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Passlib handlers to understand password hashes generated by Werkzeug’s `generate_password_hash`, and to generate hashes understood by `check_password_hash`.
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"""Passlib module to understand hashed password format of Werkzeug
__version__ = '0.1.0'
from base64 import b64encode
from passlib.crypto.digest import pbkdf2_hmac
from passlib.exc import InvalidHashError
from passlib.registry import register_crypt_handler_path
import passlib.utils.handlers as uh
from passlib.utils.binary import AB64_CHARS, ab64_decode, ab64_encode
from passlib.utils.compat import u
SALT_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
class werkzeug_pbkdf2_sha256(uh.HasSalt, uh.HasRounds, uh.GenericHandler):
# pylint: disable=invalid-name
"""Passlib handler for Werkzeug’s PBKDF2:SHA-256 passwords
checksum_chars = '0123456789abcdef'
checksum_size = 64
default_rounds = 150000
default_salt_chars = SALT_CHARS
default_salt_size = 8
_digest = 'sha256'
ident = u('pbkdf2:sha256')
min_salt_size = 1
name = 'werkzeug_pbkdf2_sha256'
salt_chars = SALT_CHARS
# pylint: disable=arguments-differ
def from_string(cls, password_hash, **context):
"""Create a new hash object from a string
full_method, salt, checksum = password_hash.split('$')
except ValueError as exc:
raise InvalidHashError(cls) from exc
method, digest, rounds = full_method.split(':')
if ':'.join((method, digest)) != cls.ident:
raise InvalidHashError(cls)
if checksum:
return cls(salt=salt, checksum=checksum, rounds=int(rounds))
def to_string(self):
full_method = ':'.join((self.ident, str(self.rounds)))
return '$'.join((full_method, self.salt, self.checksum))
def _calc_checksum(self, secret):
checksum = pbkdf2_hmac(self._digest, secret, self.salt, self.rounds)
return checksum.hex()
register_crypt_handler_path('werkzeug_pbkdf2_sha256', 'passlib_werkzeug')