile;
using (var originalStream = LongFile.Open(originalFile, FileMode.Open))
using (var encryptedStream = LongFile.Create(encryptedFile, 8192))
using (var encTransform = new EtM_EncryptTransform(key: password))
using (var crypoStream = new CryptoStream(encryptedStream, encTransform, CryptoStreamMode.Write))
{
originalStream.CopyTo(crypoStream);
}
return(true);
}
catch { return(false); }
}
/// <summary>
/// Asynchronously transforms a file into its cryptographically strong equivalent using AES256 in CBC mode.
/// </summary>
/// <param name="originalFile">The path to the file to be cryptographically transformed.</param>
/// <param name="encryptedFile">The path where the new file will be created.</param>
/// <param name="password">The key to be used during the cryptographic transformation.</param>
/// <returns>A flag determining whether or not the operation was successful.</returns>
public static async Task <bool> EncryptFileAsync(string originalFile, string encryptedFile, string password)
{
try
{
string originalFilename = originalFile;
string encryptedFilename = encryptedFile;
using (var originalStream = LongFile.Open(originalFile, FileMode.Open))
using (var encryptedStream = LongFile.Create(encryptedFile, 8192))
using (var encTransform = new EtM_EncryptTransform(key: password.ToBytes()))
using (var crypoStream = new CryptoStream(encryptedStream, encTransform, CryptoStreamMode.Write))
{
await originalStream.CopyToAsync(crypoStream);
return(true);
}
}
catch { return(false); }
}
public void TestOpenWithAccess()
{
var tempLongPathFilename = new StringBuilder(longPathDirectory).Append(@"\").Append(Path.GetRandomFileName()).ToString();
try
{
using (var s = File.Create(tempLongPathFilename))
{
s.WriteByte(42);
}
using (File.Open(tempLongPathFilename, FileMode.Open, FileAccess.Read))
{
}
}
finally
{
File.Delete(tempLongPathFilename);
}
}
public void TestOpenExisting()
{
var tempLongPathFilename = new StringBuilder(longPathDirectory).Append(@"\").Append("filename.ext").ToString();
try
{
using (var s = File.Create(tempLongPathFilename))
{
s.WriteByte(42);
}
using (var stream = File.Open(tempLongPathFilename, FileMode.Open))
{
Assert.IsNotNull(stream);
}
}
finally
{
File.Delete(tempLongPathFilename);
}
}
/// <summary>
/// Asynchronously transforms a cryptographic file into its original form using AES256 in CBC mode.
/// </summary>
/// <param name="originalFile">The path to the file to be transformed into its decrypted form.</param>
/// <param name="decryptedFile">The location the decrypted file will be written to.</param>
/// <param name="password">The key to use during the cryptographic transformation.</param>
/// <returns>A flag determining whether or not the operation was successful or not.</returns>
public static async Task <bool> DecryptFileAsync(string originalFile, string decryptedFile, byte[] password)
{
try
{
string originalFilename = originalFile;
string decryptedFilename = decryptedFile;
using (var encryptedStream = LongFile.Open(originalFilename, FileMode.Open))
using (var decryptedStream = LongFile.Create(decryptedFilename, 8192))
using (var decTransform = new EtM_DecryptTransform(key: password))
{
using (var cryptoStream = new CryptoStream(encryptedStream, decTransform, CryptoStreamMode.Read))
await cryptoStream.CopyToAsync(decryptedStream);
if (!decTransform.IsComplete)
{
throw new Exception("Not all blocks have been decrypted.");
}
}
return(true);
}
catch { return(false); }
}
public static FileStream Open(string path, FileMode mode, FileAccess access, FileShare share, int bufferSize)
{
return(File.Open(path, mode, access, share, bufferSize));
}
public static FileStream Open(string path, FileMode mode, FileAccess access)
{
return(File.Open(path, mode, access));
}
public static FileStream Open(string path, FileMode mode)
{
return(File.Open(path, mode));
}
public PsStream(string filenamePath)
{
this.fileStream = File.Open(filenamePath, FileMode.Open, FileAccess.Read, FileShare.Read);
this._length = new FileInfo(filenamePath).Length;
}