On Wed, Feb 24, 2021 at 11:36 AM Sebastian Huber <sebastian.hu...@embedded-brains.de> wrote: > > On 24/02/2021 19:22, Gedare Bloom wrote: > > > On Wed, Feb 24, 2021 at 6:57 AM Sebastian Huber > > <sebastian.hu...@embedded-brains.de> wrote: > >> This patch set adds the new directives rtems_get_build_hash() and > >> rtems_get_target_hash() which can be used to differentiate test suite > >> results. See also the following discussion: > >> > >> https://lists.rtems.org/pipermail/devel/2020-November/063226.html > >> > >> Sebastian Huber (10): > >> build: Generate build hash > >> rtems: Add rtems_get_build_hash() > >> libtest: Report build hash > >> score: Add _IO_Base64url() > >> score: Add Hash Handler > >> rtems: Add rtems_get_target_hash() > >> Add system initialization step for target hash > >> bsps: Add default rtems_get_target_hash() > >> libtest: Report target hash > >> libtest: Print SHA256 hash in base64url > >> > > Is there a good reason to use SHA256 over a lighter weight algorithm? > > I guess I wonder about the overhead and value of using it. > > > > We don't need cryptographic security here, we just need a reasonably > > non-colliding checksum. The speed of hashing will matter for running > > testsuites. > SHA256 is currently the best algorithm for 32-bit targets we have in the > RTEMS sources. It is also selected for the next Git hash. I don't think > the time to calculate the hash really matters and I want to avoid any > discussions if MD5 is sufficient or not. > OK, from a code existence argument this is fine. I could even see a possibility to fold in the source code hashes in the future to make a "secure" checksum that can be verified at boot-time.
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