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    helper class used to run scrypt kdf, see scrypt() for frontend

    .. warning::
        this class does NO validation of the input ranges or types.

        it's not intended to be used directly,
        but only as a backend for :func:`passlib.utils.scrypt.scrypt()`.
    icCs||||�j|||�S(s-create engine & run scrypt() hash calculation(trun(tclstsecrettsalttntrtptkeylen((sB/usr/lib/python2.7/site-packages/passlib/crypto/scrypt/_builtin.pytexecute2scs�||_||_||_|d>|_|j||_|d>|_}|d>|_tjdt	|�d�|_
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        run scrypt kdf for specified secret, salt, and keylen

        .. note::

            * time cost is ``O(n * r * p)``
            * mem cost is ``O(n * r)``
        tsha256troundsiRtc3s&|]}��||�!�VqdS(N((t.0toffset(tinputtsmixR(sB/usr/lib/python2.7/site-packages/passlib/crypto/scrypt/_builtin.pys	<genexpr>ssi(RRR'R
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��|d7}qyW|j	��S(ssrun SCrypt smix function on a single input block

        :arg input:
            byte string containing input data.
            interpreted as 32*r little endian 4 byte integers.

        :returns:
            byte string containing output data
            derived by mixing input using n & r parameters.

        .. note:: time & mem cost are both ``O(n * r)``
        c3sEd}x8|�kr@t��}|V�|��|d7}q	WdS(Nii(ttuple(titlast(RtbufferR(sB/usr/lib/python2.7/site-packages/passlib/crypto/scrypt/_builtin.pytvgen�s
iicss|]\}}||AVqdS(N((R$tatb((sB/usr/lib/python2.7/site-packages/passlib/crypto/scrypt/_builtin.pys	<genexpr>�s(
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cCs�|j}|d}t|�}d}x|||kr�|d}td�t||�D��|||+}td�t||�D��|||||+}|}q(WdS(s�
        block mixing function used by smix()
        uses salsa20/8 core to mix block contents.

        :arg source:
            source to read from.
            should be list of 32*r 4-byte integers
            (2*r salsa20 blocks).

        :arg target:
            target to write to.
            should be list with same size as source.
            the existing value of this buffer is ignored.

        .. warning::

            this operates *in place* on target,
            so source & target should NOT be same list.

        .. note::

            * time cost is ``O(r)`` -- loops 16*r times, salsa20() has ``O(1)`` cost.

            * memory cost is ``O(1)`` -- salsa20() uses 16 x uint4,
              all other operations done in-place.
        i�iicss|]\}}||AVqdS(N((R$R0R1((sB/usr/lib/python2.7/site-packages/passlib/crypto/scrypt/_builtin.pys	<genexpr>�scss|]\}}||AVqdS(N((R$R0R1((sB/usr/lib/python2.7/site-packages/passlib/crypto/scrypt/_builtin.pys	<genexpr>�sN(RtiterRR(RtsourcettargetthalfttmptsiterR9tjn((sB/usr/lib/python2.7/site-packages/passlib/crypto/scrypt/_builtin.pyR�s	

*2cCs^|d}td�t|t|��D��|d*}td�t||�D��|d)dS(s0special bmix() method optimized for ``r=1`` caseicss|]\}}||AVqdS(N((R$R0R1((sB/usr/lib/python2.7/site-packages/passlib/crypto/scrypt/_builtin.pys	<genexpr>�scss|]\}}||AVqdS(N((R$R0R1((sB/usr/lib/python2.7/site-packages/passlib/crypto/scrypt/_builtin.pys	<genexpr>�sN(RRR;(RR<R=tBR?((sB/usr/lib/python2.7/site-packages/passlib/crypto/scrypt/_builtin.pyR�s
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RRRRtNoneRRtclassmethodRR RR'RR(((sB/usr/lib/python2.7/site-packages/passlib/crypto/scrypt/_builtin.pyRs 		"	!	C	((RERRtpasslib.utils.compatRtpasslib.crypto.digestRtpasslib.crypto.scrypt._salsaRt__all__tobjectR(((sB/usr/lib/python2.7/site-packages/passlib/crypto/scrypt/_builtin.pyt<module>s