Want code?
Here's a Rust snippet for a basic zk-SNARK (Groth16):
``
use ark_groth16::Groth16;
use ark_bn254::Bn254;
use ark_ff::PrimeField;
use rand::thread_rng;
#[derive(Copy, Clone)]
struct CubeCircuit { x: Option<ark_bn254::Fr>, out: Option<ark_bn254::Fr> }
impl ark_relations::r1cs::ConstraintSynthesizer<ark_bn254::Fr> for CubeCircuit {
fn generate_constraints(self, cs: ark_relations::r1cs::ConstraintSystemRef<ark_bn254::Fr>) -> Result<(), ark_relations::r1cs::SynthesisError> {
let x =
cs.new_witness_variable(|| self.x.ok_or(ark_relations::r1cs::SynthesisError::AssignmentMissing))?;
let out =
cs.new_input_variable(|| self.out.ok_or(ark_relations::r1cs::SynthesisError::AssignmentMissing))?;
let x_sq =
cs.new_witness_variable(||
self.x.map(|v| v * v))?;
cs.enforce_constraint(lc!() x, lc!() x, lc!() x_sq)?;
let x_cube =
cs.new_witness_variable(||
self.x.map(|v| v * v * v))?;
cs.enforce_constraint(lc!() x_sq, lc!() x, lc!() x_cube)?;
let five = ark_bn254::Fr::from(5u32);
cs.enforce_constraint(lc!() x_cube x (five, ark_relations::r1cs::Variable::One), lc!() ark_relations::r1cs::Variable::One, lc!() out)?;
Ok(())
}
}
fn main() {
let mut rng = thread_rng();
let circuit = CubeCircuit { x: Some(ark_bn254::Fr::from(3)), out: Some(ark_bn254::Fr::from(35)) };
let (pk, vk) = Groth16::<Bn254>::setup(circuit, &mut rng).unwrap();
let proof = Groth16::<Bn254>::prove(&pk, circuit, &mut rng).unwrap();
assert!(Groth16::<Bn254>::verify(&vk, &[ark_bn254::Fr::from(35)], &proof).unwrap());
println!("Proof verified! Secret hidden. 🔒");
}
``
What's your fave ZK use case? Reply below! 🚀
#Blockchain #Web3 #RustDev"