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https://www.python.org/dev/peps/pep-0585/ - Type Hinting Generics In Standard Collections https://www.python.org/dev/peps/pep-0604/ - Allow writing union types as X | Y
40 lines
1.1 KiB
Python
40 lines
1.1 KiB
Python
from trezor.crypto.slip39 import Share
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from trezor.messages import BackupType
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if False:
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from trezor.messages.ResetDevice import EnumTypeBackupType
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_BIP39_WORD_COUNTS = (12, 18, 24)
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_SLIP39_WORD_COUNTS = (20, 33)
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def is_slip39_word_count(word_count: int) -> bool:
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"""
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Returns True for SLIP-39 and False for BIP-39.
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Raise RuntimeError otherwise.
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"""
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if word_count in _SLIP39_WORD_COUNTS:
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return True
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elif word_count in _BIP39_WORD_COUNTS:
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return False
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# Unknown word count.
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raise RuntimeError
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def is_slip39_backup_type(backup_type: EnumTypeBackupType) -> bool:
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return backup_type in (BackupType.Slip39_Basic, BackupType.Slip39_Advanced)
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def infer_backup_type(
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is_slip39: bool, share: Share | None = None
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) -> EnumTypeBackupType:
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if not is_slip39: # BIP-39
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return BackupType.Bip39
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elif not share or share.group_count < 1: # invalid parameters
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raise RuntimeError
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elif share.group_count == 1:
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return BackupType.Slip39_Basic
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else:
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return BackupType.Slip39_Advanced
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