[PATCH v8 06/15] lib: rsa: allow rsa verify with pkey in SPL

[Philippe Reynes <philippe.reynes@softathome.com>]

This commit adds the option SPL_RSA_VERIFY_WITH_PKEY.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
---
 lib/rsa/Kconfig | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/lib/rsa/Kconfig b/lib/rsa/Kconfig
index be9775bcce..b773f17c26 100644
--- a/lib/rsa/Kconfig
+++ b/lib/rsa/Kconfig
@@ -47,6 +47,25 @@ config RSA_VERIFY_WITH_PKEY
 	  directly specified in image_sign_info, where all the necessary
 	  key properties will be calculated on the fly in verification code.
 
+config SPL_RSA_VERIFY_WITH_PKEY
+	bool "Execute RSA verification without key parameters from FDT within SPL"
+	depends on SPL
+	select SPL_RSA_VERIFY
+	select SPL_ASYMMETRIC_KEY_TYPE
+	select SPL_ASYMMETRIC_PUBLIC_KEY_SUBTYPE
+	select SPL_RSA_PUBLIC_KEY_PARSER
+	help
+	  The standard RSA-signature verification code (FIT_SIGNATURE) uses
+	  pre-calculated key properties, that are stored in fdt blob, in
+	  decrypting a signature.
+	  This does not suit the use case where there is no way defined to
+	  provide such additional key properties in standardized form,
+	  particularly UEFI secure boot.
+	  This options enables RSA signature verification with a public key
+	  directly specified in image_sign_info, where all the necessary
+	  key properties will be calculated on the fly in verification code
+	  in the SPL.
+
 config RSA_SOFTWARE_EXP
 	bool "Enable driver for RSA Modular Exponentiation in software"
 	depends on DM
-- 
2.25.1