On Tue, 17 Dec 2019 at 01:53, AKASHI Takahiro takahiro.akashi@linaro.org wrote:
In the current implementation of FIT_SIGNATURE, five parameters for a RSA public key are required while only two of them are essential. (See rsa-mod-exp.h and uImage.FIT/signature.txt) This is a result of considering relatively limited computer power and resources on embedded systems, while such a assumption may not be quite practical for other use cases.
In this patch, added is a function, rsa_gen_key_prop(), which will generate additional parameters for other uses, in particular UEFI secure boot, on the fly.
Note: the current code uses some "big number" routines from BearSSL for the calculation.
Signed-off-by: AKASHI Takahiro takahiro.akashi@linaro.org
include/u-boot/rsa-mod-exp.h | 23 ++ lib/rsa/Kconfig | 3 + lib/rsa/Makefile | 1 + lib/rsa/rsa-keyprop.c | 725 +++++++++++++++++++++++++++++++++++ 4 files changed, 752 insertions(+) create mode 100644 lib/rsa/rsa-keyprop.c
Reviewed-by: Simon Glass sjg@chromium.org
I think it would help to have the change log in each patch as well as the cover letter. If you use patman it will do this for you.