Improve stub_keystore configuration

It is possible to either set the keyfile locations in board configuration or
with the same environment variables as before.

Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>

boards/px4/fmu-v5/cryptotest.px4board

@@ -0,0 +1,5 @@
+CONFIG_BOARD_CRYPTO=y
+CONFIG_DRIVERS_SW_CRYPTO=y
+CONFIG_DRIVERS_STUB_KEYSTORE=y
+CONFIG_PUBLIC_KEY0="../../../Tools/test_keys/key0.pub"
+CONFIG_PUBLIC_KEY1="../../../Tools/test_keys/rsa2048.pub"

src/drivers/stub_keystore/CMakeLists.txt

@@ -36,34 +36,33 @@ px4_add_library(keystore_backend stub_keystore.c)
 
 target_include_directories(keystore_backend PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 
-if(DEFINED ENV{PUBLIC_KEY0})
+# Parse keyfile locations from boardconfig
-	add_definitions(-DPUBLIC_KEY0=$ENV{PUBLIC_KEY0})
+
+# If the key file path is defined in environment variable, use it from there
+# else, if it is hardcoded in CONFIG_PUBLIC_KEYx, use that
+
+file(STRINGS ${BOARD_CONFIG} ConfigContents)
+foreach(NameAndValue ${ConfigContents})
+# Strip leading spaces
+    string(REGEX REPLACE "^[ ]+" "" NameAndValue ${NameAndValue})
+
+    # Find variable name
+    string(REGEX MATCH "^CONFIG_PUBLIC_KEY[^=]+" Name ${NameAndValue})
+
+	if(Name)
+	  string(REPLACE "${Name}=" "" Value ${NameAndValue})
+	  string(REPLACE "\"" "" Value ${Value})
+
+	  # Strip CONFIG_
+	  string(REPLACE "CONFIG_" "" Name ${Name})
+
+	  # Get the value from env variable, if set
+	  if(DEFINED ENV{${Name}})
+		set(Value $ENV{${Name}})
 	  endif()
 
-if(DEFINED ENV{PUBLIC_KEY1})
+	  if(NOT Value STREQUAL "")
-	add_definitions(-DPUBLIC_KEY1=$ENV{PUBLIC_KEY1})
+		add_definitions(-D${Name}=${Value})
 	  endif()
-
-if(DEFINED ENV{PUBLIC_KEY2})
-	add_definitions(-DPUBLIC_KEY2=$ENV{PUBLIC_KEY2})
-endif()
-
-if(DEFINED ENV{PUBLIC_KEY3})
-	add_definitions(-DPUBLIC_KEY3=$ENV{PUBLIC_KEY3})
-endif()
-
-if(DEFINED ENV{PUBLIC_KEY4})
-	add_definitions(-DPUBLIC_KEY4=$ENV{PUBLIC_KEY4})
-endif()
-
-if(DEFINED ENV{PUBLIC_KEY5})
-	add_definitions(-DPUBLIC_KEY5=$ENV{PUBLIC_KEY5})
-endif()
-
-if(DEFINED ENV{PUBLIC_KEY6})
-	add_definitions(-DPUBLIC_KEY6=$ENV{PUBLIC_KEY6})
-endif()
-
-if(DEFINED ENV{PUBLIC_KEY7})
-	add_definitions(-DPUBLIC_KEY7=$ENV{PUBLIC_KEY7})
 	endif()
+endforeach()

src/drivers/stub_keystore/Kconfig

@@ -1,6 +1,24 @@
+menu "stub_keystore configuration"
 	menuconfig DRIVERS_STUB_KEYSTORE
 	bool "stub_keystore"
 	depends on DRIVERS_SW_CRYPTO
 	default n
 	---help---
 		Enable support for stub_keystore
+
+	menuconfig PUBLIC_KEY0
+	string "Path to public key 0"
+	depends on DRIVERS_STUB_KEYSTORE
+
+	menuconfig PUBLIC_KEY1
+	string "Path to public key 1"
+	depends on DRIVERS_STUB_KEYSTORE
+
+	menuconfig PUBLIC_KEY2
+	string "Path to public key 2"
+	depends on DRIVERS_STUB_KEYSTORE
+
+	menuconfig PUBLIC_KEY3
+	string "Path to public key 3"
+	depends on DRIVERS_STUB_KEYSTORE
+endmenu