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* deal with lack of PY3-compatibile c-ext implementation
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internal helper which tries to distinguish pybcrypt vs bcrypt.
:returns:
True if cext-based py-bcrypt,
False if ffi-based bcrypt,
None if 'bcrypt' module not found.
.. versionchanged:: 1.6.3
Now assuming bcrypt installed, unless py-bcrypt explicitly detected.
Previous releases assumed py-bcrypt by default.
Making this change since py-bcrypt is (apparently) unmaintained and static,
whereas bcrypt is being actively maintained, and it's internal structure may shift.
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Base class which implements brunt of BCrypt code.
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to override w/ backend-specific methods.
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are modified to prepend the correct backend-specific subclass.
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helper called by from backend mixin classes' _load_backend_mixin() --
invoked after backend imports have been loaded, and performs
feature detection & testing common to all backends.
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helper to check for cryptblowfish 8bit bug (fixed in 2y/2b);
even though it's not known to be present in any of passlib's backends.
this is treated as FATAL, because it can easily result in seriously malformed hashes,
and we can't correct for it ourselves.
test cases from <http://cvsweb.openwall.com/cgi/cvsweb.cgi/Owl/packages/glibc/crypt_blowfish/wrapper.c.diff?r1=1.9;r2=1.10>
reference hash is the incorrectly generated $2x$ hash taken from above url
s ёrF s8 05$6bNw2HLQYeqHYyBfLMsv/OiwqTymGIGzFsA4hOTWebfehXHNprcASs8 05$6bNw2HLQYeqHYyBfLMsv/OUcZd0LKP39b87nBw3.S2tVZSqiQX6euz�passlib.hash.bcrypt: Your installation of the %r backend is vulnerable to the crypt_blowfish 8-bit bug (CVE-2011-2483) under %r hashes, and should be upgraded or replaced with another backendz(%s backend failed to verify %s 8bit hashN)�encoder
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check for bsd wraparound bug (fixed in 2b)
this is treated as a warning, because it's rare in the field,
and pybcrypt (as of 2015-7-21) is unpatched, but some people may be stuck with it.
test cases from <http://www.openwall.com/lists/oss-security/2012/01/02/4>
NOTE: reference hash is of password "0"*72
NOTE: if in future we need to deliberately create hashes which have this bug,
can use something like 'hashpw(repeat_string(secret[:((1+secret) % 256) or 1]), 72)'
s 01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789N� rF s8 04$R1lJ2gkNaoPGdafE.H.16.nVyh2niHsGJhayOHLMiXlI45o8/DU.6Ts8 04$R1lJ2gkNaoPGdafE.H.16.1MKHPvmKwryeulRe225LKProWYwt9Oiz.%s backend failed to verify %s wraparound hashF)rh ri rj rk r" r# �detect_wrap_bugl s
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This class implements the BCrypt password hash, and follows the :ref:`password-hash-api`.
It supports a fixed-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, one will be autogenerated (this is recommended).
If specified, it must be 22 characters, drawn from the regexp range ``[./0-9A-Za-z]``.
:type rounds: int
:param rounds:
Optional number of rounds to use.
Defaults to 12, must be between 4 and 31, inclusive.
This value is logarithmic, the actual number of iterations used will be :samp:`2**{rounds}`
-- increasing the rounds by +1 will double the amount of time taken.
:type ident: str
:param ident:
Specifies which version of the BCrypt algorithm will be used when creating a new hash.
Typically this option is not needed, as the default (``"2b"``) is usually the correct choice.
If specified, it must be one of the following:
* ``"2"`` - the first revision of BCrypt, which suffers from a minor security flaw and is generally not used anymore.
* ``"2a"`` - some implementations suffered from rare security flaws, replaced by 2b.
* ``"2y"`` - format specific to the *crypt_blowfish* BCrypt implementation,
identical to ``"2b"`` in all but name.
* ``"2b"`` - latest revision of the official BCrypt algorithm, current default.
:param bool truncate_error:
By default, BCrypt will silently truncate passwords larger than 72 bytes.
Setting ``truncate_error=True`` will cause :meth:`~passlib.ifc.PasswordHash.hash`
to raise a :exc:`~passlib.exc.PasswordTruncateError` instead.
.. versionadded:: 1.7
: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
.. versionchanged:: 1.6
This class now supports ``"2y"`` hashes, and recognizes
(but does not support) the broken ``"2x"`` hashes.
(see the :ref:`crypt_blowfish bug <crypt-blowfish-bug>`
for details).
.. versionchanged:: 1.6
Added a pure-python backend.
.. versionchanged:: 1.6.3
Added support for ``"2b"`` variant.
.. versionchanged:: 1.7
Now defaults to ``"2b"`` variant.
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abstracts out some bits bcrypt_sha256 & django_bcrypt_sha256 share.
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- disable truncation support, sha256 wrappers don't need it.
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This class implements a composition of BCrypt + HMAC_SHA256,
and follows the :ref:`password-hash-api`.
It supports a fixed-length salt, and a variable number of rounds.
The :meth:`~passlib.ifc.PasswordHash.hash` and :meth:`~passlib.ifc.PasswordHash.genconfig` methods accept
all the same optional keywords as the base :class:`bcrypt` hash.
.. versionadded:: 1.6.2
.. versionchanged:: 1.7
Now defaults to ``"2b"`` bcrypt variant; though supports older hashes
generated using the ``"2a"`` bcrypt variant.
.. versionchanged:: 1.7.3
For increased security, updated to use HMAC-SHA256 instead of plain SHA256.
Now only supports the ``"2b"`` bcrypt variant. Hash format updated to "v=2".
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