fix missing import. fixes #738

[electrum-nvc.git] / lib / x509.py

diff --git a/lib/x509.py b/lib/x509.py
index 31d5c80..e2021df 100644 (file)
--- a/lib/x509.py
+++ b/lib/x509.py
@@ -17,7 +17,8 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 
-from datetime import datetime, timedelta
+from datetime import datetime
+import sys
 
 try:
     import pyasn1
@@ -56,7 +57,10 @@ def decode_str(data):
 
 
 class X509(tlslite.X509):
-    """ Child class of tlslite.X509 that uses pyasn1 """
+    """Child class of tlslite.X509 that uses pyasn1 to parse cert
+    information. Note: pyasn1 is a lot slower than tlslite, so we
+    should try to do everything in tlslite.
+    """
 
     def slow_parse(self):
         self.cert = decoder.decode(str(self.bytes), asn1Spec=Certificate())[0]