I realized that I didn't have any use for the round-reduced Salsa20 stream functions. So I'll focus on what I needed instead, which resulted in a much smaller patch. What do you think? Open issues:
* I'm not particular happy about the name SALSA20_CORE_INOUT_SIZE.
* Where could this be documented in the manual? "Miscellaneous functions"? We could also create a new section "Non-cryptographic Hash functions". There is the FNV and CRC hashes that could be implemented under that umbrella.
/Simon