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phppass located - http://www.openwall.com/phpass/
algorithm described - http://www.openwall.com/articles/PHP-Users-Passwords
phpass context - blowfish, bsdi_crypt, phpass
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The :meth:`~passlib.ifc.PasswordHash.using` method accepts the following optional keywords:
:type salt: str
:param salt:
Optional salt string.
If not specified, one will be autogenerated (this is recommended).
If specified, it must be 8 characters, drawn from the regexp range ``[./0-9A-Za-z]``.
:type rounds: int
:param rounds:
Optional number of rounds to use.
Defaults to 19, must be between 7 and 30, inclusive.
This value is logarithmic, the actual number of iterations used will be :samp:`2**{rounds}`.
:type ident: str
:param ident:
phpBB3 uses ``H`` instead of ``P`` for its identifier,
this may be set to ``H`` in order to generate phpBB3 compatible hashes.
it defaults to ``P``.
: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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