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<emeb>
Gave up on using the SB_I2C core and did my own in the fabric. Actually ended up being much simpler than the support logic needed for the hard IP.
<emeb>
It's now integrated with an I2S function to emulate a WM8731 codec so I can stream audio data to/from an RPi using unmodified linux kernel drivers.
<agg>
how many luts did you need for it in the end?
<tnt>
unless you have a softcore to drive the SB_I2C/SB_SPI, you're way better off doing your own.
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<emeb>
agg: in a stand-alone test design on ice40 up5k, the I2C port uses only 72 LCs
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<awygle>
if you wanted to do a second-preimage attack on a hash function (one you were pretty sure was shitty) where would you start?
<kc8apf>
I'd have to look up second-preimage attacks
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<awygle>
for a specific x, find y!=x such that H(x)==H(y)
<awygle>
the internet suggests differential cryptanalysis, which i sorta-kinda understand what that means
<sorear>
"differential cryptanalysis" is a giant bag of tricks which I sort of understand in the original context of DES variants but not at all for hashes
<sorear>
made a couple attempts to understand the SHA attack papers, not much progress
<sorear>
structural attacks, if possible, are likely to be easier
<sorear>
second-preimage is _much_ harder than collision, we don't even have a practical second-preimage against MD4
<awygle>
yeah
<awygle>
but in this case it's a garbage security-through-obscurity hash, and i have the key
<awygle>
so idk if that makes it practical or not
<awygle>
prolly i will just brute force it tbh
<sorear>
key?
<sorear>
if this is something like CMAC known-key preimages are trivial
<sorear>
(see the MegaUpload fiasco)
<awygle>
i am not familiar with cma
<awygle>
cmac
<sorear>
how big is the state, and is the update function reversible?