DO NOT MERGE: Add a checker for signature boundary in verifier am: f616da1726 am: 5346da0220  -s ours am: a41cc29447  -s ours am: 051dfa7ec3  -s ours
am: 94c8b5e5a6

Change-Id: I42132e10d5ba4cdf77232dadb88100e6c29acf80