[PATCH v4 08/29] hash: integrate hash on mbedtls

[Raymond Mao]

Hi Simon,

On Fri, 5 Jul 2024 at 04:36, Simon Glass <sjg at chromium.org> wrote:

> Hi,
>
> On Wed, Jul 3, 2024, 09:56 Ilias Apalodimas <ilias.apalodimas at linaro.org>
> wrote:
> >
> > Hi Raymond
> >
> > On Tue, 2 Jul 2024 at 21:27, Raymond Mao <raymond.mao at linaro.org> wrote:
> > >
> > > Integrate common/hash.c on the hash shim layer so that hash APIs
> > > from mbedtls can be leveraged by boot/image and efi_loader.
> > >
> > > Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
> > > ---
> > > Changes in v2
> > > - Use the original head files instead of creating new ones.
> > > Changes in v3
> > > - Add handle checkers for malloc.
> > > Changes in v4
> > > - None.
> > >
> > >  common/hash.c | 143 ++++++++++++++++++++++++++++++++++++++++++++++++++
> > >  1 file changed, 143 insertions(+)
> > >
> > > diff --git a/common/hash.c b/common/hash.c
> > > index ac63803fed9..96caf074374 100644
> > > --- a/common/hash.c
> > > +++ b/common/hash.c
> > > @@ -35,6 +35,141 @@
> > >  #include <u-boot/sha512.h>
> > >  #include <u-boot/md5.h>
> > >
> > > +#if CONFIG_IS_ENABLED(MBEDTLS_LIB_CRYPTO)
> > > +
> > > +static int hash_init_sha1(struct hash_algo *algo, void **ctxp)
> > > +{
> > > +       int ret;
> > > +       mbedtls_sha1_context *ctx =
> malloc(sizeof(mbedtls_sha1_context));
>
>
> Why do we need allocation here? We should avoid it where possible.
>
> The API "hash_init_sha1(struct hash_algo *algo, void **ctxp)" is passing a
pointer
address and expecting to get the context from the pointer, it is reasonable
to do the
allocation.
On top of that, this patch doesn't make changes on this API itself, but
just adapted
it to MbedTLS stacks, thus you can see the allocation is needed by the
original API
as well.

Regards,
Raymond