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Add hpke backend #25

Merged
merged 2 commits into from
Oct 17, 2024
Merged

Add hpke backend #25

merged 2 commits into from
Oct 17, 2024

Commits on Oct 17, 2024

  1. Add HPKE extension 

    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.
    @sosthene-nitrokey @robin-nitrokey
    sosthene-nitrokey authored and robin-nitrokey committed Oct 17, 2024
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  2. Release trussed-staging v0.3.2, trussed-hpke v0.1.0

    @robin-nitrokey
    robin-nitrokey committed Oct 17, 2024
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