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