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40 lines
1.0 KiB
40 lines
1.0 KiB
"""
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PRNG management routines, thin wrappers.
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"""
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from OpenSSL._util import lib as _lib
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def add(buffer, entropy):
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"""
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Mix bytes from *string* into the PRNG state.
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The *entropy* argument is (the lower bound of) an estimate of how much
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randomness is contained in *string*, measured in bytes.
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For more information, see e.g. :rfc:`1750`.
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This function is only relevant if you are forking Python processes and
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need to reseed the CSPRNG after fork.
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:param buffer: Buffer with random data.
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:param entropy: The entropy (in bytes) measurement of the buffer.
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:return: :obj:`None`
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"""
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if not isinstance(buffer, bytes):
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raise TypeError("buffer must be a byte string")
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if not isinstance(entropy, int):
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raise TypeError("entropy must be an integer")
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_lib.RAND_add(buffer, len(buffer), entropy)
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def status():
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"""
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Check whether the PRNG has been seeded with enough data.
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:return: 1 if the PRNG is seeded enough, 0 otherwise.
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"""
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return _lib.RAND_status()
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