1 files changed, 47 insertions, 0 deletions
diff --git a/M2Crypto/BN.py b/M2Crypto/BN.py
new file mode 100755
index 0000000..ec741c0
--- /dev/null
+++ b/M2Crypto/BN.py
@@ -0,0 +1,47 @@
+"""
+M2Crypto wrapper for OpenSSL BN (BIGNUM) API.
+
+Copyright (c) 2005 Open Source Applications Foundation. All rights reserved.
+"""
+
+import m2
+
+def rand(bits, top=-1, bottom=0):
+    """
+    Generate cryptographically strong random number.
+    
+    @param bits:   Length of random number in bits.
+    @param top:    If -1, the most significant bit can be 0. If 0, the most
+                   significant bit is 1, and if 1, the two most significant
+                   bits will be 1.
+    @param bottom: If bottom is true, the number will be odd.
+    """
+    return m2.bn_rand(bits, top, bottom)
+
+
+def rand_range(range):
+    """
+    Generate a random number in a range.
+    
+    @param range: Upper limit for range.
+    @return:      A random number in the range [0, range)
+    """
+    return m2.bn_rand_range(range)
+
+
+def randfname(length):
+    """
+    Return a random filename, which is simply a string where all
+    the characters are from the set [a-zA-Z0-9].
+
+    @param length: Length of filename to return.
+    @type length:  int
+    @return:       random filename string
+    """
+    letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890'
+    lettersLen = len(letters)
+    fname = []
+    for x in range(length):
+        fname += [letters[m2.bn_rand_range(lettersLen)]]
+        
+    return ''.join(fname)