sha-1 encription routine

[colinbroad]

Status: Alpha
License: GPL

Standard sha-1 encryption routine for xmos chip, The current version supports a sigle pass that will handle up to 64 bytes but I can finish it to allow any message size if there is interest.
The routine implements version 2, minimum memory usage. My current application uses a 64 byte salt before a 32 byte challenge and writing my own routine allowed me to pre encode the salt.