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:param data:
:type data: bytes
:param int digest_size: the requested digest size; must be
at most :py:attr:`.MAX_DIGEST_SIZE`;
the default digest size is :py:data:`.BYTES`
:param key: the key to be set for keyed MAC/PRF usage; if set,
the key must be at most :py:data:`.KEYBYTES_MAX` long
:type key: bytes
:param salt: a initialization salt at most
:py:attr:`.SALT_SIZE` long; it will be zero-padded
if needed
:type salt: bytes
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in cpython version 3.6
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