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46 lines
2.1 KiB
Python
46 lines
2.1 KiB
Python
# Created by Deltaion Lee (MCMi460) on Github
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# Convert `friendCode` into `principalId`
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# This method took two weeks to figure out and five minutes to code
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# Thank you, https://www.3dbrew.org/wiki/Principal_ID
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# for essentially making my efforts have worth
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# I would kiss Meleemeister (https://www.3dbrew.org/wiki/Special:Contributions/Meleemeister)
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import hashlib
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botFC = str(233790548638).zfill(12) # FC == Friendcode
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class FriendCodeValidityError(Exception):
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pass
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class PrincipalIDValidityError(Exception):
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pass
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def convertFriendCodeToPrincipalId(friendCode:str) -> int:
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friendCode = ''.join(filter(str.isdigit, str(friendCode)))
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if len(friendCode) != 12: raise FriendCodeValidityError('an invalid friend code was passed') # Remove chances of friendCode being invalid
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checksumPrincipal = str(hex(int(friendCode))) # Convert friendCode into hexadecimal
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principalId = int(checksumPrincipal[4:], 16) # Remove most significant byte and convert to integer
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checksumByte = hex(int(checksumPrincipal[2:][:2], 16)) # Separate checksum from checksumPrincipal
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if not checkPrincipalIdValidity(checksumByte, principalId): raise FriendCodeValidityError('an invalid friend code was passed')
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return principalId
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def checkPrincipalIdValidity(checksumByte:int, principalId:int) -> bool:
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return generateChecksumByte(principalId) == checksumByte # Check to match
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def generateChecksumByte(principalId:int) -> str: # https://www.3dbrew.org/wiki/FRDU:PrincipalIdToFriendCode
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sha1 = hashlib.sha1(principalId.to_bytes(4, byteorder = 'little')) # Little endian sha1 of principalId
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return hex(int(sha1.hexdigest()[:2], 16) >> 1) # Shift first byte to the right by one
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def convertPrincipalIdtoFriendCode(principalId:int) -> int:
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if not isinstance(principalId, int): raise PrincipalIDValidityError('an invalid principal id was passed')
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checksumByte = generateChecksumByte(principalId)
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friendCode = checksumByte + hex(principalId)
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return int(friendCode.replace('0x',''), 16)
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# Structure of a friendCode:
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#
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# (0x__ << 32) | 0x________
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# Checksum PrincipalID
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#
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