On Mon, Apr 28, 2025 at 12:19:50PM -0700, Dave Hansen wrote:
> On 4/28/25 11:38, Eric Biggers wrote:
> > -static int sgx_get_key_hash(const void *modulus, void *hash)
> > -{
> > - struct crypto_shash *tfm;
> > - int ret;
> > -
> > - tfm = crypto_alloc_shash("sha256", 0, CRYPTO_ALG_ASYNC);
> > - if (IS_ERR(tfm))
> > - return PTR_ERR(tfm);
> > -
> > - ret = __sgx_get_key_hash(tfm, modulus, hash);
> > -
> > - crypto_free_shash(tfm);
> > - return ret;
> > -}
>
> Let's just say, theoretically, that there was some future hardware that
> also supported SHA384. There doesn't seem to be a SHA-384 library API.
>
> Would you leave the crypto_shash() in place if that were to be
> happening? Theoretically of course.
I don't see any reason why SHA-384 could not be added in order to
support a CPU feature.
BR, Jarkko
