Struct flexible_transcript::MerlinTranscript

pub struct MerlinTranscript(_);

Available on crate feature merlin only.

A wrapper around a Merlin transcript which satisfiees the Transcript API.

Challenges are fixed to 64 bytes, despite Merlin supporting variable length challenges.

This implementation is intended to remain in the spirit of Merlin more than it’s intended to be in the spirit of the provided DigestTranscript. While DigestTranscript uses flags for each of its different field types, the domain_separate function simply appends a message with a label of “dom-sep”, Merlin’s preferred domain separation label. Since this could introduce transcript conflicts between a domain separation and a message with a label of “dom-sep”, the append_message function uses an assertion to prevent such labels.

Trait Implementations

impl Clone for MerlinTranscript

fn clone(&self) -> MerlinTranscript

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MerlinTranscript

fn fmt(&self, fmt: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Transcript for MerlinTranscript

type Challenge = [u8; 64]

fn new(name: &'static [u8]) -> Self

Create a new transcript with the specified name.

fn domain_separate(&mut self, label: &'static [u8])

Apply a domain separator to the transcript.

fn append_message<M: AsRef<[u8]>>(&mut self, label: &'static [u8], message: M)

Append a message to the transcript.

fn challenge(&mut self, label: &'static [u8]) -> Self::Challenge

Produce a challenge.

fn rng_seed(&mut self, label: &'static [u8]) -> [u8; 32]

Produce a RNG seed.