franklin_crypto::jubjub

Trait JubjubParams

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pub trait JubjubParams<E: JubjubEngine>: Sized {
    // Required methods
    fn edwards_d(&self) -> &E::Fr;
    fn montgomery_a(&self) -> &E::Fr;
    fn montgomery_2a(&self) -> &E::Fr;
    fn scale(&self) -> &E::Fr;
    fn pedersen_hash_generators(&self) -> &[Point<E, PrimeOrder>];
    fn pedersen_hash_exp_table(&self) -> &[Vec<Vec<Point<E, PrimeOrder>>>];
    fn pedersen_hash_chunks_per_generator(&self) -> usize;
    fn pedersen_circuit_generators(&self) -> &[Vec<Vec<(E::Fr, E::Fr)>>];
    fn fixed_base_chunks_per_generator(&self) -> usize;
    fn generator(&self, base: FixedGenerators) -> &Point<E, PrimeOrder>;
    fn circuit_generators(
        &self,
        base: FixedGenerators,
    ) -> &[Vec<(E::Fr, E::Fr)>];
    fn pedersen_hash_exp_window_size(&self) -> u32;
}
Expand description

The pre-computed parameters for Jubjub, including curve constants and various limits and window tables.

Required Methods§

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fn edwards_d(&self) -> &E::Fr

The d constant of the twisted Edwards curve.

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fn montgomery_a(&self) -> &E::Fr

The A constant of the birationally equivalent Montgomery curve.

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fn montgomery_2a(&self) -> &E::Fr

The A constant, doubled.

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fn scale(&self) -> &E::Fr

The scaling factor used for conversion from the Montgomery form.

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fn pedersen_hash_generators(&self) -> &[Point<E, PrimeOrder>]

Returns the generators (for each segment) used in all Pedersen commitments.

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fn pedersen_hash_exp_table(&self) -> &[Vec<Vec<Point<E, PrimeOrder>>>]

Returns the exp table for Pedersen hashes.

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fn pedersen_hash_chunks_per_generator(&self) -> usize

Returns the maximum number of chunks per segment of the Pedersen hash.

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fn pedersen_circuit_generators(&self) -> &[Vec<Vec<(E::Fr, E::Fr)>>]

Returns the pre-computed window tables [-4, 3, 2, 1, 1, 2, 3, 4] of different magnitudes of the Pedersen hash segment generators.

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fn fixed_base_chunks_per_generator(&self) -> usize

Returns the number of chunks needed to represent a full scalar during fixed-base exponentiation.

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fn generator(&self, base: FixedGenerators) -> &Point<E, PrimeOrder>

Returns a fixed generator.

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fn circuit_generators(&self, base: FixedGenerators) -> &[Vec<(E::Fr, E::Fr)>]

Returns a window table [0, 1, …, 8] for different magnitudes of some fixed generator.

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fn pedersen_hash_exp_window_size(&self) -> u32

Returns the window size for exponentiation of Pedersen hash generators outside the circuit

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors§