Zcash shielded transactions

[krnak]

Orchard shielded transactions for Trezor T.

work in progress . you can use this PR for tracking my activity

Links

ZFND grant documentation milestone M.1 report milestone M.2 report

Orchard addresses and keys

• [x] orchard addresses
• [x] unified addresses
• [x] viewing keys export
• [x] layouts
• [x] ZIP-32 support Connectivity:
• [x] trezorlib.zcash module
• [x] trezorctl zcash commands
• [ ] Connect support Tests:
• [x] unit tests
• [x] tests on real device
• [x] reviewed
• [ ] typing

Orchard transactions

• [x] v5 transaction format
• [x] signing workflow
• [x] orchard inputs and outputs
• [x] ZIP-244 (txid and sighash) implementation
• [x] layouts
• [ ] graphically distinguish transparent and orchard outputs
• [x] mixed transactions (transparent + orchard) Connectivity:
• [x] python bridge to orchard crate (pyorchard) e.i. the prover is callable from python
• [x] trezorlib.zcash module (raw version)
• [ ] trezorctl zcash commands
• [ ] Connect support Tests:
• [ ] unit tests
• [ ] tests on real device
• [ ] typing
• [ ] reviewed

Zcash crates

• [x] librustzcash https://github.com/zcash/librustzcash/pull/450
• [x] librustzcash https://github.com/zcash/librustzcash/pull/446
• [x] pasta_curves https://github.com/zcash/pasta_curves/pull/4
• [x] reddsa https://github.com/ZcashFoundation/reddsa/pull/11
• [ ] orchard https://github.com/zcash/orchard/pull/309
• [x] orchard https://github.com/zcash/orchard/issues/297
• [ ] orchard https://github.com/zcash/orchard/issues/287
• [x] orchard https://github.com/zcash/orchard/pull/299

Firmware team

• [ ] reserve more memory for Zcash app
• [ ] integrate Sinsemilla table
• [x] ~check Rust allocator correctness~
• [ ] implementation review

Documentation

• [ ] implementation documentation (need to be updated)
• [x] M.1 report
• [x] M.2 report
• [ ] M.3 report

[krnak]

I request a first quick review to make sure that the style of my code is correct and that I use other modules correctly.

Please, focus on:

common/protob/messages-zcash.proto
core/src/apps/zcash/
core/embed/rust/
core/tests/
python/src/trezorlib

and don't care about diagnostic machinary like

core/embed/rust/src/zcash/diag.rs

and PanicInfo printing in

core/embed/rust/src/lib.rs

Also don't care about external crates.

[krnak]

And I accidentally merged some ethereum end vendor related commits. So ignore them too.

[krnak]

replacing this by #2472