Add SHA-256 section; clarify the definition of SHA256Compress. Rename SHA-256 and hash-box macros. fixes #100
Add SHA-256 section; clarify the definition of SHA256Compress.
Rename SHA-256 and hash-box macros.
fixes #100

Signed-off-by: Daira Hopwood <cd7d43d5556a38ce626d53826fddc46adc597539@jacaranda.org>

zcash/zips,zcash/zips,zcash/zips,zcash/zips