- Fixed KeyBlock import/call for both new and older versions of impacket

- added venv subdir to gitignore file

.gitignore

@@ -1,4 +1,5 @@
 build/
+venv/
 *.egg-info
 dist/
 *.pyc

lib/utils/krbcredccache.py

@@ -1,8 +1,13 @@
 from impacket.krb5.constants import TicketFlags
-from impacket.krb5.ccache import CCache, Header, Credential, KeyBlock, Times, CountedOctetString, Principal, Ticket
+from impacket.krb5.ccache import CCache, Header, Credential, Times, CountedOctetString, Principal, Ticket
 from impacket.krb5 import types
 from pyasn1.codec.der import encoder
 
+try:
+    from impacket.krb5.ccache import KeyBlockV4
+except ImportError:
+    from impacket.krb5.ccache import KeyBlock
+
 class KrbCredCCache(CCache):
     """
     This is just the impacket ccache, but with an extra function to create it from
@@ -34,7 +39,10 @@ class KrbCredCCache(CCache):
         credential['server'] = tmpServer
         credential['is_skey'] = 0
 
-        credential['key'] = KeyBlock()
+        try:
+            credential['key'] = KeyBlockV4()
+        except NameError:
+            credential['key'] = KeyBlock()
         credential['key']['keytype'] = int(encASRepPart['key']['keytype'])
         credential['key']['keyvalue'] = bytes(encASRepPart['key']['keyvalue'])
         credential['key']['keylen'] = len(credential['key']['keyvalue'])