41 lines
1 KiB
Python
41 lines
1 KiB
Python
|
"""
|
||
|
|
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()
|