tlog: Add shared primitives for MTC transparency logs#8792
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Add tlog, a library that three forthcoming components will share: the MTCA, which writes the tree; the MTPublisher, which reads it and pushes it to mirrors; and the tlog-mirror-test-srv, which receives it and provides cosignatures. It implements the common parts of the C2SP tlog-tiles, tlog-checkpoint, and tlog-cosignature specifications, plus the Merkle Tree Certificate subtree extension.
Most of the primitives come from golang.org/x/mod/sumdb/tlog and golang.org/x/mod/sumdb/note, which already cover RFC 6962 hashing, proofs, tile reading, and signed notes. This package adds the rest:
Proof generation reads hashes through a caller-supplied tlog.HashReader, verification takes only public keys, and signing goes through a caller-supplied note.Signer.