linux-kernel - Re: [PATCH 3/8] crypto: stm32/cryp

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Date:   Tue, 2 Nov 2021 12:12:20 +0100
From:   Nicolas Toromanoff <nicolas.toromanoff@...s.st.com>
To:     Ard Biesheuvel <ardb@...nel.org>
CC:     Nicolas Toromanoff <nicolas.toromanoff@...s.st.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Marek Vasut <marex@...x.de>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/8] crypto: stm32/cryp - fix CTR counter carry



On Sun, 31 Oct 2021, Ard Biesheuvel wrote:

> On Fri, 29 Oct 2021 at 16:01, Nicolas Toromanoff
> <nicolas.toromanoff@...s.st.com> wrote:
>>
>> [...]
>>
>> @@ -1219,25 +1219,26 @@ static void stm32_cryp_check_ctr_counter(struct stm32_cryp *cryp)
>>
>>         if (unlikely(cryp->last_ctr[3] == 0xFFFFFFFF)) {
>>                 cryp->last_ctr[3] = 0;
>> -               cryp->last_ctr[2]++;
>> +               cryp->last_ctr[2] = cpu_to_be32(be32_to_cpu(cryp->last_ctr[2]) + 1);
>>                 if (!cryp->last_ctr[2]) {
>> -                       cryp->last_ctr[1]++;
>> +                       cryp->last_ctr[1] = cpu_to_be32(be32_to_cpu(cryp->last_ctr[1]) + 1);
>>                         if (!cryp->last_ctr[1])
>> -                               cryp->last_ctr[0]++;
>> +                               cryp->last_ctr[0] = cpu_to_be32(be32_to_cpu(cryp->last_ctr[0]) + 1);
>>                 }
>>
>
> crypto_inc() ??

Good point, I didn't know/find this function.

Thanks,
Nicolas.