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Derive a ``size`` bytes long key from a caller-supplied
``password`` and ``salt`` pair using the argon2i
memory-hard construct.
the enclosing module provides the constants
- :py:const:`.OPSLIMIT_INTERACTIVE`
- :py:const:`.MEMLIMIT_INTERACTIVE`
- :py:const:`.OPSLIMIT_MODERATE`
- :py:const:`.MEMLIMIT_MODERATE`
- :py:const:`.OPSLIMIT_SENSITIVE`
- :py:const:`.MEMLIMIT_SENSITIVE`
as a guidance for correct settings.
: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
.. versionadded:: 1.2
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Hashes a password with a random salt, using the memory-hard
argon2i 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
.. versionadded:: 1.2
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