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serai/crypto/transcript
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Luke Parker 05dc474cb3
Correct std feature-flagging 
If a crate has std set, it should enable std for all dependencies in order to
let them properly select which algorithms to use. Some crates fallback to
slower/worse algorithms on no-std.

Also more aggressively sets default-features = false leading to a *10%*
reduction in the amount of crates coordinator builds.
2023-10-31 07:44:02 -04:00
..
src Use the newly stabilized div_ceil 2023-10-05 14:28:03 -04:00
Cargo.toml Correct std feature-flagging 2023-10-31 07:44:02 -04:00
LICENSE Update licenses 2023-01-11 23:05:31 -05:00
README.md Add no_std support to transcript, dalek-ff-group, ed448, ciphersuite, multiexp, schnorr, and monero-generators 2023-04-22 04:38:47 -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).
  • 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, culminating in commit 669d2dbffc1dafb82a09d9419ea182667115df06. Any subsequent changes have not undergone auditing.

This library is usable under no_std.