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Derive a ``size`` bytes long key from a caller-supplied
``password`` and ``salt`` pair using the scryptsalsa208sha256
memory-hard construct.


the enclosing module provides the constants

    - :py:const:`.OPSLIMIT_INTERACTIVE`
    - :py:const:`.MEMLIMIT_INTERACTIVE`
    - :py:const:`.OPSLIMIT_SENSITIVE`
    - :py:const:`.MEMLIMIT_SENSITIVE`
    - :py:const:`.OPSLIMIT_MODERATE`
    - :py:const:`.MEMLIMIT_MODERATE`

as a guidance for correct settings respectively for the
interactive login and the long term key protecting sensitive data
use cases.

:param size: derived key size, must be between
             :py:const:`.BYTES_MIN` and
             :py:const:`.BYTES_MAX`
:type size: int
:param password: password used to seed the key derivation procedure;
                 it length must be between
                 :py:const:`.PASSWD_MIN` and
                 :py:const:`.PASSWD_MAX`
:type password: bytes
:param salt: **RANDOM** salt used in the key derivation procedure;
             its length must be exactly :py:const:`.SALTBYTES`
:type salt: bytes
:param opslimit: the time component (operation count)
                 of the key derivation procedure's computational cost;
                 it must be between
                 :py:const:`.OPSLIMIT_MIN` and
                 :py:const:`.OPSLIMIT_MAX`
:type opslimit: int
:param memlimit: the memory occupation component
                 of the key derivation procedure's computational cost;
                 it must be between
                 :py:const:`.MEMLIMIT_MIN` and
                 :py:const:`.MEMLIMIT_MAX`
:type memlimit: int
:rtype: bytes
:raises nacl.exceptions.UnavailableError: If called when using a
    minimal build of libsodium.

.. versionadded:: 1.2
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Hashes a password with a random salt, using the memory-hard
scryptsalsa208sha256 construct and returning an ascii string
that has all the needed info to check against a future password

The default settings for opslimit and memlimit are those deemed
correct for the interactive user login case.

:param bytes password:
:param int opslimit:
:param int memlimit:
:rtype: bytes
:raises nacl.exceptions.UnavailableError: If called when using a
    minimal build of libsodium.

.. versionadded:: 1.2
rr)rrrr rr$<00>&crypto_pwhash_scryptsalsa208sha256_str)r	rrs&&&r<00>strr/<00>s9<00><00>,<0B><11>(<28><13>$<24>$<24><06><10>=<3D>=<3D>?<3F>?<3F><10>H<EFBFBD><06>rc

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Takes the output of scryptsalsa208sha256 and compares it against
a user provided password to see if they are the same

:param password_hash: bytes
:param password: bytes
:rtype: boolean
:raises nacl.exceptions.UnavailableError: If called when using a
    minimal build of libsodium.

.. versionadded:: 1.2
rrz/The password hash must be exactly %s bytes long)rrrr r!<00>PWHASH_SIZErr$<00>+crypto_pwhash_scryptsalsa208sha256_STRBYTESr#<00>-crypto_pwhash_scryptsalsa208sha256_str_verify)r1r	s&&r<00>verifyr7<00>sk<00><00><0B><11>(<28><13>$<24>$<24><06><0B><0B>M<EFBFBD><1A>k<EFBFBD>)<29>9<>
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