imgtool: Assert "measurement value" is last in boot_record.py

'Measurement Value' added the 'properties' list initially,
rather than adding it separately later.
Added an assertion to ensure 'Measurement Value' remains as
the last item in the 'properties' list

Signed-off-by: Rustam Ismayilov <rustam.ismayilov@arm.com>
Change-Id: I106059c6c903c3d560477d5114d866f48590ad7e

scripts/imgtool/boot_record.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2019-2021, Arm Limited.
+# Copyright (c) 2019-2024, Arm Limited.
 # Copyright (c) 2020, Linaro Limited
 #
 # SPDX-License-Identifier: Apache-2.0
@@ -22,6 +22,7 @@ try:
 except ImportError:
     from cbor import dumps
 
+
 class SwComponent(int, Enum):
     """
     Software component property IDs specified by
@@ -36,17 +37,16 @@ class SwComponent(int, Enum):
 
 def create_sw_component_data(sw_type, sw_version, sw_measurement_description,
                              sw_measurement_value, sw_signer_id):
-
     # List of software component properties (Key ID + value)
-    properties = {
-        SwComponent.TYPE: sw_type,
-        SwComponent.VERSION: sw_version,
-        SwComponent.SIGNER_ID: sw_signer_id,
-        SwComponent.MEASUREMENT_DESCRIPTION: sw_measurement_description,
-    }
+    properties = {SwComponent.TYPE: sw_type,
+                  SwComponent.VERSION: sw_version,
+                  SwComponent.SIGNER_ID: sw_signer_id,
+                  SwComponent.MEASUREMENT_DESCRIPTION: sw_measurement_description,
+                  SwComponent.MEASUREMENT_VALUE: sw_measurement_value,
+                  }
 
     # Note: The measurement value must be the last item of the property
     #       list because later it will be modified by the bootloader.
-    properties[SwComponent.MEASUREMENT_VALUE] = sw_measurement_value
-
+    last_key = list(properties.keys())[-1]
+    assert SwComponent.MEASUREMENT_VALUE == last_key, 'Measurement value is not the last item of the property list'
     return dumps(properties)