40 lines
976 B
Python
40 lines
976 B
Python
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# sid_hashers.py
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from abc import ABC, abstractmethod
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import hashlib
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# ---------------------------------------------------------------------
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# Structural hash strategy interface
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# ---------------------------------------------------------------------
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class StructureHashStrategy(ABC):
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"""
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Abstract interface for derivation / structural hashers.
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"""
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@abstractmethod
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def hash_struct(self, payload: bytes) -> str:
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"""
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Hash a byte payload deterministically and return hex digest.
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"""
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pass
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# ---------------------------------------------------------------------
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# SHA-256 default implementation
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# ---------------------------------------------------------------------
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class SHA256SIDHash(StructureHashStrategy):
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"""
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Default SHA-256 SID hasher.
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"""
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name = "sha256.sid.v1"
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def hash_struct(self, payload: bytes) -> str:
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h = hashlib.sha256()
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h.update(payload)
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return h.hexdigest()
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