[beken-72xx] Disable OTA encryption

boards/_base/beken-72xx.json

@@ -3,10 +3,8 @@
 		"f_cpu": "120000000L",
 		"prefix": "arm-none-eabi-",
 		"bkota": {
-			"encryption": "aes256",
-			"compression": "gzip",
-			"key": "0123456789ABCDEF0123456789ABCDEF",
-			"iv": "0123456789ABCDEF"
+			"encryption": "none",
+			"compression": "gzip"
 		}
 	},
 	"connectivity": [

builder/frameworks/beken-72xx-sdk.py

@@ -2,17 +2,12 @@
 
 from os.path import join
 
+from ltchiptool.soc.bk72xx.binary import to_offset
 from SCons.Script import Builder, DefaultEnvironment
 
 env = DefaultEnvironment()
 board = env.BoardConfig()
 
-# Install PyCryptodome for OTA packaging with AES
-try:
-    import Cryptodome
-except ImportError:
-    env.Execute("$PYTHONEXE -m pip install pycryptodomex")
-
 ROOT_DIR = join("$SDK_DIR", "beken378")
 APP_DIR = join(ROOT_DIR, "app")
 DRIVER_DIR = join(ROOT_DIR, "driver")
@@ -567,8 +562,8 @@ env.Replace(
 # Calculate RBL header offset
 app_offs = int(env["FLASH_APP_OFFSET"], 16)
 app_size = int(board.get("build.bkrbl_size_app"), 16)
-rbl_offs = int(app_size // 32 * 34) - 102
-env.Replace(FLASH_RBL_OFFSET=f"0x{app_offs + rbl_offs:06X}")
+rbl_offs = app_offs + to_offset(app_size) - 102
+env.Replace(FLASH_RBL_OFFSET=f"0x{rbl_offs:06X}")
 
 # Build all libraries
 env.BuildLibraries()