Script to calculate hash of a GOF2 save file hash

gof2_inventory_hash.py

import hashlib

# read file data as bytes
file = open("gof2_save_game_", "rb+")
data = file.read()

def calculate_hash(data) -> bytes:
    # secret key to calculate the hash
    key = b"#+\xc2\xa7R0LL3r(0aSter&_%=$+#\x00"
    
    # create hash object 
    hash = hashlib.sha256()
    # Update hash with the save by excluding old hash
    hash.update(data[:-32])
    # Update hash with the secret key
    hash.update(key)
    
    # return the hash
    return hash.digest()

# seek to the end of the file before hash
file.seek(len(data)-32)
# write the hash
file.write(calculate_hash(data))
file.close()