Hash Functions By Hand

How do I hash data by hand? Bitwise, strings, integers, any tricks you know of to hash numbers quickly or easily with a paper and pen?

Bump. Been interested in this for a while. How does hashing work mathematically?

Semi related, can you perform operations like AND, OR, XOR, etc on any data in a simpler way than reducing it to bits first like 9 XOR 4 -> 1001 XOR 0100 -> 1101 -> 13

iit, we circumvent programming.

>>1-2
Read these, for example, and try to apply what you learn.
http://burtleburtle.net/bob/hash/doobs.html
http://www.azillionmonkeys.com/qed/hash.html
http://unixwiz.net/techtips/iguide-crypto-hashes.html
And here's a short version of the last one:
What's inside a hash?  The first answer is "it depends on the kind of hash", but the second answer usually starts with "a lot of math."

>>3
They're called bitwise operations for a reason.  (Why not just add 9 and 4?)

>>4
Thanks, mate.