SOP support for v6 Interop Tests

[falko-strenzke]

For the Sequoia Interop Tests, the sequoia team wrote an SOP wrapper/module for RNP.

We should consider supporting our v6 functionality also through this SOP interface if this is possible without investing too much time.

Tasks are:

• extend the Rust SOP wrapper for RNP to use our v6 functionality

Test cases that are relevant to our implemented v6 functionality:

• https://tests.sequoia-pgp.org/#Asymmetric_Encryption (this seems to be a v6 test (!?)

@TJ-91

[falko-strenzke]

Look at Interop Test Suite, then possibly clarify what is left to do.

[TJ-91]

Changes would need to go here: https://gitlab.com/sequoia-pgp/rnp-sop/-/blob/main/src/lib.rs (Plus, requires RNP to be built with the experimental flags).

However, I am not convinced we should do this. What do you think? Can we close it as not planned?

[falko-strenzke]

I wouldn't close it. Maybe this is not urgent, but it still makes sense to consider it for later.

[falko-strenzke]

One Problem here is that the v6 and PQC FFI is still only experimental.