diff -Nru simplestreams-0.1.0~bzr354/debian/changelog simplestreams-0.1.0~bzr354/debian/changelog
--- simplestreams-0.1.0~bzr354/debian/changelog	2015-09-23 20:07:12.000000000 -0400
+++ simplestreams-0.1.0~bzr354/debian/changelog	2015-09-25 11:20:00.000000000 -0400
@@ -1,3 +1,11 @@
+simplestreams (0.1.0~bzr354-0ubuntu1.15.04.2) vivid-proposed; urgency=high
+
+  * export checksummer in simplestreams.util (LP: #1499749)
+    Users of simplestreams.util checksummer would get an AttributeError
+    because this was moved.
+
+ -- Scott Moser <smoser@ubuntu.com>  Fri, 25 Sep 2015 11:19:55 -0400
+
 simplestreams (0.1.0~bzr354-0ubuntu1.15.04.1) vivid-security; urgency=medium
 
   * SECURITY UPDATE: insufficient verification of GPG signatures
diff -Nru simplestreams-0.1.0~bzr354/debian/patches/lp1499749-export-checksummer-in-util.patch simplestreams-0.1.0~bzr354/debian/patches/lp1499749-export-checksummer-in-util.patch
--- simplestreams-0.1.0~bzr354/debian/patches/lp1499749-export-checksummer-in-util.patch	1969-12-31 19:00:00.000000000 -0500
+++ simplestreams-0.1.0~bzr354/debian/patches/lp1499749-export-checksummer-in-util.patch	2015-09-25 11:18:24.000000000 -0400
@@ -0,0 +1,30 @@
+Author: Scott Moser <smoser@ubuntu.com>
+Bug: https://bugs.launchpad.net/bugs/1499749
+Description: export checksummer in simplestreams.util
+Applied-Upstream: rev 401
+
+------------------------------------------------------------
+revno: 401
+fixes bug: https://launchpad.net/bugs/1499749
+committer: Scott Moser <smoser@ubuntu.com>
+branch nick: trunk
+timestamp: Fri 2015-09-25 10:49:02 -0400
+message:
+  export checksummer in simplestreams.util
+  
+  When moving the checksumming things out of checksum_util, I added
+  names for CHECKSUMS, item_checksums and ALGORITHMS, but failed to
+  get checksummer.
+  
+  Simply export checksummer in util, pointing it to checksum_util.util
+=== modified file 'simplestreams/util.py'
+--- a/simplestreams/util.py
++++ b/simplestreams/util.py
+@@ -563,6 +563,7 @@ class ProgressAggregator(object):
+ CHECKSUMS = checksum_util.CHECKSUMS
+ item_checksums = checksum_util.item_checksums
+ ALGORITHMS = checksum_util.ALGORITHMS
++checksummer = checksum_util.checksummer
+ 
+ 
+ # vi: ts=4 expandtab
diff -Nru simplestreams-0.1.0~bzr354/debian/patches/series simplestreams-0.1.0~bzr354/debian/patches/series
--- simplestreams-0.1.0~bzr354/debian/patches/series	2015-09-23 19:50:54.000000000 -0400
+++ simplestreams-0.1.0~bzr354/debian/patches/series	2015-09-25 11:18:19.000000000 -0400
@@ -1,3 +1,4 @@
 glance-upload-i386-image-as-i686.patch
 lp1487004-use-checksumming-reader.patch
 lp1487004-sru-safetynet.patch
+lp1499749-export-checksummer-in-util.patch