sigma_rs::fiat_shamir

Struct NISigmaProtocol

Source 
pub struct NISigmaProtocol<P, C>
where
    P: SigmaProtocol,
    P::Challenge: PartialEq,
    C: Codec<Challenge = P::Challenge>,
{
    pub hash_state: C,
    pub interactive_proof: P,
}
Expand description

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

NISigmaProtocol 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.

Fields§

§hash_state: C

Current codec state.

§interactive_proof: P

Underlying interactive proof.

Implementations§

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impl<P, C> NISigmaProtocol<P, C>
where P: SigmaProtocol, P::Challenge: PartialEq, C: Codec<Challenge = P::Challenge> + Clone,

Source

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

Constructs a new NISigmaProtocol 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 NISigmaProtocol that can generate and verify non-interactive proofs.

Source

pub fn from_iv(iv: [u8; 32], interactive_proof: P) -> Self

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pub fn prove_batchable( &self, witness: &P::Witness, rng: &mut (impl RngCore + CryptoRng), ) -> 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).

Source

pub fn verify_batchable(&self, proof: &[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, C> NISigmaProtocol<P, C>
where P: SigmaProtocol + SigmaProtocolSimulator, P::Challenge: PartialEq, C: Codec<Challenge = P::Challenge> + Clone,

Source

pub fn prove_compact( &self, witness: &P::Witness, rng: &mut (impl RngCore + CryptoRng), ) -> 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§

Source§

impl<P, C> Debug for NISigmaProtocol<P, C>
where P: SigmaProtocol + Debug, P::Challenge: PartialEq, C: Codec<Challenge = P::Challenge> + Debug,

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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, C> Freeze for NISigmaProtocol<P, C>
where C: Freeze, P: Freeze,

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impl<P, C> RefUnwindSafe for NISigmaProtocol<P, C>
where C: RefUnwindSafe, P: RefUnwindSafe,

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impl<P, C> Send for NISigmaProtocol<P, C>
where C: Send, P: Send,

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impl<P, C> Sync for NISigmaProtocol<P, C>
where C: Sync, P: Sync,

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impl<P, C> Unpin for NISigmaProtocol<P, C>
where C: Unpin, P: Unpin,

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impl<P, C> UnwindSafe for NISigmaProtocol<P, C>
where C: UnwindSafe, P: UnwindSafe,

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