phc-discussions - Re: [PHC] Dumb fast file digest idea...

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Date: Wed, 23 Apr 2014 17:48:18 -0400
From: Bill Cox <waywardgeek@...il.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Dumb fast file digest idea...

On Wed, Apr 23, 2014 at 2:33 PM, Bill Cox <waywardgeek@...il.com> wrote:

> I think there are various possibilities for hashing functions like the one
> above.  For example, how about using a large block hash function more
> like:
>
> hashBlock(uint512 block[128], uint1024 state) {
>     state1 = state
>     state2 = state ^ RAND_CONST
>     for(i = 0; i < 128; i++) {
>         state1 = Blake2b_ROUND(state1, block[i])
>         state2 = Blake2b_Inverse_ROUND(state2, block[127-i])
>     }
>     // Full Blake2b hash to combine state1 and state2
>     return Blake2b(Blake2b(state1, low(state2)), high(state2))
> }
>

I coded this for fun, based on Lyra2's modified version of Blake2b.  I'm
not confident it's secure, but it does run fast.  It hashes files almost
3.5 GB/s, or just over 1 byte per clock.  Here's some speed comparisons:

wghash (as I'm calling this hack): 3.48 GB/s
md5sum: 0.72 GB/s
sha256sum: 0.29 GB/s

It's almost 5X faster than md5sum, and 12X faster than sha256sum.  It would
be very cool of something like this works out.

Bill

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