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d�e�Zi adZdd� Zddd�Zddd�ZdS )z�passlib.pbkdf2 - PBKDF2 support
this module is getting increasingly poorly named.
maybe rename to "kdf" since it's getting more key derivation functions added.
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deprecatedZremovedZ func_moduleZ replacement)Zhmac_zhmac-c s� | t v rt | S t| t�r^| �t�s2td| f ��t| dd� �j� � fdd�}||jj f}n,t
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a Lookup pseudo-random family (PRF) by name.
:arg name:
This must be the name of a recognized prf.
Currently this only recognizes names with the format
:samp:`hmac-{digest}`, where :samp:`{digest}`
is the name of a hash function such as
``md5``, ``sha256``, etc.
todo: restore text about callables.
:raises ValueError: if the name is not known
:raises TypeError: if the name is not a callable or string
:returns:
a tuple of :samp:`({prf_func}, {digest_size})`, where:
* :samp:`{prf_func}` is a function implementing
the specified PRF, and has the signature
``prf_func(secret, message) -> digest``.
* :samp:`{digest_size}` is an integer indicating
the number of bytes the function returns.
Usage example::
>>> from passlib.utils.pbkdf2 import get_prf
>>> hmac_sha256, dsize = get_prf("hmac-sha256")
>>> hmac_sha256
<function hmac_sha256 at 0x1e37c80>
>>> dsize
32
>>> digest = hmac_sha256('password', 'message')
.. deprecated:: 1.7
This function is deprecated, and will be removed in Passlib 2.0.
This only related replacement is :func:`passlib.crypto.digest.compile_hmac`.
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:arg secret: passphrase to use to generate key
:arg salt: salt string to use when generating key
:param rounds: number of rounds to use to generate key
:arg keylen: number of bytes to generate (if ``None``, uses digest's native size)
:param hash:
hash function to use. must be name of a hash recognized by hashlib.
:returns:
raw bytes of generated key
.. note::
This algorithm has been deprecated, new code should use PBKDF2.
Among other limitations, ``keylen`` cannot be larger
than the digest size of the specified hash.
.. deprecated:: 1.7
This has been relocated to :func:`passlib.crypto.digest.pbkdf1`,
and this version will be removed in Passlib 2.0.
*Note the call signature has changed.*
)�_pbkdf1)�secret�salt�rounds�keylen�hashr r r r w s r � hmac-sha1c C s@ t |�s t|t�r$|�t�s$td��|dd� }t|| |||�S )aW pkcs#5 password-based key derivation v2.0
:arg secret:
passphrase to use to generate key
:arg salt:
salt string to use when generating key
:param rounds:
number of rounds to use to generate key
:arg keylen:
number of bytes to generate.
if set to ``None``, will use digest size of selected prf.
:param prf:
psuedo-random family to use for key strengthening.
this must be a string starting with ``"hmac-"``, followed by the name of a known digest.
this defaults to ``"hmac-sha1"`` (the only prf explicitly listed in
the PBKDF2 specification)
.. rst-class:: warning
.. versionchanged 1.7:
This argument no longer supports arbitrary PRF callables --
These were rarely / never used, and created too many unwanted codepaths.
:returns:
raw bytes of generated key
.. deprecated:: 1.7
This has been deprecated in favor of :func:`passlib.crypto.digest.pbkdf2_hmac`,
and will be removed in Passlib 2.0. *Note the call signature has changed.*
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