private Stream CreateEncryptedDataStream()
{
if (_reader.CurrentItemType != AxCryptItemType.Data)
{
throw new InvalidOperationException("An attempt was made to create an encrypted data stream when the reader is not positioned at the data.");
}
_reader.SetStartOfData();
return(V2AxCryptDataStream.Create(_reader, V2HmacStream.Create(DocumentHeaders.HmacCalculator)));
}
public void TestReaderNotPositionedAtData()
{
MemoryStream encryptedFile = new MemoryStream(Resources.david_copperfield_key__aa_ae_oe__ulu_txt);
Headers headers = new Headers();
AxCryptReader reader = headers.CreateReader(new LookAheadStream(encryptedFile));
using (V1AxCryptDocument document = new V1AxCryptDocument(reader))
{
Passphrase key = new Passphrase("Å ä Ö");
bool keyIsOk = document.Load(key, new V1Aes128CryptoFactory().CryptoId, headers);
Assert.That(keyIsOk, Is.True);
reader.SetStartOfData();
Assert.Throws <InvalidOperationException>(() => document.DecryptTo(Stream.Null));
}
}
public void TestDecryptToWithReaderWronglyPositioned()
{
using (MemoryStream inputStream = new MemoryStream())
{
byte[] text = Resolve.RandomGenerator.Generate(1000);
inputStream.Write(text, 0, text.Length);
inputStream.Position = 0;
byte[] buffer = new byte[2500];
using (IAxCryptDocument document = new V2AxCryptDocument(new EncryptionParameters(new V2Aes256CryptoFactory().CryptoId, new Passphrase("passphrase")), 113))
{
document.EncryptTo(inputStream, new MemoryStream(buffer), AxCryptOptions.EncryptWithCompression);
Headers headers = new Headers();
AxCryptReader reader = headers.CreateReader(new LookAheadStream(new MemoryStream(buffer)));
using (V2AxCryptDocument decryptedDocument = new V2AxCryptDocument(reader))
{
Assert.That(decryptedDocument.Load(new Passphrase("passphrase"), new V2Aes256CryptoFactory().CryptoId, headers), Is.True);
reader.SetStartOfData();
Assert.Throws <InvalidOperationException>(() => decryptedDocument.DecryptTo(Stream.Null));
}
}
}
}