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Also add an example for creating a circuit.
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| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
| // | ||
| // Copyright (c) DUSK NETWORK. All rights reserved. | ||
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| use dusk_plonk::prelude::*; | ||
| use rand_core::OsRng; | ||
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| // Create a `TestCircuit` struct. | ||
| #[derive(Debug, Default)] | ||
| pub struct TestCircuit { | ||
| pub a: BlsScalar, | ||
| pub b: BlsScalar, | ||
| pub c: BlsScalar, | ||
| pub d: BlsScalar, | ||
| pub e: JubJubScalar, | ||
| pub f: JubJubAffine, | ||
| } | ||
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| // Implement the 'Circuit' trait that checks: | ||
| // 1) a < 2^6 | ||
| // 2) b < 2^4 | ||
| // 3) a + b + 42 = c where c is public input | ||
| // 4) a * b + d = 42 | ||
| // 5) JubJub::GENERATOR * e(JubJubScalar) = f where F is a Public Input | ||
| impl Circuit for TestCircuit { | ||
| fn circuit(&self, composer: &mut Composer) -> Result<(), Error> { | ||
| let a = composer.append_witness(self.a); | ||
| let b = composer.append_witness(self.b); | ||
| let d = composer.append_witness(self.d); | ||
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| // 1) a < 2^6 | ||
| composer.component_range::<3>(a); // 3 BIT_PAIRS = 6 bits | ||
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| // 2) b < 2^4 | ||
| composer.component_range::<2>(b); // 2 BIT_PAIRS = 4 bits | ||
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| // 3) a + b + 42 = c where c is public input | ||
| let constraint = Constraint::new() | ||
| .left(1) | ||
| .right(1) | ||
| .a(a) | ||
| .b(b) | ||
| .constant(BlsScalar::from(42)); | ||
| let result = composer.gate_add(constraint); | ||
| let c = composer.append_public(self.c); | ||
| composer.assert_equal(result, c); | ||
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| // 4) a * b + d = 42 | ||
| let constraint = Constraint::new().mult(1).a(a).b(b).fourth(1).d(d); | ||
| let result = composer.gate_mul(constraint); | ||
| composer.assert_equal_constant(result, BlsScalar::from(42), None); | ||
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| // 5) JubJub::GENERATOR * e(JubJubScalar) = f where F is a Public Input | ||
| let e = composer.append_witness(self.e); | ||
| let scalar_mul_result = composer | ||
| .component_mul_generator(e, dusk_jubjub::GENERATOR_EXTENDED)?; | ||
| composer.assert_equal_public_point(scalar_mul_result, self.f); | ||
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| Ok(()) | ||
| } | ||
| } | ||
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| fn main() { | ||
| let label = b"transcript-arguments"; | ||
| let pp = | ||
| PublicParameters::setup(1 << 12, &mut OsRng).expect("failed to setup"); | ||
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| // Compile the default circuit to generate prover and verifier | ||
| let (prover, verifier) = Compiler::compile::<TestCircuit>(&pp, label) | ||
| .expect("failed to compile circuit"); | ||
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| // Create the circuit and public inputs to prove | ||
| let a = BlsScalar::from(31); | ||
| let b = BlsScalar::zero(); | ||
| let c = BlsScalar::from(73); | ||
| let d = BlsScalar::from(42); | ||
| let e = JubJubScalar::one(); | ||
| let f: JubJubAffine = dusk_jubjub::GENERATOR_EXTENDED.into(); | ||
| let circuit = TestCircuit { a, b, c, d, e, f }; | ||
| let public_inputs = vec![c, f.get_u(), f.get_v()]; | ||
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| // Generate the proof and its public inputs | ||
| let (proof, pi) = | ||
| prover.prove(&mut OsRng, &circuit).expect("failed to prove"); | ||
| assert_eq!(public_inputs, pi); | ||
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| // Verify the generated proof | ||
| verifier | ||
| .verify(&proof, &public_inputs) | ||
| .expect("failed to verify proof"); | ||
| } |
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