Imported from SVN by Bitbucket

PasteScript-1.7.4.2-py2.6.egg/paste/script/util/secret.py

@@ -0,0 +1,32 @@
+# (c) 2005 Ian Bicking and contributors; written for Paste (http://pythonpaste.org)
+# Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
+"""
+Create random secrets.
+"""
+
+import os
+import random
+
+def random_bytes(length):
+    """
+    Return a string of the given length.  Uses ``os.urandom`` if it
+    can, or just pseudo-random numbers otherwise.
+    """
+    try:
+        return os.urandom(length)
+    except AttributeError:
+        return ''.join([
+            chr(random.randrange(256)) for i in xrange(length)])
+
+def secret_string(length=25):
+    """
+    Returns a random string of the given length.  The string
+    is a base64-encoded version of a set of random bytes, truncated
+    to the given length (and without any newlines).
+    """
+    s = random_bytes(length).encode('base64')
+    for badchar in '\n\r=':
+        s = s.replace(badchar, '')
+    # We're wasting some characters here.  But random characters are
+    # cheap ;)
+    return s[:length]