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Derive a cryptographic key using the ``passwd`` and ``salt``
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:param bytes passwd:
:param bytes salt:
:param bytes salt: *must* be *exactly* :py:const:`.SALTBYTES` long
:param int dklen:
:param int opslimit:
:param int n:
:param int r: block size,
:param int p: the parallelism factor
:param int maxmem: the maximum available memory available for scrypt's
operations
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Derive a cryptographic key using the ``passwd`` and ``salt``
given as input, returning a string representation which includes
the salt and the tuning parameters.
The returned string can be directly stored as a password hash.
See :py:func:`.crypto_pwhash_scryptsalsa208sha256` for a short
discussion about ``opslimit`` and ``memlimit`` values.
:param bytes passwd:
:param int opslimit:
:param int memlimit:
:return: serialized key hash, including salt and tuning parameters
:rtype: bytes
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Verifies the ``passwd`` against the ``passwd_hash`` that was generated.
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:param passwd_hash: bytes
:param passwd: bytes
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Derive a raw cryptographic key using the ``passwd`` and the ``salt``
given as input to the ``alg`` algorithm.
:param outlen: the length of the derived key
:type outlen: int
:param passwd: The input password
:type passwd: bytes
:param opslimit: computational cost
:type opslimit: int
:param memlimit: memory cost
:type memlimit: int
:param alg: algorithm identifier
:type alg: int
:return: derived key
:rtype: bytes
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Derive a cryptographic key using the ``passwd`` given as input
and a random ``salt``, returning a string representation which
includes the salt, the tuning parameters and the used algorithm.
:param passwd: The input password
:type passwd: bytes
:param opslimit: computational cost
:type opslimit: int
:param memlimit: memory cost
:type memlimit: int
:param alg: The algorithm to use
:type alg: int
:return: serialized derived key and parameters
:rtype: bytes
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Verifies the ``passwd`` against a given password hash.
Returns True on success, raises InvalidkeyError on failure
:param passwd_hash: saved password hash
:type passwd_hash: bytes
:param passwd: password to be checked
:type passwd: bytes
:return: success
:rtype: boolean
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