services/presence/psutils.py: don't bother using sugar.util, it's easier to use hexdigest or sha directly

services/presence/psutils.py

@@ -17,12 +17,15 @@
 
 import logging
 from string import ascii_letters, digits
+try:
+    from hashlib import sha1
+except ImportError:
+    # Python < 2.5
+    from sha import new as sha1
 
 import dbus
 import gobject
 
-from sugar import util
-
 
 _logger = logging.getLogger('s-p-s.psutils')
 
@@ -39,7 +42,7 @@ def pubkey_to_keyid(key):
     :Returns:
         The key ID as a string of hex digits
     """
-    return util.printable_hash(util._sha_data(key))
+    return sha1(key).hexdigest()
 
 
 def escape_identifier(identifier):