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Re: [PATCH v3 3/5] crypto: Add RSA support
- To: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 23 Jun 2025 09:28:50 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 23 Jun 2025 07:29:00 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20.06.2025 18:11, Ross Lagerwall wrote:
> On Fri, Jun 20, 2025 at 10:53 AM Roger Pau Monné <roger.pau@xxxxxxxxxx> wrote:
>>
>> On Mon, Jun 02, 2025 at 02:36:35PM +0100, Ross Lagerwall wrote:
>>> In preparation for adding support for livepatch signing, add support for
>>> RSA crypto.
>>>
>>> The RSA code is extracted from Nettle at tag nettle_3.2_release_20160128
>>> (https://git.lysator.liu.se/nettle/nettle).
>>>
>>> The MPI code is extracted from Linux at commit eef0df6a5953 (lib/mpi/*).
>>>
>>> Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
>>> ---
>>>
>>> In v3:
>>>
>>> * Move mpi.c to lib
>>> * Fix header guard name
>>>
>>> xen/crypto/Makefile | 1 +
>>> xen/crypto/rsa.c | 196 +++++
>>> xen/include/xen/mpi.h | 68 ++
>>> xen/include/xen/rsa.h | 74 ++
>>> xen/lib/Makefile | 1 +
>>> xen/lib/mpi.c | 1729 +++++++++++++++++++++++++++++++++++++++++
>>
>> Just FTAOD: all the functions imported in mpi.c are used I think? So
>> that we don't introduce unreachable code.
>
> Yes, everything included here is used by the end of the patch series.
What about intermediate state? It's conceivable that such a series might go
in piecemeal ...
Jan
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