private static async ValueTask <string> EncryptFileAsync(
string fileName, Cryptographer cryptographer)
{
string encryptedFileName = $"{fileName}.encrypt";
await using FileStream outputFileStream =
new FileStream(encryptedFileName, FileMode.Create);
string data = await File.ReadAllTextAsync(fileName);
await cryptographer.EncryptAsync(data, outputFileStream);
return(encryptedFileName);
}
public void EncryptAesManaged()
{
string text = "You've fallen for one of the two classic blunders! The first being never get involved in a land war in Asia but only slightly lesser known: never go in against a cicelean when DEATH is on the line! HAHAHAHAHAHAHA *dies* You only think I guessed wrong! That's what's so funny! I switched glasses when your back was turned! Ha ha! You fool! You fell victim to one of the classic blunders - The most famous of which is 'never get involved in a land war in Asia' - but only slightly less well - known is this: 'Never go against a Sicilian when death is on the line!' Ha ha ha ha ha ha ha!";
// Create Aes that generates a new key and initialization vector (IV).
// Same key must be used in encryption and decryption
using (AesManaged aes = new AesManaged())
{
// Encrypt string
byte[] encrypted = Cryptographer.EncryptAsync(text, aes.Key, aes.IV).Result;
// Decrypt the bytes to a string.
string decrypted = Cryptographer.DecryptAsync(encrypted, aes.Key, aes.IV).Result;
// Print decrypted string. It should be same as raw data
Assert.AreEqual <string>(text, decrypted);
}
}
static public async IAsyncEnumerable <string> EncryptFilesAsync(
string directoryPath = null, string searchPattern = "*",
[EnumeratorCancellation] CancellationToken cancellationToken = default)
{
IEnumerable <string> files = Directory.EnumerateFiles(
directoryPath ?? Directory.GetCurrentDirectory(), searchPattern,
SearchOption.AllDirectories);
foreach (string fileName in files)
{
string encryptedFileName = $"{fileName}.encrypt";
using (FileStream outputFileStream =
new FileStream(encryptedFileName, FileMode.Create))
{
string data = await File.ReadAllTextAsync(fileName);
await Cryptographer.EncryptAsync(data, outputFileStream);
yield return(encryptedFileName);
cancellationToken.ThrowIfCancellationRequested();
}
}
}