From 714324a9a34f0958704e5064251a1f00ed37a372 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sybren=20A=2E=20St=C3=BCvel?= <sybren@stuvel.eu>
Date: Sun, 10 Jul 2011 12:05:33 +0200
Subject: Lot of refactorings:     - Added PKCS#1 module     - Moved some
 functionality to common.py     - simplified random number generation     -
 improved and extended doctests     - added changelog

---
 rsa/common.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'rsa/common.py')

diff --git a/rsa/common.py b/rsa/common.py
index b8f7aa6..7c852b6 100644
--- a/rsa/common.py
+++ b/rsa/common.py
@@ -14,5 +14,18 @@ def bit_size(number):
 
     '''
 
+    if number < 0:
+        raise ValueError('Only nonnegative numbers possible: %s' % number)
+
+    if number == 0:
+        return 1
+    
     return int(math.ceil(math.log(number, 2)))
 
+def byte_size(number):
+    """Returns the number of bytes required to hold a specific long number.
+    
+    The number of bytes is rounded up.
+    """
+
+    return int(math.ceil(bit_size(number) / 8.0))
-- 
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