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sha1_crypta& This class implements the SHA1-Crypt password hash, and follows the :ref:`password-hash-api`.
It supports a variable-length salt, and a variable number of rounds.
The :meth:`~passlib.ifc.PasswordHash.using` method accepts the following optional keywords:
:type salt: str
:param salt:
Optional salt string.
If not specified, an 8 character one will be autogenerated (this is recommended).
If specified, it must be 0-64 characters, drawn from the regexp range ``[./0-9A-Za-z]``.
:type salt_size: int
:param salt_size:
Optional number of bytes to use when autogenerating new salts.
Defaults to 8 bytes, but can be any value between 0 and 64.
:type rounds: int
:param rounds:
Optional number of rounds to use.
Defaults to 480000, must be between 1 and 4294967295, inclusive.
:type relaxed: bool
:param relaxed:
By default, providing an invalid value for one of the other
keywords will result in a :exc:`ValueError`. If ``relaxed=True``,
and the error can be corrected, a :exc:`~passlib.exc.PasslibHashWarning`
will be issued instead. Correctable errors include ``rounds``
that are too small or too large, and ``salt`` strings that are too long.
.. versionadded:: 1.6
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