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d�e�ZiadZdd�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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aLookup 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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r�sha1cCst|||||�S)aLpkcs#5 password-based key derivation v1.5

    :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.*
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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 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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