diff options
Diffstat (limited to 'frozen_deps/Crypto/Random/OSRNG/rng_base.py')
-rw-r--r-- | frozen_deps/Crypto/Random/OSRNG/rng_base.py | 88 |
1 files changed, 0 insertions, 88 deletions
diff --git a/frozen_deps/Crypto/Random/OSRNG/rng_base.py b/frozen_deps/Crypto/Random/OSRNG/rng_base.py deleted file mode 100644 index 546f2e9..0000000 --- a/frozen_deps/Crypto/Random/OSRNG/rng_base.py +++ /dev/null @@ -1,88 +0,0 @@ -# -# Random/OSRNG/rng_base.py : Base class for OSRNG -# -# Written in 2008 by Dwayne C. Litzenberger <dlitz@dlitz.net> -# -# =================================================================== -# The contents of this file are dedicated to the public domain. To -# the extent that dedication to the public domain is not available, -# everyone is granted a worldwide, perpetual, royalty-free, -# non-exclusive license to exercise all rights associated with the -# contents of this file for any purpose whatsoever. -# No rights are reserved. -# -# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, -# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF -# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND -# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS -# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN -# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN -# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE -# SOFTWARE. -# =================================================================== - -__revision__ = "$Id$" - -import sys -if sys.version_info[0] == 2 and sys.version_info[1] == 1: - from Crypto.Util.py21compat import * - -class BaseRNG(object): - - def __init__(self): - self.closed = False - self._selftest() - - def __del__(self): - self.close() - - def _selftest(self): - # Test that urandom can return data - data = self.read(16) - if len(data) != 16: - raise AssertionError("read truncated") - - # Test that we get different data every time (if we don't, the RNG is - # probably malfunctioning) - data2 = self.read(16) - if data == data2: - raise AssertionError("OS RNG returned duplicate data") - - # PEP 343: Support for the "with" statement - def __enter__(self): - pass - def __exit__(self): - """PEP 343 support""" - self.close() - - def close(self): - if not self.closed: - self._close() - self.closed = True - - def flush(self): - pass - - def read(self, N=-1): - """Return N bytes from the RNG.""" - if self.closed: - raise ValueError("I/O operation on closed file") - if not isinstance(N, int): - raise TypeError("an integer is required") - if N < 0: - raise ValueError("cannot read to end of infinite stream") - elif N == 0: - return "" - data = self._read(N) - if len(data) != N: - raise AssertionError("%s produced truncated output (requested %d, got %d)" % (self.name, N, len(data))) - return data - - def _close(self): - raise NotImplementedError("child class must implement this") - - def _read(self, N): - raise NotImplementedError("child class must implement this") - - -# vim:set ts=4 sw=4 sts=4 expandtab: |