snark_verifier::system::halo2::transcript::halo2

Struct PoseidonTranscript

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pub struct PoseidonTranscript<C, L, S, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize>
where
    C: CurveAffine,
    L: Loader<C>,
{
    pub loaded_stream: Vec<TranscriptObject<C, L>>,
    /* private fields */
}
Expand description

Transcript for verifier in halo2_proofs circuit using poseidon hasher. Currently It assumes the elliptic curve scalar field is same as native field.

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§loaded_stream: Vec<TranscriptObject<C, L>>

Only relevant for Halo2 loader: as elements from stream are read, they are assigned as witnesses. The loaded witnesses are pushed to loaded_stream. This way at the end we have the entire proof transcript as loaded witnesses.

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impl<C, R, EccChip, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> PoseidonTranscript<C, Rc<Halo2Loader<C, EccChip>>, R, T, RATE, R_F, R_P>
where C: CurveAffine, R: Read, EccChip: NativeEncoding<C>,

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pub fn new<const SECURE_MDS: usize>( loader: &Rc<Halo2Loader<C, EccChip>>, stream: R, ) -> Self
where C::Scalar: FieldExt,

Initialize PoseidonTranscript given readable or writeable stream for verifying or proving with NativeLoader.

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pub fn from_spec( loader: &Rc<Halo2Loader<C, EccChip>>, stream: R, spec: OptimizedPoseidonSpec<C::Scalar, T, RATE>, ) -> Self

Initialize PoseidonTranscript from a precomputed spec of round constants and MDS matrix because computing the constants is expensive.

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pub fn new_stream(&mut self, stream: R)

Clear the buffer and set the stream to a new one. Effectively the same as starting from a new transcript.

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impl<C: CurveAffine, S, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> PoseidonTranscript<C, NativeLoader, S, T, RATE, R_F, R_P>

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pub fn new<const SECURE_MDS: usize>(stream: S) -> Self
where C::Scalar: FieldExt,

Initialize PoseidonTranscript given readable or writeable stream for verifying or proving with NativeLoader.

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pub fn from_spec( stream: S, spec: OptimizedPoseidonSpec<C::Scalar, T, RATE>, ) -> Self

Initialize PoseidonTranscript from a precomputed spec of round constants and MDS matrix because computing the constants is expensive.

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pub fn new_stream(&mut self, stream: S)

Clear the buffer and set the stream to a new one. Effectively the same as starting from a new transcript.

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impl<C: CurveAffine, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> PoseidonTranscript<C, NativeLoader, Vec<u8>, T, RATE, R_F, R_P>

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pub fn clear(&mut self)

Clear the buffer and stream.

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impl<C, W, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> PoseidonTranscript<C, NativeLoader, W, T, RATE, R_F, R_P>
where C: CurveAffine, W: Write,

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pub fn stream_mut(&mut self) -> &mut W

Returns mutable stream.

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pub fn finalize(self) -> W

Finalize transcript and returns stream.

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impl<C, L, S: Debug, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> Debug for PoseidonTranscript<C, L, S, T, RATE, R_F, R_P>
where C: CurveAffine + Debug, L: Loader<C> + Debug, C::Scalar: Debug,

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

Formats the value using the given formatter. Read more
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impl<C: CurveAffine, S, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> Transcript<C, ChallengeScalar<C>> for PoseidonTranscript<C, NativeLoader, S, T, RATE, R_F, R_P>

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fn squeeze_challenge(&mut self) -> ChallengeScalar<C>

Squeeze an encoded verifier challenge from the transcript.
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fn common_point(&mut self, ec_point: C) -> Result<()>

Writing the point to the transcript without writing it to the proof, treating it as a common input.
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fn common_scalar(&mut self, scalar: C::Scalar) -> Result<()>

Writing the scalar to the transcript without writing it to the proof, treating it as a common input.
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fn squeeze_challenge_scalar<T>(&mut self) -> ChallengeScalar<C, T>

Squeeze a typed challenge (in the scalar field) from the transcript.
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impl<C: CurveAffine, S, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> Transcript<C, NativeLoader> for PoseidonTranscript<C, NativeLoader, S, T, RATE, R_F, R_P>

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fn loader(&self) -> &NativeLoader

Returns Loader.
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fn squeeze_challenge(&mut self) -> C::Scalar

Squeeze a challenge.
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fn common_scalar(&mut self, scalar: &C::Scalar) -> Result<(), Error>

Update with a scalar.
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fn common_ec_point(&mut self, ec_point: &C) -> Result<(), Error>

Update with an elliptic curve point.
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fn squeeze_n_challenges(&mut self, n: usize) -> Vec<L::LoadedScalar>

Squeeze n challenges.
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impl<C, R, EccChip, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> Transcript<C, Rc<Halo2Loader<C, EccChip>>> for PoseidonTranscript<C, Rc<Halo2Loader<C, EccChip>>, R, T, RATE, R_F, R_P>
where C: CurveAffine, R: Read, EccChip: NativeEncoding<C>,

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fn loader(&self) -> &Rc<Halo2Loader<C, EccChip>>

Returns Loader.
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fn squeeze_challenge(&mut self) -> Scalar<C, EccChip>

Squeeze a challenge.
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fn common_scalar(&mut self, scalar: &Scalar<C, EccChip>) -> Result<(), Error>

Update with a scalar.
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fn common_ec_point( &mut self, ec_point: &EcPoint<C, EccChip>, ) -> Result<(), Error>

Update with an elliptic curve point.
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fn squeeze_n_challenges(&mut self, n: usize) -> Vec<L::LoadedScalar>

Squeeze n challenges.
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impl<C, R, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> TranscriptRead<C, ChallengeScalar<C>> for PoseidonTranscript<C, NativeLoader, R, T, RATE, R_F, R_P>
where C: CurveAffine, R: Read,

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fn read_point(&mut self) -> Result<C>

Read a curve point from the prover.
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fn read_scalar(&mut self) -> Result<C::Scalar>

Read a curve scalar from the prover.
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impl<C, R, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> TranscriptRead<C, NativeLoader> for PoseidonTranscript<C, NativeLoader, R, T, RATE, R_F, R_P>
where C: CurveAffine, R: Read,

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fn read_scalar(&mut self) -> Result<C::Scalar, Error>

Read a scalar.
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fn read_ec_point(&mut self) -> Result<C, Error>

Read a elliptic curve point.
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fn read_n_scalars(&mut self, n: usize) -> Result<Vec<L::LoadedScalar>, Error>

Read n scalar.
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fn read_n_ec_points(&mut self, n: usize) -> Result<Vec<L::LoadedEcPoint>, Error>

Read n elliptic curve point.
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impl<C, R, EccChip, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> TranscriptRead<C, Rc<Halo2Loader<C, EccChip>>> for PoseidonTranscript<C, Rc<Halo2Loader<C, EccChip>>, R, T, RATE, R_F, R_P>
where C: CurveAffine, R: Read, EccChip: NativeEncoding<C>,

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fn read_scalar(&mut self) -> Result<Scalar<C, EccChip>, Error>

Read a scalar.
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fn read_ec_point(&mut self) -> Result<EcPoint<C, EccChip>, Error>

Read a elliptic curve point.
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fn read_n_scalars(&mut self, n: usize) -> Result<Vec<L::LoadedScalar>, Error>

Read n scalar.
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fn read_n_ec_points(&mut self, n: usize) -> Result<Vec<L::LoadedEcPoint>, Error>

Read n elliptic curve point.
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impl<C, R, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> TranscriptReadBuffer<R, C, ChallengeScalar<C>> for PoseidonTranscript<C, NativeLoader, R, T, RATE, R_F, R_P>
where C: CurveAffine, C::Scalar: FieldExt, R: Read,

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fn init(reader: R) -> Self

Initialize a transcript given an input buffer.
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impl<C, W, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> TranscriptWrite<C> for PoseidonTranscript<C, NativeLoader, W, T, RATE, R_F, R_P>
where C: CurveAffine, W: Write,

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fn write_scalar(&mut self, scalar: C::Scalar) -> Result<(), Error>

Write a scalar.
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fn write_ec_point(&mut self, ec_point: C) -> Result<(), Error>

Write a elliptic curve point.
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impl<C, W, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> TranscriptWrite<C, ChallengeScalar<C>> for PoseidonTranscript<C, NativeLoader, W, T, RATE, R_F, R_P>
where C: CurveAffine, W: Write,

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fn write_point(&mut self, ec_point: C) -> Result<()>

Write a curve point to the proof and the transcript.
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fn write_scalar(&mut self, scalar: C::Scalar) -> Result<()>

Write a scalar to the proof and the transcript.
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impl<C, W, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> TranscriptWriterBuffer<W, C, ChallengeScalar<C>> for PoseidonTranscript<C, NativeLoader, W, T, RATE, R_F, R_P>
where C: CurveAffine, C::Scalar: FieldExt, W: Write,

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fn init(writer: W) -> Self

Initialize a transcript given an output buffer.
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fn finalize(self) -> W

Conclude the interaction and return the output buffer (writer).

Auto Trait Implementations§

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impl<C, L, S, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> Freeze for PoseidonTranscript<C, L, S, T, RATE, R_F, R_P>
where L: Freeze, S: Freeze, <L as ScalarLoader<<C as CurveAffine>::ScalarExt>>::LoadedScalar: Freeze, <C as CurveAffine>::ScalarExt: Freeze,

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impl<C, L, S, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> RefUnwindSafe for PoseidonTranscript<C, L, S, T, RATE, R_F, R_P>
where L: RefUnwindSafe, S: RefUnwindSafe, <L as ScalarLoader<<C as CurveAffine>::ScalarExt>>::LoadedScalar: RefUnwindSafe, <C as CurveAffine>::ScalarExt: RefUnwindSafe, <L as EcPointLoader<C>>::LoadedEcPoint: RefUnwindSafe,

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impl<C, L, S, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> Send for PoseidonTranscript<C, L, S, T, RATE, R_F, R_P>
where L: Send, S: Send, <L as ScalarLoader<<C as CurveAffine>::ScalarExt>>::LoadedScalar: Send, <L as EcPointLoader<C>>::LoadedEcPoint: Send,

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impl<C, L, S, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> Sync for PoseidonTranscript<C, L, S, T, RATE, R_F, R_P>
where L: Sync, S: Sync, <L as ScalarLoader<<C as CurveAffine>::ScalarExt>>::LoadedScalar: Sync, <L as EcPointLoader<C>>::LoadedEcPoint: Sync,

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impl<C, L, S, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> Unpin for PoseidonTranscript<C, L, S, T, RATE, R_F, R_P>
where L: Unpin, S: Unpin, <L as ScalarLoader<<C as CurveAffine>::ScalarExt>>::LoadedScalar: Unpin, <C as CurveAffine>::ScalarExt: Unpin, <L as EcPointLoader<C>>::LoadedEcPoint: Unpin,

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impl<C, L, S, const T: usize, const RATE: usize, const R_F: usize, const R_P: usize> UnwindSafe for PoseidonTranscript<C, L, S, T, RATE, R_F, R_P>
where L: UnwindSafe, S: UnwindSafe, <L as ScalarLoader<<C as CurveAffine>::ScalarExt>>::LoadedScalar: UnwindSafe, <C as CurveAffine>::ScalarExt: UnwindSafe, <L as EcPointLoader<C>>::LoadedEcPoint: UnwindSafe,

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