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44 lines
1.2 KiB
Python
44 lines
1.2 KiB
Python
import functools
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import hashlib
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import secrets
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from django.contrib.auth.hashers import BasePasswordHasher
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from django.utils.crypto import constant_time_compare
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class Sha512ApiKeyHasher(BasePasswordHasher):
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"""
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An API key hasher using the sha256 algorithm.
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This hasher shouldn't be used in Django's `PASSWORD_HASHERS` setting.
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It is insecure for use in hashing passwords, but is safe for hashing
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high entropy, randomly generated API keys.
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"""
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algorithm = "sha512"
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def salt(self) -> str:
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# No need for a salt on a high entropy key.
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return ""
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def encode(self, password: str, salt: str = "") -> str:
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hashed = hashlib.sha512(password.encode()).hexdigest()
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return f"{self.algorithm}$${hashed}"
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def verify(self, password: str, encoded: str) -> bool:
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encoded_2 = self.encode(password, "")
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return constant_time_compare(encoded, encoded_2)
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@functools.cache
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def get_hasher():
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return Sha512ApiKeyHasher()
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def generate_key() -> tuple[str, str]:
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"""Generate a [key, hash] couple."""
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# this will result in key with a length of 72
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key = str(secrets.token_urlsafe(54))
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hasher = get_hasher()
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return key, hasher.encode(key)
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