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=============================================
:mod:`passlib` - Crypt Algorithms
=============================================
.. currentmodule:: passlib
All of the crypt algorithms must inherit from :class:`CryptHandler`,
which defines a common interface all algorithms must support.
You may use the algorithms directly, by creating
an instance and calling it as described in :doc:`Implementing a Crypt Algorithm <implementation>`.
However, you will normally will not need to deal with the internals of the algorithms
directly, but rather take advantage of one of the predefined algorithms,
through the :doc:`frontend functions <quickstart>` or a
custom :doc:`crypt context <contexts>`.
Standard Algorithms
===================
The following algorithms are all standard password hashing algorithms
used by various Posix operating systems over the years.
.. note::
BPS tries to use external accelaration for these classes when possible,
but provides a pure-python fallback so that these algorithms will
ALWAYS be available for use.
.. autoclass:: UnixCrypt
.. autoclass:: Md5Crypt
.. autoclass:: Sha256Crypt
.. autoclass:: Sha512Crypt
.. autoclass:: BCrypt
Database Algorithms
===================
BPS also provides implementations of the hash
algorithms used by MySql and PostgreSQL.
.. autoclass:: Mysql10Crypt
.. autoclass:: Mysql41Crypt
.. autoclass:: PostgresMd5Crypt
.. data:: mysql_context
This context object contains the algorithms used by MySql 4.1 and newer
for storing user passwords.
.. data:: postgres_context
This context object should be able to read/write/verify
the values found in the password field of the pg_shadow table in Postgres.
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