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Nizk

sigma_proofs

Struct Nizk 

Source 
pub struct Nizk<P>
where
    P: SigmaProtocol,
    P::Challenge: PartialEq,
{
    pub session_id: Vec<u8>,
    pub interactive_proof: P,
}
Expand description

A Fiat-Shamir transformation of a SigmaProtocol into a non-interactive proof.

Nizk wraps an interactive Sigma protocol P and a hash-based codec C, to produce non-interactive proofs.

It manages the domain separation, codec reset, proof generation, and proof verification.

§Type Parameters

  • P: the Sigma protocol implementation.
  • C: the codec used for Fiat-Shamir.

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§session_id: Vec<u8>§interactive_proof: P

Underlying interactive proof.

Implementations§

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impl<P> Nizk<P>
where P: SigmaProtocol, P::Challenge: PartialEq + PrimeField, P::Commitment: NargSerialize + NargDeserialize + Encoding, P::Response: NargSerialize + NargDeserialize + Encoding,

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pub fn new(session_identifier: &[u8], interactive_proof: P) -> Self

Constructs a new Nizk instance.

§Parameters
  • iv: Domain separation tag for the hash function (e.g., protocol name or context).
  • instance: An instance of the interactive Sigma protocol.
§Returns

A new Nizk that can generate and verify non-interactive proofs.

Source

pub fn prove_batchable( &self, witness: &P::Witness, rng: &mut impl ScalarRng, ) -> Result<Vec<u8>, Error>

Generates a batchable, serialized non-interactive proof.

§Parameters
  • witness: The secret witness.
  • rng: A cryptographically secure random number generator.
§Returns

A serialized proof suitable for batch verification.

§Panics

Panics if serialization fails (should not happen under correct implementation).

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pub fn verify_batchable(&self, narg_string: &[u8]) -> Result<(), Error>

Verifies a batchable non-interactive proof.

§Parameters
  • proof: A serialized batchable proof.
§Returns
  • Ok(()) if the proof is valid.
  • Err(Error) if deserialization or verification fails.
§Errors
  • Returns Error::VerificationFailure if:
    • The challenge doesn’t match the recomputed one from the commitment.
    • The response fails verification under the Sigma protocol.
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impl<P> Nizk<P>
where P: SigmaProtocol + SigmaProtocolSimulator, P::Challenge: PartialEq + NargDeserialize + NargSerialize + PrimeField,

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pub fn prove_compact( &self, witness: &P::Witness, rng: &mut impl ScalarRng, ) -> Result<Vec<u8>, Error>

Generates a compact serialized proof.

Uses a more space-efficient representation compared to batchable proofs.

§Parameters
  • witness: The secret witness.
  • rng: A cryptographically secure random number generator.
§Returns

A compact, serialized proof.

§Panics

Panics if serialization fails.

Source

pub fn verify_compact(&self, proof: &[u8]) -> Result<(), Error>

Verifies a compact proof.

Recomputes the commitment from the challenge and response, then verifies it.

§Parameters
  • proof: A compact serialized proof.
§Returns
  • Ok(()) if the proof is valid.
  • Err(Error) if deserialization or verification fails.
§Errors
  • Returns Error::VerificationFailure if:
    • Deserialization fails.
    • The recomputed commitment or response is invalid under the Sigma protocol.

Trait Implementations§

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impl<P> Debug for Nizk<P>
where P: SigmaProtocol + Debug, P::Challenge: PartialEq,

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<P> Freeze for Nizk<P>
where P: Freeze,

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impl<P> RefUnwindSafe for Nizk<P>
where P: RefUnwindSafe,

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impl<P> Send for Nizk<P>
where P: Send,

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impl<P> Sync for Nizk<P>
where P: Sync,

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impl<P> Unpin for Nizk<P>
where P: Unpin,

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impl<P> UnsafeUnpin for Nizk<P>
where P: UnsafeUnpin,

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impl<P> UnwindSafe for Nizk<P>
where P: UnwindSafe,

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where T: 'static + ?Sized,

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Gets the TypeId of self. Read more
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