AU: Add support for signing of update payloads after they're generated.

AU: Add support for signing of update payloads after they're generated.

The change adds 2 methods -- one that takes an unsigned payload and a raw
signature size and returns the hash that needs to be signed, and another one
that takes an unsigned payload and a raw signature and generates the signed
payload.

BUG=chromium-os:10872
TEST=unit tests

Change-Id: I65bbe72a1ec67e603e78508c33893695b7de0e6a

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=9574f7e

[petkov, 2011-01-13 01:10:13]

Here's the basic functionality for signing of generated payloads. Note that this
CL doesn't include any command line options to expose the functionality yet (but
includes unit tests to test it).

At some point we may want to delete the old code that allows signing at payload
generation time so that we don't need to worry about maintaining it.

[adlr, 2011-01-13 02:27:29]

LGTM w/ nit.

thanks!

http://codereview.chromium.org/6265001/diff/3001/payload_signer.cc
File payload_signer.cc (right):

http://codereview.chromium.org/6265001/diff/3001/payload_signer.cc#newcode28
payload_signer.cc:28: bool SerializeSignature(const vector<char> signature,
this function name w/ the args is a bit confusing. Maybe call it
"ProtobufizeRawSignature()"?

[petkov, 2011-01-13 18:47:14]

Thanks. Pushing...

http://codereview.chromium.org/6265001/diff/3001/payload_signer.cc
File payload_signer.cc (right):

http://codereview.chromium.org/6265001/diff/3001/payload_signer.cc#newcode28
payload_signer.cc:28: bool SerializeSignature(const vector<char> signature,
On 2011/01/13 02:27:29, adlr wrote:
> this function name w/ the args is a bit confusing. Maybe call it
> "ProtobufizeRawSignature()"?

Done. Renamed to ConvertSignatureToProtobufBlob.