lib: rsa: generate additional parameters for public key
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>
diff --git a/lib/rsa/Makefile b/lib/rsa/Makefile
index c073051..14ed3cb 100644
--- a/lib/rsa/Makefile
+++ b/lib/rsa/Makefile
@@ -6,4 +6,5 @@
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
obj-$(CONFIG_$(SPL_)RSA_VERIFY) += rsa-verify.o rsa-checksum.o
+obj-$(CONFIG_RSA_VERIFY_WITH_PKEY) += rsa-keyprop.o
obj-$(CONFIG_RSA_SOFTWARE_EXP) += rsa-mod-exp.o