public void TestTwofishFileDecryption()
{
byte[] data = new byte[10000];
new Random().NextBytes(data); // fill random data
using (var senderRsa = new RSACryptoServiceProvider())
{
var senderPrivateKey = senderRsa.ExportParameters(true);
using (var receiverRsa = new RSACryptoServiceProvider())
{
var receiverPrivateKey = receiverRsa.ExportParameters(true);
var receiverPublicKey = receiverRsa.ExportParameters(false);
CryptCombo combo = new CryptCombo(MD5.Create(), new TwofishMachine());
MemoryStream cryptedFileStream = new MemoryStream();
OriginalFile originFile = new OriginalFile(new MemoryStream(data), ".java");
FileCryptor cryptor = new FileCryptor(senderPrivateKey, receiverPublicKey);
cryptor.Encrypt(originFile, cryptedFileStream, combo);
MemoryStream decryptedStream = new MemoryStream();
EncryptedFile newCryptedFile = EncryptedFileChecker.Parse(cryptedFileStream);
FileDecryptor decryptor = new FileDecryptor(receiverPrivateKey);
decryptor.Decrypt(newCryptedFile, decryptedStream);
Assert.IsTrue(decryptedStream.ToArray().SequenceEqual(data));
}
}
}
public void DecryptFile(EncryptedFile input, FileStream output, ProgressReporter reporter = null)
{
var cert = new X509Certificate2(this.sender.PublicCertificate);
if (cert == null)
{
reporter?.Log("Sender certificate error. Unable to verify integrity.");
}
else
{
reporter?.Log("Certificate located.");
if (CertificateValidator.VerifyCertificate(cert) == false)
{
reporter?.Log("Sender's certificate is INVALID. Continuing.");
}
reporter?.Log("Verifying file integrity...");
RSACryptoServiceProvider publicKeyProvider = (RSACryptoServiceProvider)cert.PublicKey.Key;
bool verifySuccess = EncryptedFileChecker.VerifySignature(input, publicKeyProvider.ExportParameters(false));
if (verifySuccess)
{
reporter?.Log("File verification: SUCCESS");
}
else
{
reporter?.Log("File verification: FAILED");
}
reporter?.SetPercentage(25);
}
reporter?.Log("Decrypting file...");
FileDecryptor decryptor = new FileDecryptor(this.currentUser.PrivateKey);
decryptor.Decrypt(input, output, reporter.SetPercentage);
reporter?.Log("File decryption complete.");
}
