public void CreateDecorator_FileNotUsable_ReseedsFromEntropy()
{
var decorator = new SeedFileDecorator(_mockProvider, _mockFile);
decorator.InitializePRNG();
_mockProvider.Received(1).InitializePRNG();
_mockFile.DidNotReceive().Read(Arg.Any <byte[]>(), Arg.Any <int>(), Arg.Any <int>());
}
public void CreateDecorator_FileHasEntropy_ReseedsFromFile()
{
_mockFile.Length.Returns(64);
var decorator = new SeedFileDecorator(_mockProvider, _mockFile);
decorator.InitializePRNG();
_mockProvider.DidNotReceive().InitializePRNG();
_mockFile.Received().Read(Arg.Any <byte[]>(), Arg.Any <int>(), Arg.Any <int>());
// Finally, assert that the new seed was generated and placed in the file
_mockFile.Received().Seek(0, SeekOrigin.Begin);
_mockFile.Received().Write(Arg.Any <byte[]>(), 0, 64);
_mockFile.Received().Flush();
}
public void CreateDecorator_SeedsFromFile_ReturnsData()
{
_mockFile.Length.Returns(64);
var generator = new FortunaGenerator();
var accumulator = new FortunaAccumulator(new EntropyEventScheduler(), Enumerable.Empty <IEntropyProvider>());
var decorator = new SeedFileDecorator(new PRNGFortunaProvider(generator, accumulator), _mockFile);
decorator.InitializePRNG();
var data = new byte[1024];
decorator.GetBytes(data);
Assert.NotEqual((IEnumerable <byte>)data, new byte[1024]);
}
public async Task CreateDecoratorAsync_FileHasEntropy_ReseedsFromFile()
{
_mockFile.Length.Returns(64);
var decorator = new SeedFileDecorator(_mockProvider, _mockFile);
await decorator.InitializePRNGAsync();
await _mockProvider.DidNotReceive().InitializePRNGAsync();
await _mockFile.Received().ReadAsync(Arg.Any <byte[]>(), Arg.Any <int>(), Arg.Any <int>(), Arg.Any <CancellationToken>());
// Finally, assert that the new seed was generated and placed in the file
_mockFile.Received().Seek(0, SeekOrigin.Begin);
await _mockFile.Received().WriteAsync(Arg.Any <byte[]>(), 0, 64, Arg.Any <CancellationToken>());
await _mockFile.Received().FlushAsync(Arg.Any <CancellationToken>());
}
