Wanted : functions to convert hex & bin strings tp numbers.

Hello World,

although to subject is reasonably clear ( I hope ? )
some in depth problem info :

i want to convert strings to numbers :
the strings have the following specs:
hexstring holds chars 0 to F .
example : "F4" or "A73BC7823F1256E1" (maybe even longer)
bin string holds chars 0 and 1.
example : "0100010011110010101010010101010100010101010" maxleght currently 80 chars.

I want to AND or OR or XOR etc two hexstrings or two binstrings.

solutions might be :
- be converting to long and do the operation
- do the operation at the strings it self

Anyone around made something like this already (if possible documented)
and willing to share this with the rest of the VB-world ?

Greetinx,

D