1""" 2PRNG management routines, thin wrappers. 3""" 4 5from OpenSSL._util import lib as _lib 6 7 8def add(buffer, entropy): 9 """ 10 Mix bytes from *string* into the PRNG state. 11 12 The *entropy* argument is (the lower bound of) an estimate of how much 13 randomness is contained in *string*, measured in bytes. 14 15 For more information, see e.g. :rfc:`1750`. 16 17 This function is only relevant if you are forking Python processes and 18 need to reseed the CSPRNG after fork. 19 20 :param buffer: Buffer with random data. 21 :param entropy: The entropy (in bytes) measurement of the buffer. 22 23 :return: :obj:`None` 24 """ 25 if not isinstance(buffer, bytes): 26 raise TypeError("buffer must be a byte string") 27 28 if not isinstance(entropy, int): 29 raise TypeError("entropy must be an integer") 30 31 _lib.RAND_add(buffer, len(buffer), entropy) 32 33 34def status(): 35 """ 36 Check whether the PRNG has been seeded with enough data. 37 38 :return: 1 if the PRNG is seeded enough, 0 otherwise. 39 """ 40 return _lib.RAND_status() 41