[U-Boot] [RFC 1/3] lib: rsa: decouple rsa from FIT image verification

[AKASHI Takahiro]

On Fri, Sep 06, 2019 at 09:39:05AM +0200, Heinrich Schuchardt wrote:
> On 9/6/19 9:08 AM, AKASHI Takahiro wrote:
> >Introduce new configuration, CONFIG_RSA_VERIFY which will decouple building
> >RSA functions from FIT verification and allow for adding a RSA-based
> >signature verification for other file formats, in particular PE file
> >for UEFI secure boot.
> >
> >Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> >---
> >  lib/rsa/Kconfig  | 7 +++++++
> >  lib/rsa/Makefile | 2 +-
> >  2 files changed, 8 insertions(+), 1 deletion(-)
> >
> >diff --git a/lib/rsa/Kconfig b/lib/rsa/Kconfig
> >index 2b33f323bccc..338c8124da59 100644
> >--- a/lib/rsa/Kconfig
> >+++ b/lib/rsa/Kconfig
> >@@ -1,5 +1,6 @@
> >  config RSA
> >  	bool "Use RSA Library"
> >+	select RSA_VERIFY
> >  	select RSA_FREESCALE_EXP if FSL_CAAM && !ARCH_MX7 && !ARCH_MX6 && !ARCH_MX5
> >  	select RSA_SOFTWARE_EXP if !RSA_FREESCALE_EXP
> >  	help
> >@@ -17,6 +18,12 @@ if RSA
> >
> >  config SPL_RSA
> >  	bool "Use RSA Library within SPL"
> >+	select RSA_VERIFY
> >+
> >+config RSA_VERIFY
> >+	bool
> >+	help
> >+	  Add RSA signature verification support.
> >
> >  config RSA_SOFTWARE_EXP
> >  	bool "Enable driver for RSA Modular Exponentiation in software"
> >diff --git a/lib/rsa/Makefile b/lib/rsa/Makefile
> >index a51c6e1685fb..226d8f3514a9 100644
> >--- a/lib/rsa/Makefile
> >+++ b/lib/rsa/Makefile
> >@@ -5,5 +5,5 @@
> >  # (C) Copyright 2000-2007
> >  # Wolfgang Denk, DENX Software Engineering, wd at denx.de.
> >
> >-obj-$(CONFIG_$(SPL_)FIT_SIGNATURE) += rsa-verify.o rsa-checksum.o
> >+obj-$(CONFIG_RSA_VERIFY) += rsa-verify.o rsa-checksum.o
> >  obj-$(CONFIG_RSA_SOFTWARE_EXP) += rsa-mod-exp.o
> >
> 
> pine64-lts_defconfig with CONFIG_RSA=y
> compiles fine without this patch. But with this patch:

Right.
It seems that include/image.h will also have to be modified.

Thanks,
-Takahiro Akashi


> lib/rsa/rsa-verify.c:60:5: error: redefinition of ‘padding_pkcs_15_verify’
>    60 | int padding_pkcs_15_verify(struct image_sign_info *info,
>       |     ^~~~~~~~~~~~~~~~~~~~~~
> In file included from lib/rsa/rsa-verify.c:21:
> include/u-boot/rsa.h:118:19: note: previous definition of
> ‘padding_pkcs_15_verify’ was here
>   118 | static inline int padding_pkcs_15_verify(struct image_sign_info
> *info,
>       |                   ^~~~~~~~~~~~~~~~~~~~~~
> lib/rsa/rsa-verify.c:399:5: error: redefinition of ‘rsa_verify’
>   399 | int rsa_verify(struct image_sign_info *info,
>       |     ^~~~~~~~~~
>   CC      lib/efi_loader/efi_hii.o
> In file included from lib/rsa/rsa-verify.c:21:
> include/u-boot/rsa.h:111:19: note: previous definition of ‘rsa_verify’
> was here
>   111 | static inline int rsa_verify(struct image_sign_info *info,
>       |                   ^~~~~~~~~~
> 
> Best regards
> 
> Heinrich