linux-kernel - Re: [v5 PATCH 7/7] crypto: stm32 - Save and restore between each request

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Date:   Tue, 7 Mar 2023 16:31:44 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Lionel Debieve <lionel.debieve@...s.st.com>,
        Li kunyu <kunyu@...china.com>, davem@...emloft.net,
        linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com, mcoquelin.stm32@...il.com
Subject: Re: [v5 PATCH 7/7] crypto: stm32 - Save and restore between each request

On Tue, Mar 7, 2023 at 11:10 AM Herbert Xu <herbert@...dor.apana.org.au> wrote:
> On Mon, Mar 06, 2023 at 11:08:13AM +0100, Linus Walleij wrote:
> >
> > This partly works (after my folded in fix in patch 5)!
> >
> > Clean SHA1 and SHA256 works flawlessly.
> > HMAC still fails, but not until we start testing random vectors:
> >
> > [    7.541954] alg: ahash: stm32-hmac-sha256 digest() failed on test
> > vector "random: psize=0 ksize=80"; expected_error=0,
> > actual_error=-110, cfg="random: may_sleep"
> > [    7.567212] alg: self-tests for hmac(sha256) using
> > stm32-hmac-sha256 failed (rc=-110)
>
> So it's timing out.  I wonder if the timeout in stm32_hash_wait_busy
> is long enough.  Perhaps try adding a zero so that the timeout becomes
> 100,000us and see if it still breaks?

Sadly this doesn't work.

I tried increasing with one and even two orders of magnitude,
but the timeouts still happen, usually two of them, sometimes
one sometimes three, depending on randomness, as can be
expected.

I think you mentioned something about that we need to store
the key in the state as well though?

Yours,
Linus Walleij