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passlib.handlers.cisco -- Cisco password hashes
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This class implements the password hash used by older Cisco PIX firewalls,
and follows the :ref:`password-hash-api`.
It does a single round of hashing, and relies on the username
as the salt.
This class only allows passwords <= 16 bytes, anything larger
will result in a :exc:`~passlib.exc.PasswordSizeError` if passed to :meth:`~cisco_pix.hash`,
and be silently rejected if passed to :meth:`~cisco_pix.verify`.
The :meth:`~passlib.ifc.PasswordHash.hash`,
:meth:`~passlib.ifc.PasswordHash.genhash`, and
:meth:`~passlib.ifc.PasswordHash.verify` methods
all support the following extra keyword:
:param str user:
String containing name of user account this password is associated with.
This is *required* in order to correctly hash passwords associated
with a user account on the Cisco device, as it is used to salt
the hash.
Conversely, this *must* be omitted or set to ``""`` in order to correctly
hash passwords which don't have an associated user account
(such as the "enable" password).
.. versionadded:: 1.6
.. versionchanged:: 1.7.1
Passwords > 16 bytes are now rejected / throw error instead of being silently truncated,
to match Cisco behavior. A number of :ref:`bugs <passlib-asa96-bug>` were fixed
which caused prior releases to generate unverifiable hashes in certain cases.
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This function implements the "encrypted" hash format used by Cisco
PIX & ASA. It's behavior has been confirmed for ASA 9.6,
but is presumed correct for PIX & other ASA releases,
as it fits with known test vectors, and existing literature.
While nearly the same, the PIX & ASA hashes have slight differences,
so this function performs differently based on the _is_asa class flag.
Noteable changes from PIX to ASA include password size limit
increased from 16 -> 32, and other internal changes.
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This class implements the password hash used by Cisco ASA/PIX 7.0 and newer (2005).
Aside from a different internal algorithm, it's use and format is identical
to the older :class:`cisco_pix` class.
For passwords less than 13 characters, this should be identical to :class:`!cisco_pix`,
but will generate a different hash for most larger inputs
(See the `Format & Algorithm`_ section for the details).
This class only allows passwords <= 32 bytes, anything larger
will result in a :exc:`~passlib.exc.PasswordSizeError` if passed to :meth:`~cisco_asa.hash`,
and be silently rejected if passed to :meth:`~cisco_asa.verify`.
.. versionadded:: 1.7
.. versionchanged:: 1.7.1
Passwords > 32 bytes are now rejected / throw error instead of being silently truncated,
to match Cisco behavior. A number of :ref:`bugs <passlib-asa96-bug>` were fixed
which caused prior releases to generate unverifiable hashes in certain cases.
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This class implements the "Type 7" password encoding used by Cisco IOS,
and follows the :ref:`password-hash-api`.
It has a simple 4-5 bit salt, but is nonetheless a reversible encoding
instead of a real hash.
The :meth:`~passlib.ifc.PasswordHash.using` method accepts the following optional keywords:
:type salt: int
:param salt:
This may be an optional salt integer drawn from ``range(0,16)``.
If omitted, one will be chosen at random.
: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
``salt`` values that are out of range.
Note that while this class outputs digests in upper-case hexadecimal,
it will accept lower-case as well.
This class also provides the following additional method:
.. automethod:: decode
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validate & normalize salt value.
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the salt for this algorithm is an integer 0-52, not a string
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:arg hash: encoded password
:param encoding: optional encoding to use (defaults to ``UTF-8``).
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