boot: zephyr: kconfig: Only show signature file when needed

Hides this Kconfig option when the operating mode is set to
work as hash only without signature

Signed-off-by: Jamie McCrae <[email protected]>

Author: thedjnK

boot/zephyr/CMakeLists.txt

@@ -338,7 +338,7 @@ if(CONFIG_MCUBOOT_SERIAL)
   endif()
 endif()
 
-if(NOT CONFIG_BOOT_SIGNATURE_KEY_FILE STREQUAL "")
+if(NOT CONFIG_BOOT_SIGNATURE_TYPE_NONE AND NOT CONFIG_BOOT_SIGNATURE_KEY_FILE STREQUAL "")
   set(key_file "${CONFIG_BOOT_SIGNATURE_KEY_FILE}")
   string(CONFIGURE "${key_file}" key_file)
 

boot/zephyr/Kconfig

@@ -391,6 +391,7 @@ config BOOT_BYPASS_KEY_MATCH
 
 config BOOT_SIGNATURE_KEY_FILE
 	string "PEM key file"
+	depends on !BOOT_SIGNATURE_TYPE_NONE
 	default "root-ec-p256.pem" if BOOT_SIGNATURE_TYPE_ECDSA_P256
 	default "root-ed25519.pem" if BOOT_SIGNATURE_TYPE_ED25519
 	default "root-rsa-3072.pem" if BOOT_SIGNATURE_TYPE_RSA && BOOT_SIGNATURE_TYPE_RSA_LEN=3072