Re: [PATCH v9 3/7] crypto: move curve_id of ECDH from the key to algorithm name

[yumeng]

在 2021/2/23 18:44, Tudor.Ambarus@xxxxxxxxxxxxx 写道:
> Hi,
>
> On 2/23/21 9:10 AM, Meng Yu wrote:
> > --- a/drivers/crypto/atmel-ecc.c
> > +++ b/drivers/crypto/atmel-ecc.c
> > @@ -104,7 +104,7 @@ static int atmel_ecdh_set_secret(struct crypto_kpp *tfm, const void *buf,
> >                  return -EINVAL;
> >          }
> >
> > -       ctx->n_sz = atmel_ecdh_supported_curve(params.curve_id);
> > +       ctx->n_sz = atmel_ecdh_supported_curve(ctx->curve_id);
> >          if (!ctx->n_sz || params.key_size) {
> >                  /* fallback to ecdh software implementation */
> >                  ctx->do_fallback = true;
>
> Now that you moved the curve id info into the alg name, and it is
> no longer dynamically discovered when decoding the key, does it
> still make sense to keep the curve id, the key size checks, and
> the fallback to the software implementation?
> I think we can keep the curve id, the key size check if 'atmel-ecc' may
support other curves in the future, and if you're sure P256 is the only
curve 'atmel-ecc' uses, and it will be changed, we can delete it.

And fallback to ecdh software implementation is needed when
params.key_size is zero.

> I don't have an atecc508 at hand to test the changes, but I expect
> your changes won't affect the functionality.

OK, if you or your team members have an atecc508, please help test.