/// <inhertitdoc />
public async Task <AuthenticationResult> AuthenticateAsync(IAuthenticationHandler authenticationHandler, CancellationToken cancellationToken = default)
{
if (authenticationHandler == null)
{
throw new ArgumentNullException(nameof(authenticationHandler));
}
cancellationToken.ThrowIfCancellationRequested();
ITransport transport = _context.Transport ?? throw new InvalidOperationException("Cannot access transport for authentication.");
// Read challenge
ReadOnlyMemory <byte> challengeBytes = await transport.Stream.ReadAllAsync(16, cancellationToken).ConfigureAwait(false);
// Request password input
PasswordAuthenticationInput input = await authenticationHandler
.ProvideAuthenticationInputAsync(_context.Connection, this, new PasswordAuthenticationInputRequest()).ConfigureAwait(false);
ReadOnlyMemory <byte> passwordBytes = Encoding.UTF8.GetBytes(input.Password);
// Calculate response
ReadOnlyMemory <byte> response = CreateChallengeResponse(challengeBytes, passwordBytes);
// Send response
Debug.Assert(response.Length == 16, "response.Length == 16");
await transport.Stream.WriteAsync(response, cancellationToken).ConfigureAwait(false);
return(new AuthenticationResult());
}