tree 708cf91d1f2efd8cd2a5e98f5b35c5faac695a48
parent 83f1828acca76fa142bb0ff454e6cb37a58afa78
author Erick Tryzelaar <etryzelaar@google.com> 1555181534 -0700
committer Erick Tryzelaar <etryzelaar@google.com> 1555953173 -0700

G1: Parse TUF-1.0 key ids if present

To ease transition to TUF-1.0, this patch allows go-tuf to both
consume TUF-0.9 and TUF-1.0 metadata, but produce TUF-0.9 metadata
that's still compatible with the original go-tuf 0.9. It does
this by defaulting to generating TUF-0.9 key ids, but if go-tuf
receives metadata produced by TUF-1.0, it will parse out both
the 0.9 and 1.0 key ids.

Note that it is only safe for this version of go-tuf to produce
TUF-0.9 metadata based off of other TUF-0.9 metadata. It will produce
incorrect metadata or error out if it is used to advance TUF-1.0
metadata.

Change-Id: I87fffdc17a5456f7e04f990fbd2a0e060340125a