Struct sp_consensus_babe::Transcript
source · pub struct Transcript { /* private fields */ }
Expand description
A transcript of a public-coin argument.
The prover’s messages are added to the transcript using
append_message
, and the verifier’s
challenges can be computed using
challenge_bytes
.
Creating and using a Merlin transcript
To create a Merlin transcript, use Transcript::new()
. This
function takes a domain separation label which should be unique to
the application.
To use the transcript with a Merlin-based proof implementation,
the prover’s side creates a Merlin transcript with an
application-specific domain separation label, and passes a &mut
reference to the transcript to the proving function(s).
To verify the resulting proof, the verifier creates their own
Merlin transcript using the same domain separation label, then
passes a &mut
reference to the verifier’s transcript to the
verification function.
Implementing proofs using Merlin
For information on the design of Merlin and how to use it to implement a proof system, see the documentation at merlin.cool, particularly the Using Merlin section.
Implementations§
source§impl Transcript
impl Transcript
sourcepub fn new(label: &'static [u8]) -> Transcript
pub fn new(label: &'static [u8]) -> Transcript
Initialize a new transcript with the supplied label
, which
is used as a domain separator.
Note
This function should be called by a proof library’s API consumer (i.e., the application using the proof library), and not by the proof implementation. See the Passing Transcripts section of the Merlin website for more details on why.
sourcepub fn append_message(&mut self, label: &'static [u8], message: &[u8])
pub fn append_message(&mut self, label: &'static [u8], message: &[u8])
Append a prover’s message
to the transcript.
The label
parameter is metadata about the message, and is
also appended to the transcript. See the Transcript
Protocols section of
the Merlin website for details on labels.
sourcepub fn commit_bytes(&mut self, label: &'static [u8], message: &[u8])
👎Deprecated since 1.1.0: renamed to append_message for clarity.
pub fn commit_bytes(&mut self, label: &'static [u8], message: &[u8])
Deprecated. This function was renamed to
append_message
.
This is intended to avoid any possible confusion between the transcript-level messages and protocol-level commitments.
sourcepub fn append_u64(&mut self, label: &'static [u8], x: u64)
pub fn append_u64(&mut self, label: &'static [u8], x: u64)
Convenience method for appending a u64
to the transcript.
The label
parameter is metadata about the message, and is
also appended to the transcript. See the Transcript
Protocols section of
the Merlin website for details on labels.
Implementation
Calls append_message
with the 8-byte little-endian encoding
of x
.
sourcepub fn commit_u64(&mut self, label: &'static [u8], x: u64)
👎Deprecated since 1.1.0: renamed to append_u64 for clarity.
pub fn commit_u64(&mut self, label: &'static [u8], x: u64)
Deprecated. This function was renamed to
append_u64
.
This is intended to avoid any possible confusion between the transcript-level messages and protocol-level commitments.
sourcepub fn challenge_bytes(&mut self, label: &'static [u8], dest: &mut [u8])
pub fn challenge_bytes(&mut self, label: &'static [u8], dest: &mut [u8])
Fill the supplied buffer with the verifier’s challenge bytes.
The label
parameter is metadata about the challenge, and is
also appended to the transcript. See the Transcript
Protocols section of
the Merlin website for details on labels.
sourcepub fn build_rng(&self) -> TranscriptRngBuilder
pub fn build_rng(&self) -> TranscriptRngBuilder
Fork the current Transcript
to construct an RNG whose output is bound
to the current transcript state as well as prover’s secrets.
See the TranscriptRngBuilder
documentation for more details.
Trait Implementations§
source§impl Clone for Transcript
impl Clone for Transcript
source§fn clone(&self) -> Transcript
fn clone(&self) -> Transcript
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl SigningTranscript for Transcript
impl SigningTranscript for Transcript
We delegate SigningTranscript
methods to the corresponding
inherent methods of merlin::Transcript
and implement two
witness methods to avoid abrtasting the merlin::TranscriptRng
machenry.
source§fn commit_bytes(&mut self, label: &'static [u8], bytes: &[u8])
fn commit_bytes(&mut self, label: &'static [u8], bytes: &[u8])
merlin::Transcript
.source§fn challenge_bytes(&mut self, label: &'static [u8], dest: &mut [u8])
fn challenge_bytes(&mut self, label: &'static [u8], dest: &mut [u8])
merlin::Transcript
.source§fn witness_bytes_rng<R>(
&self,
label: &'static [u8],
dest: &mut [u8],
nonce_seeds: &[&[u8]],
rng: R
)where
R: RngCore + CryptoRng,
fn witness_bytes_rng<R>( &self, label: &'static [u8], dest: &mut [u8], nonce_seeds: &[&[u8]], rng: R )where R: RngCore + CryptoRng,
source§fn proto_name(&mut self, label: &'static [u8])
fn proto_name(&mut self, label: &'static [u8])
source§fn commit_point(
&mut self,
label: &'static [u8],
compressed: &CompressedRistretto
)
fn commit_point( &mut self, label: &'static [u8], compressed: &CompressedRistretto )
source§fn challenge_scalar(&mut self, label: &'static [u8]) -> Scalar
fn challenge_scalar(&mut self, label: &'static [u8]) -> Scalar
e
.Auto Trait Implementations§
impl RefUnwindSafe for Transcript
impl Send for Transcript
impl Sync for Transcript
impl Unpin for Transcript
impl UnwindSafe for Transcript
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