Include module for desktop build

2012-09-09 17:29:09 +02:00
parent 89426d75ab
commit 36f653f65b
88 changed files with 9967 additions and 1 deletions
@@ -0,0 +1,85 @@
+# Copyright (c) 2002-2012 Zooko Wilcox-O'Hearn
+#  This file is part of pyutil; see README.rst for licensing terms.
+
+import warnings
+import os, random
+
+try:
+    import hashexpand
+    class SHA256Random(hashexpand.SHA256Expander, random.Random):
+        def __init__(self, seed=None, deterministic=True):
+            warnings.warn("deprecated", DeprecationWarning)
+            if not deterministic:
+                raise NotImplementedError, "SHA256Expander is always deterministic.  For non-deterministic, try urandomRandom."
+
+            hashexpand.SHA256Expander.__init__(self)
+            random.Random.__init__(self, seed)
+            self.seed(seed)
+
+        def seed(self, seed=None):
+            if seed is None:
+                import increasing_timer
+                seed = repr(increasing_timer.time())
+            hashexpand.SHA256Expander.seed(self, seed)
+
+
+    class SHA256Random(hashexpand.SHA256Expander, random.Random):
+        def __init__(self, seed=""):
+            warnings.warn("deprecated", DeprecationWarning)
+            hashexpand.SHA256Expander.__init__(self)
+            self.seed(seed)
+
+        def seed(self, seed=None):
+            if seed is None:
+                seed = os.urandom(32)
+            hashexpand.SHA256Expander.seed(self, seed)
+except ImportError, le:
+    class InsecureSHA256Random:
+        def __init__(self, seed=None):
+            raise ImportError, le
+    class SHA256Random:
+        def __init__(self, seed=""):
+            raise ImportError, le
+
+class devrandomRandom(random.Random):
+    """ The problem with using this one, of course, is that it blocks.  This
+    is, of course, a security flaw.  (On Linux and probably on other
+    systems.) --Zooko 2005-03-04
+
+    Not repeatable.
+    """
+    def __init__(self):
+        warnings.warn("deprecated", DeprecationWarning)
+        self.dr = open("/dev/random", "r")
+
+    def get(self, bytes):
+        return self.dr.read(bytes)
+
+
+class devurandomRandom(random.Random):
+    """ The problem with using this one is that it gives answers even when it
+    has never been properly seeded, e.g. when you are booting from CD and have
+    just started up and haven't yet gathered enough entropy to actually be
+    unguessable.  (On Linux and probably on other systems.)  --Zooko 2005-03-04
+
+    Not repeatable.
+    """
+    def get(self, bytes):
+        warnings.warn("deprecated", DeprecationWarning)
+        return os.urandom(bytes)
+
+
+randobj = devurandomRandom()
+get = randobj.get
+random = randobj.random
+randrange = randobj.randrange
+shuffle = randobj.shuffle
+choice = randobj.choice
+seed = randobj.seed
+
+def randstr(n):
+    return ''.join(map(chr, map(randrange, [0]*n, [256]*n)))
+
+import random as insecurerandom
+def insecurerandstr(n):
+    return ''.join(map(chr, map(insecurerandom.randrange, [0]*n, [256]*n)))