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Derive a cryptographic key using the ``passwd`` and ``salt``
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:param bytes salt:
:param bytes salt: *must* be *exactly* :py:const:`.SALTBYTES` long
:param int dklen:
:param int opslimit:
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Derive a cryptographic key using the ``passwd`` and ``salt``
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:return: serialized key hash, including salt and tuning parameters
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:type passwd: bytes
:param opslimit: computational cost
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:param memlimit: memory cost
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:param alg: algorithm identifier
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