private static bool CanReadNtlmMessage(ReadOnlyMemory <byte> ntlm, out byte[] actualSignature, out BinaryReader reader, out AsnReader asnReader)
{
asnReader = null;
reader = new BinaryReader(new MemoryStream(ntlm.ToArray()));
actualSignature = reader.ReadBytes(MessageSignature.Length);
if (actualSignature.SequenceEqual(MessageSignature))
{
return(true);
}
asnReader = new AsnReader(ntlm, AsnEncodingRules.DER);
var peekTag = asnReader.PeekTag();
if (AsnReader.IsExpectedTag(peekTag, GssApplicationTag, UniversalTagNumber.Sequence))
{
return(false);
}
return(AsnReader.IsExpectedTag(peekTag, NtlmContextTag, UniversalTagNumber.Sequence));
}