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serai/crypto/transcript
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Luke Parker 1430b189bf
Enable no_std on transcript 
Removes the Vec challenge for an associated type.

Fixes the merlin feature which was horribly broken.

Also adds no_std to dalek-ff-group.
2022-06-28 04:02:56 -04:00
..
src Enable no_std on transcript 2022-06-28 04:02:56 -04:00
Cargo.toml Enable no_std on transcript 2022-06-28 04:02:56 -04:00
LICENSE Transcript crate with both a merlin backend and a basic label len value backend 2022-05-03 07:20:24 -04:00
README.md Rename transcript-trait to flexible-transcript 2022-06-27 09:02:21 -04:00

README.md

Flexible Transcript

Flexible Transcript is a crate offering:

  • Transcript, a trait offering functions transcripts should implement.
  • DigestTranscript, a competent transcript format instantiated against a provided hash function.
  • MerlinTranscript, a wrapper of merlin into the trait (available via the merlin feature).

The trait was created while working on an IETF draft which defined an incredibly simple transcript format. Extensions of the protocol would quickly require a more competent format, yet implementing the one specified was mandatory to meet the specification. Accordingly, the library implementing the draft defined an IetfTranscript, dropping labels and not allowing successive challenges, yet thanks to the trait, allowed protocols building on top to provide their own transcript format as needed.

DigestTranscript takes in any hash function implementing Digest, offering a secure transcript format around it. All items are prefixed by a flag, denoting their type, and their length.

MerlinTranscript was used to justify the API, and if any issues existed with DigestTranscript, enable a fallback. It was also meant as a way to be compatible with existing Rust projects using merlin.