Signed-off-by: Balazs Lecz <[email protected]>
---
 lib/serializer.py |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/lib/serializer.py b/lib/serializer.py
index b568497..ec9c769 100644
--- a/lib/serializer.py
+++ b/lib/serializer.py
@@ -101,11 +101,13 @@ def LoadJson(txt):
   return simplejson.loads(txt)
 
 
-def DumpSignedJson(data, key, salt=None):
+def DumpSignedJson(data, key, salt=None, key_selector=None):
   """Serialize a given object and authenticate it.
 
   @param data: the data to serialize
   @param key: shared hmac key
+  @param key_selector: name/id that identifies the key (in case there are
+    multiple keys in use, e.g. in a multi-cluster environment)
   @return: the string representation of data signed by the hmac key
 
   """
@@ -117,6 +119,8 @@ def DumpSignedJson(data, key, salt=None):
     'salt': salt,
     'hmac': hmac.new(key, salt + txt, sha1).hexdigest(),
   }
+  if key_selector:
+    signed_dict['key_selector'] = key_selector
   return DumpJson(signed_dict, indent=False)
 
 
-- 
1.6.6.2

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