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buildroot/share/PlatformIO/scripts/lerdge.py

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+#
+# buildroot/share/PlatformIO/scripts/lerdge.py
+# Customizations for Lerdge build environments:
+#   env:LERDGEX  env:LERDGEX_usb_flash_drive
+#   env:LERDGES  env:LERDGES_usb_flash_drive
+#   env:LERDGEK  env:LERDGEK_usb_flash_drive
+#
+import os,marlin
+Import("env")
+
+from SCons.Script import DefaultEnvironment
+board = DefaultEnvironment().BoardConfig()
+
+def encryptByte(byte):
+    byte = 0xFF & ((byte << 6) | (byte >> 2))
+    i = 0x58 + byte
+    j = 0x05 + byte + (i >> 8)
+    byte = (0xF8 & i) | (0x07 & j)
+    return byte
+
+def encrypt_file(input, output_file, file_length):
+    input_file = bytearray(input.read())
+    for i in range(len(input_file)):
+        result = encryptByte(input_file[i])
+        input_file[i] = result
+
+    output_file.write(input_file)
+    return
+
+# Encrypt ${PROGNAME}.bin and save it as build.firmware
+def encrypt(source, target, env):
+    print("Encrypting to:", board.get("build.firmware"))
+    firmware = open(target[0].path, "rb")
+    renamed = open(target[0].dir.path + "/" + board.get("build.firmware"), "wb")
+    length = os.path.getsize(target[0].path)
+
+    encrypt_file(firmware, renamed, length)
+
+    firmware.close()
+    renamed.close()
+
+if 'firmware' in board.get("build").keys():
+  marlin.add_post_action(encrypt);
+else:
+  print("You need to define output file via board_build.firmware = 'filename' parameter")
+  exit(1);