From acbd662b62a2de0e7102d560f7e73d7feaf9e600 Mon Sep 17 00:00:00 2001 From: Paul Kehrer Date: Mon, 20 Nov 2017 22:25:18 +0800 Subject: restore a subset of the rand module (#708) * restore a subset of the rand module * flake * remove cleanup, go ahead and assume status will always be 1 * lighten and add power --- src/OpenSSL/rand.py | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 src/OpenSSL/rand.py (limited to 'src/OpenSSL/rand.py') diff --git a/src/OpenSSL/rand.py b/src/OpenSSL/rand.py new file mode 100644 index 0000000..d2c1767 --- /dev/null +++ b/src/OpenSSL/rand.py @@ -0,0 +1,40 @@ +""" +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() -- cgit v1.2.1