On 4/27/19 7:31 AM, Paolo Bonzini wrote:
I've done porting linux's pkcs7/x509 parsers and they work well
with my UEFI secure boot patch, but I'm still looking for other options
as well.
* openssl
Most of existing components linked to UEFI secure boot, including
EDK2, shim and grub, reply on this library. Why not for U-Boot?
The size of U-Boot UEFI code in U-Boot is already quite big, and
so the size of openssl won't be a big issue.
* mbedTLS
which is maintained by ARM and used with Zephyr, I guess it should
have small footprint. But it currently lacks pkcs7 parser.
Any thoughts?
Paolo, Laszlo, Ard, if you could write a new secure boot implementation
today, which of the options above would you pick and why so? :)
Difficult question. Ideally you'd want a library where three aspects met:
- widely used (so that there is a diverse community that's interested in
vulnerabilities, and fixing them too)
- easy to cross-compile for your free-standing environment (optimally
the upstream project would support being cross-compiled and packaged
stand-alone, for that free-standing environment)
- cares about API stability
OpenSSL is very widely used...
...and that's where we can stop in the list :)
It's also license-incompatible with U-Boot's GPLv2 I think. I guess
grub can use it because GPLv3 and Apache v2 can be combined just fine.
Reusing Linux's code seems like the best match.
Paolo
You could have a look at GnuTLS available at
https://gitlab.com/gnutls/gnutls/ .
PKCS7 is supported, cf.
https://www.gnutls.org/manual/html_node/PKCS-7-API.html
There seem to be four main contributors to GnuTLS adding two patches a day:
https://github.com/gnutls/gnutls/graphs/contributors?from=2018-04-28&to=2019-04-27&type=a
Best regards
Heinrich
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