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"""MD5-based algorithm used by Postgres for pg_shadow table"""
from hashlib import md5
import passlib.utils.handlers as uh
from passlib.utils import to_bytes
__all__ = [
"postgres_md5",
]
class postgres_md5(uh.HasUserContext, uh.StaticHandler):
"""This class implements the Postgres MD5 Password hash, and follows the :ref:`password-hash-api`.
It does a single round of hashing, and relies on the username as the salt.
The :meth:`~passlib.ifc.PasswordHash.hash`, :meth:`~passlib.ifc.PasswordHash.genhash`, and :meth:`~passlib.ifc.PasswordHash.verify` methods all require the
following additional contextual keywords:
:type user: str
:param user: name of postgres user account this password is associated with.
"""
name = "postgres_md5"
_hash_prefix = "md5"
checksum_chars = uh.HEX_CHARS
checksum_size = 32
def _calc_checksum(self, secret):
if isinstance(secret, str):
secret = secret.encode("utf-8")
user = to_bytes(self.user, "utf-8", param="user")
return md5(secret + user).hexdigest()
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