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Add the openings of the PCs to the eVRF as necessary

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This commit is contained in:
Luke Parker
2024-07-22 18:13:57 -04:00
parent db31809708
commit 49a183194d
10 changed files with 281 additions and 50 deletions
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21
crypto/evrf/generalized-bulletproofs/src/transcript.rs
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@@ -14,6 +14,10 @@ const POINT: u8 = 1;
const CHALLENGE: u8 = 2;
fn challenge<F: PrimeField>(digest: &mut Blake2b512) -> F {
// Panic if this is such a wide field, we won't successfully perform a reduction into an unbiased
// scalar
debug_assert!((F::NUM_BITS + 128) < 512);
digest.update([CHALLENGE]);
let chl = digest.clone().finalize();
@@ -78,14 +82,16 @@ impl Transcript {
Self { digest, transcript: Vec::with_capacity(1024) }
}
pub(crate) fn push_scalar(&mut self, scalar: impl PrimeField) {
/// Push a scalar onto the transcript.
pub fn push_scalar(&mut self, scalar: impl PrimeField) {
self.digest.update([SCALAR]);
let bytes = scalar.to_repr();
self.digest.update(bytes);
self.transcript.extend(bytes.as_ref());
}
pub(crate) fn push_point(&mut self, point: impl GroupEncoding) {
/// Push a point onto the transcript.
pub fn push_point(&mut self, point: impl GroupEncoding) {
self.digest.update([POINT]);
let bytes = point.to_bytes();
self.digest.update(bytes);
@@ -132,7 +138,8 @@ impl<'a> VerifierTranscript<'a> {
Self { digest, transcript: proof }
}
pub(crate) fn read_scalar<C: Ciphersuite>(&mut self) -> io::Result<C::F> {
/// Read a scalar from the transcript.
pub fn read_scalar<C: Ciphersuite>(&mut self) -> io::Result<C::F> {
let scalar = C::read_F(&mut self.transcript)?;
self.digest.update([SCALAR]);
let bytes = scalar.to_repr();
@@ -140,7 +147,8 @@ impl<'a> VerifierTranscript<'a> {
Ok(scalar)
}
pub(crate) fn read_point<C: Ciphersuite>(&mut self) -> io::Result<C::G> {
/// Read a point from the transcript.
pub fn read_point<C: Ciphersuite>(&mut self) -> io::Result<C::G> {
let point = C::read_G(&mut self.transcript)?;
self.digest.update([POINT]);
let bytes = point.to_bytes();
@@ -172,4 +180,9 @@ impl<'a> VerifierTranscript<'a> {
pub fn challenge<F: PrimeField>(&mut self) -> F {
challenge(&mut self.digest)
}
/// Complete the transcript, returning the advanced slice.
pub fn complete(self) -> &'a [u8] {
self.transcript
}
}