contracts: implement calldata encryption in Solidity

CedarMist commented 1 month ago

Fixes: #428

HMAC SHA512-256 (but discovered that was unnecessary. Included anyway as it may be useful.)
Introduces subcall_static to perform subcall with staticcall, makes several Subcall methods view
Split CBOR stuff into its own file + tests.
Allow passing manual nonce to Cipher for encryption (useful for tests & reproducibility)
Various changes to clean up solhint warnings
Transaction calldata encryption + tests

Re: CBOR, I split the CBOR related stuff into individual functions, as otherwise you start needing to deploy the whole CBOR library on its own an link it into a library, whereas using individual function they get pulled in as & when necessary.

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CedarMist commented 1 month ago

Unfortunately splitting a small PR into lots of even smaller minor PRs is also very tedious. I can re-commit them as individual commits within the PR (that would be slightly less tedious)?

oasisprotocol / sapphire-paratime