I am bit-wise logical operations in Bro script?

In the DNP3 protocol analyzer that I am writing, I need to check some
certain byte value (or even single bit) within the parsed field. It will be
easy to do that if we have bitwise logical operator.

Note, the usual idiom for doing this sort of thing would be to have the
analyzer code (i.e., the C++/BinPAC that handles the parsing) break out
the fields and make them available directly to the scripting layer, such
as via a record. Generally the only reason not to do that is if it would
be too messy.