Dan, Dan, Dan.
Please, break out your browser, and start to use Google:
http://en.wikipedia.org/wiki/Base64[
^]
Base 64 is not a hashing algorithm. It is a way of translating data so that is can be reliably transported over non-binary communications links: like converting the byte value 243 (hex: F3) to a two character string "F3", only a lot more efficient since it breaks a stream of 8 bit bytes into 5 bit values and converts them into printable characters.