Re: [PATCH 3/8] crypto: stm32/cryp - fix CTR counter carry

[Nicolas Toromanoff <nicolas.toromanoff@xxxxxxxxxxx>]

On Sun, 31 Oct 2021, Ard Biesheuvel wrote:

> On Fri, 29 Oct 2021 at 16:01, Nicolas Toromanoff
> <nicolas.toromanoff@xxxxxxxxxxx> 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.