mirror of
https://github.com/serai-dex/serai.git
synced 2024-12-27 14:09:48 +00:00
35 lines
1.8 KiB
Markdown
35 lines
1.8 KiB
Markdown
# 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).
|
|
- `RecommendedTranscript`, a transcript recommended for usage in applications.
|
|
Currently, this is `DigestTranscript<Blake2b512>` (available via the
|
|
`recommended` 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`.
|
|
|
|
This library was
|
|
[audited by Cypher Stack in March 2023](https://github.com/serai-dex/serai/raw/e1bb2c191b7123fd260d008e31656d090d559d21/audits/Cypher%20Stack%20crypto%20March%202023/Audit.pdf),
|
|
culminating in commit
|
|
[669d2dbffc1dafb82a09d9419ea182667115df06](https://github.com/serai-dex/serai/tree/669d2dbffc1dafb82a09d9419ea182667115df06).
|
|
Any subsequent changes have not undergone auditing.
|
|
|
|
This library is usable under no_std.
|