public void Test_Attachment_DecryptFailOnBadKey()
{
string?cipherFile = null;
bool hitCorrectException = false;
try
{
byte[] key = Util.GetSecretBytes(64);
byte[] plaintextInput = Encoding.UTF8.GetBytes("Gwen Stacy");
EncryptResult encryptResult = EncryptData(plaintextInput, key);
byte[] badKey = new byte[64];
cipherFile = WriteToFile(encryptResult.ciphertext);
using FileStream fileStream = File.Open(cipherFile, FileMode.Open);
AttachmentCipherInputStream.CreateForAttachment(fileStream, plaintextInput.Length, badKey, encryptResult.digest);
}
catch (InvalidMessageException)
{
hitCorrectException = true;
}
finally
{
if (cipherFile != null)
{
DeleteFile(cipherFile);
}
}
Assert.IsTrue(hitCorrectException);
}
public void Test_Attachment_EncryptDecryptEmpty()
{
byte[] key = Util.GetSecretBytes(64);
byte[] plaintextInput = Encoding.UTF8.GetBytes(string.Empty);
EncryptResult encryptResult = EncryptData(plaintextInput, key);
string cipherFile = WriteToFile(encryptResult.ciphertext);
using Stream inputStream = AttachmentCipherInputStream.CreateForAttachment(File.Open(cipherFile, FileMode.Open), plaintextInput.Length, key, encryptResult.digest);
byte[] plaintextOutput = ReadInputStreamFully(inputStream);
CollectionAssert.AreEqual(plaintextInput, plaintextOutput);
DeleteFile(cipherFile);
}
/// <summary>
/// Retrieves a SignalServiceAttachment
/// </summary>
/// <param name="pointer">The <see cref="SignalServiceAttachmentPointer"/>
/// received in a <see cref="SignalServiceDataMessage"/></param>
/// <param name="destination">The download destination for this attachment.</param>
/// <param name="maxSizeBytes"></param>
/// <param name="listener">An optional listener (may be null) to receive callbacks on download progress.</param>
/// <param name="token"></param>
/// <exception cref="IOException"></exception>
/// <exception cref="InvalidMessageException"></exception>
public async Task <Stream> RetrieveAttachmentAsync(SignalServiceAttachmentPointer pointer, Stream destination, int maxSizeBytes, IProgressListener?listener, CancellationToken?token = null)
{
if (token == null)
{
token = CancellationToken.None;
}
if (pointer.Digest == null)
{
throw new InvalidMessageException("No attachment digest!");
}
await socket.RetrieveAttachmentAsync(pointer.CdnNumber, pointer.RemoteId, destination, maxSizeBytes, listener, token);
destination.Position = 0;
return(AttachmentCipherInputStream.CreateForAttachment(destination, pointer.Size != null ? pointer.Size.Value : 0, pointer.Key, pointer.Digest));
}
public void Test_Attachment_EncryptDecryptMultipleTimes()
{
// Test that the file passed to AttachmentCipherInputStream can be reused.
byte[] key = Util.GetSecretBytes(64);
byte[] plaintextInput = Encoding.UTF8.GetBytes("Peter Parker");
EncryptResult encryptResult = EncryptData(plaintextInput, key);
string cipherFile = WriteToFile(encryptResult.ciphertext);
for (int i = 0; i < 10; i++)
{
using Stream inputStream = AttachmentCipherInputStream.CreateForAttachment(File.Open(cipherFile, FileMode.Open), plaintextInput.Length, key, encryptResult.digest);
byte[] plaintextOutput = ReadInputStreamFully(inputStream);
CollectionAssert.AreEqual(plaintextInput, plaintextOutput);
}
DeleteFile(cipherFile);
}