The TSS2 parser was the only thing in the repository that used this module, and
it brought 302 modules into the graph to do it — 35 of them linters, along with
Google Cloud KMS and IAM, the AWS SDK and a terminal styling library. Those are
the module's own development dependencies, which minimal version selection turns
into floors in ours, and they are the whole reason gRPC, protobuf, the AWS SDK,
OpenTelemetry, logrus and five x/ packages had moved. Management, signal, relay
and proxy inherited every one of them for a feature none of them runs.
Removing the import is not enough, because tidy never downgrades: the raised
floors stay written in go.mod. Each one is pinned back to the version main had,
then tidy is left to raise again whatever something still genuinely needs. It
raised nothing: all 43 are back where they were, and go-tpm was already in the
graph at the same version, so the certificate feature now costs no new module at
all.
The differential tests go with it. They existed to check the swap against the
library while both were present, and there is nothing left to compare against.
The TSS2 parser was the only reason this repository depended on a crypto suite
whose own build tooling it inherits. The replacement sits on go-tpm, which was
already a direct dependency and is in fact what that suite calls underneath, so
this removes a wrapper rather than porting onto a different library: the load,
the derived storage root key and the signing commands are the same calls.
Swapping a parser on the one path a customer actually runs is not something to
assert, so the two are held side by side for this commit. One test feeds the
replacement bytes the old library wrote and requires the same key type, empty
auth flag, parent handle, blobs and decoded public key; the other feeds both the
fixtures the tests are built on, so those are the shape the format calls for and
not merely the shape the new parser reads. The scaffolding goes away with the
dependency in the commit that follows.
The encoder behind the fixtures is written out separately from the parser under
test, so an encoder bug and a decoder bug cannot cancel each other out.
riccardom