Add support for wrapping asymmetric keys #41
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This will ensure that deserialization still works
robin-nitrokey
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Oct 17, 2024
This will be useful for PIV encryption, working together with trussed-dev/trussed-auth#41 This implements the standard HPKE from [RFC 9180](https://www.rfc-editor.org/rfc/rfc9180.html). This uses a custom implmentation instead of the `hpke` crate because this crate seals the trait to implement custom ciphers, and we want to use `ChaCha8` and not `ChaCha20`. The implementation is tested against the RFC test vectors for `ChaCha20`, and is made generic so that the same code can be used for `ChaCha8` in the backend. For ChaCha8Poly1305 AEAD ID, I used a custom `0xFFFE`, which is probably unused. I need to look if there is somewhere someone already using ChaCha8Poly1305 for HPKE and if there is a specified ID.
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This will be required for PIV encryption at rest of data on the external filesystem like Opcard currently does.
Symmetric keys are not enough for PIV because the admin is not authenticated with a PIN (but rather with a AES/TDES key handshake).