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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()`.
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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)``
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: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)``
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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.
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