55 lines
1.9 KiB
Python
55 lines
1.9 KiB
Python
# This file is part of photo21
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# Copyright (C) 2022 Amicale des élèves de l'ENS Paris-Saclay
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# SPDX-License-Identifier: GPL-3.0-or-later
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import hashlib
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import base64
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from collections import OrderedDict
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from django.utils.crypto import constant_time_compare
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from django.utils.encoding import force_bytes
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from django.utils.translation import gettext_noop as _
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from django.contrib.auth.hashers import mask_hash, BasePasswordHasher
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class SHA512PasswordHasher(BasePasswordHasher):
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"""
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The SHA512 password hashing algorithm
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It is used to migrate passwords from old Symfony2 photos server.
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https://github.com/symfony/symfony/blob/2.8/src/Symfony/Component/Security/Core/Encoder/MessageDigestPasswordEncoder.php
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"""
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algorithm = "sha512"
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def encode(self, password, iteration, salt):
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assert password is not None
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assert salt and "$" not in salt
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salted = force_bytes(password + "{" + salt + "}")
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digest = hashlib.sha512(salted).digest()
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# "stretch" hash
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for _i in range(1, int(iteration)):
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digest = hashlib.sha512(digest + salted).digest()
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digest = base64.b64encode(digest).decode()
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encoded = "%s$%s$%s$%s" % (self.algorithm, iteration, salt, digest)
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return encoded[:128]
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def verify(self, password, encoded):
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algorithm, iteration, salt, hash = encoded.split("$", 3)
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assert algorithm == self.algorithm
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encoded_2 = self.encode(password, iteration, salt)
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return constant_time_compare(encoded, encoded_2)
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def safe_summary(self, encoded):
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algorithm, iteration, salt, hash = encoded.split("$", 3)
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assert algorithm == self.algorithm
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return OrderedDict(
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[
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(_("algorithm"), algorithm),
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(_("salt"), mask_hash(salt, show=2)),
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(_("hash"), mask_hash(hash)),
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]
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)
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def harden_runtime(self, password, encoded):
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pass
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