[Cryptech Tech] SHA-3 and Ed25519

[Bernd Paysan]

Am Freitag, 6. März 2015, 02:17:39 schrieb Bernd Paysan:
> The synthesis report gives me 5161 LUTs and 1610 registers.  1600 of those
> LUTs are just to implement the input^state thing, which seems a bit
> obsessive to me.  If I wouldn't do input^state to facilitate hashing, but
> just state <= input, I would use only ~3500 LUTs.  Maybe using a direct bus
> input could remove that overhead; I'll try tomorrow (so you would have two
> register addresses writing to each 32 bit word of the state, one would give
> you a direct write, the other an xor).

Ok, second version with the bus interface integrated.  That's now 4784 
LUTs+1610 regs (with a 16 bit bus), and two mappings: The first one is direct 
write, the second one xor to the state.  Write the number of rounds into the 
last address to get going.

The bus is configurable for 16, 32 or 64 bits.

-- 
Bernd Paysan
"If you want it done right, you have to do it yourself"
http://bernd-paysan.de/
net2o ID: kQusJzA;7*?t=uy at X}1GWr!+0qqp_Cn176t4(dQ*
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