Multiple verifier reference identities.

(Imported from upstream's 8abffa4a73fcbf6536e0a42d736ed9211a8204ea,
9624b50d51de25bb2e3a72e81fe45032d80ea5c2 and
41e3ebd5abacfdf98461cdeb6fa97a4175b7aad3.)

Change-Id: Ic9099eb5704b19b4500229e89351371cc6184f9d
4 files changed