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PRNG management routines, thin wrappers.
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Mix bytes from *string* into the PRNG state.
The *entropy* argument is (the lower bound of) an estimate of how much
randomness is contained in *string*, measured in bytes.
For more information, see e.g. :rfc:`1750`.
This function is only relevant if you are forking Python processes and
need to reseed the CSPRNG after fork.
:param buffer: Buffer with random data.
:param entropy: The entropy (in bytes) measurement of the buffer.
:return: :obj:`None`
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Check whether the PRNG has been seeded with enough data.
:return: 1 if the PRNG is seeded enough, 0 otherwise.
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