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rand.py

"""
PRNG management routines, thin wrappers.
"""

from OpenSSL._util import lib as _lib

def add(buffer, entropy):
    """
    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`
    """
    if not isinstance(buffer, bytes):
        raise TypeError("buffer must be a byte string")

if not isinstance(entropy, int):
        raise TypeError("entropy must be an integer")

_lib.RAND_add(buffer, len(buffer), entropy)

def status():
    """
    Check whether the PRNG has been seeded with enough data.

:return: 1 if the PRNG is seeded enough, 0 otherwise.
    """
    return _lib.RAND_status()

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