feat(zcash): Orchard shielded signing engine - #346
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The device-side Orchard engine behind Zcash shielded sends: Orchard key derivation from the wallet seed, note/action handling, RedPallas signing over the Pallas curve, and unified-address encoding (ZIP-316). - Signing is constant-time on the secret scalar path; the Pallas arithmetic comes from the pinned trezor-firmware fork and is compiled in only when the privacy engine is enabled, so the bitcoin-only image carries none of it. - Progress is reported to the host during action signing — multi-action transactions take long enough that a silent device looks hung. - messages-zcash proto/options are registered with the transport generator. Handlers, host-visible messages, unit tests, the constant-time CI gates and the coin-integration docs land in the Zcash wiring branch; this commit adds the engine and its build wiring only.
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Superseded by the smaller audit-ready 7.15 stack: #359 release foundation, #360 authenticated clear-signing, #361 recovery and entropy, #362 Zcash Orchard, #363 chain integrations, and #364 Bitcoin/release security. All release changes remain preserved in the replacement branches and preservation tags. The replacement aggregate was tree-verified against the prior release and passed the local CI-equivalent container suite (405 firmware, 2 board, 18 crypto, and 7 Pallas constant-time tests). GitHub-hosted checks have been explicitly dispatched and are currently queued. |
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7.15 review stack position 05/17.
This PR is intentionally one coherent commit, based on
feature/715-04-clearsign-metadata, for individual auditing.The full stack is linear from the clean fork
developat 1af2ffe.Review scope: feat(zcash): Orchard shielded signing engine.
The preserved pre-restage candidate remains available at
preserve/alpha-2026-08-05.