tree a46af9e9666d10da304e1843a5c98795128f1345
parent 3c55abd5fa1e3db40974b2e8d94f2ddce65fe40d
author Don Garrett <dgarrett@google.com> 1382733200 -0700
committer chrome-internal-fetch <chrome-internal-fetch@google.com> 1383350940 +0000

Allow a given payload to be signed more than once.

If the signature sizes don't change, we can insert signatures, and then
overwrite them without touching anything else. This makes it possible
for us to insert placeholder signatures, generate our hashes to be signed,
sign them, and then insert the signatures.

However, this doesn't change the command line arguments to take advantage of
this yet.

BUG=chromium:224453
TEST=Unittests (including one new one)

Change-Id: I7847edcee613bcc6da3e55d706a7e1bf95b5afaf
Reviewed-on: https://chromium-review.googlesource.com/174791
Reviewed-by: Chris Sosa <sosa@chromium.org>
Commit-Queue: Don Garrett <dgarrett@chromium.org>
Tested-by: Don Garrett <dgarrett@chromium.org>