Type Alias UInt8

pub type UInt8<F> = UInt<8, u8, F>;

Aliased Type

struct UInt8<F> { /* private fields */ }

Implementations

impl<F: Field> UInt8<F>

pub fn new_input_vec( cs: impl Into<Namespace<F>>, values: &[u8], ) -> Result<Vec<Self>, SynthesisError>

where F: PrimeField,

Allocates a slice of u8’s as public inputs by first packing them into elements of F, (thus reducing the number of input allocations), allocating these elements as public inputs, and then converting these field variables FpVar<F> variables back into bytes.

From a user perspective, this trade-off adds constraints, but improves verifier time and verification key size.

// We'll use the BLS12-381 scalar field for our constraints.
use ark_test_curves::bls12_381::Fr;
use ark_relations::r1cs::*;
use ark_r1cs_std::prelude::*;

let cs = ConstraintSystem::<Fr>::new_ref();
let two = UInt8::new_witness(cs.clone(), || Ok(2))?;
let var = vec![two.clone(); 32];

let c = UInt8::new_input_vec(cs.clone(), &[2; 32])?;
var.enforce_equal(&c)?;
assert!(cs.is_satisfied().unwrap());