Created
December 29, 2016 22:43
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Super Mario Run .stir file decrypter
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# fun fact: | |
# this is internally referred to as 'SimpleEncryption' | |
# it is pretty damn simple, really | |
import sys | |
KEY = 0x5D | |
INITIAL_SPAN = 0x200 | |
SPAN = 0x100 | |
input_name = sys.argv[1] | |
if '.stir' in input_name: | |
output_name = input_name.replace('.stir', '') | |
else: | |
output_name = input_name + '_decrypted' | |
with open(input_name, 'rb') as f: | |
work = bytearray(f.read()) | |
first_block_size = min(INITIAL_SPAN, len(work)) | |
value = KEY | |
for i in range(first_block_size): | |
value ^= work[i] | |
work[i] = value | |
offset = first_block_size | |
while offset < len(work): | |
value ^= work[offset] | |
work[offset] = value | |
offset += SPAN | |
with open(output_name, 'wb') as f: | |
f.write(work) |
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Thanks for this!