basic functionalty

modules/Crypto/Util/randpool.py

@@ -0,0 +1,82 @@
+#
+#  randpool.py : Cryptographically strong random number generation
+#
+# Part of the Python Cryptography Toolkit
+#
+# Written by Andrew M. Kuchling, Mark Moraes, and others
+#
+# ===================================================================
+# 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__ = "$Id$"
+
+from Crypto.pct_warnings import RandomPool_DeprecationWarning
+import Crypto.Random
+import warnings
+
+class RandomPool:
+    """Deprecated.  Use Random.new() instead.
+
+    See http://www.pycrypto.org/randpool-broken
+    """
+    def __init__(self, numbytes = 160, cipher=None, hash=None, file=None):
+        warnings.warn("This application uses RandomPool, which is BROKEN in older releases.  See http://www.pycrypto.org/randpool-broken",
+            RandomPool_DeprecationWarning)
+        self.__rng = Crypto.Random.new()
+        self.bytes = numbytes
+        self.bits = self.bytes * 8
+        self.entropy = self.bits
+
+    def get_bytes(self, N):
+        return self.__rng.read(N)
+
+    def _updateEntropyEstimate(self, nbits):
+        self.entropy += nbits
+        if self.entropy < 0:
+            self.entropy = 0
+        elif self.entropy > self.bits:
+            self.entropy = self.bits
+
+    def _randomize(self, N=0, devname="/dev/urandom"):
+        """Dummy _randomize() function"""
+        self.__rng.flush()
+
+    def randomize(self, N=0):
+        """Dummy randomize() function"""
+        self.__rng.flush()
+
+    def stir(self, s=''):
+        """Dummy stir() function"""
+        self.__rng.flush()
+
+    def stir_n(self, N=3):
+        """Dummy stir_n() function"""
+        self.__rng.flush()
+
+    def add_event(self, s=''):
+        """Dummy add_event() function"""
+        self.__rng.flush()
+
+    def getBytes(self, N):
+        """Dummy getBytes() function"""
+        return self.get_bytes(N)
+
+    def addEvent(self, event, s=""):
+        """Dummy addEvent() function"""
+        return self.add_event()