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main.cpp
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//
// main.cpp
// libsnark-example
//
// Created by su on 2018/10/27.
// Copyright © 2018 su. All rights reserved.
//
#define CURVE_MNT6
#include <istream>
#include <libsnark/common/default_types/r1cs_ppzksnark_pp.hpp>
#include <libsnark/zk_proof_systems/ppzksnark/r1cs_ppzksnark/r1cs_ppzksnark.hpp>
#include <libsnark/gadgetlib1/pb_variable.hpp>
#include <libsnark/gadgetlib1/gadgets/hashes/sha256/sha256_gadget.hpp>
#include <libsnark/gadgetlib1/gadgets/merkle_tree/merkle_tree_check_read_gadget.hpp>
using namespace libsnark;
typedef libff::Fr<default_r1cs_ppzksnark_pp> FieldT;
void test_simple() {
protoboard<FieldT> pb;
pb_variable<FieldT> x;
x.allocate(pb, "x");
pb_variable<FieldT> sym_1;
sym_1.allocate(pb, "sym_1");
pb_variable<FieldT> y;
y.allocate(pb, "y");
pb_variable<FieldT> sym_2;
sym_2.allocate(pb, "sym_2");
pb_variable<FieldT> out;
out.allocate(pb, "out");
pb.set_input_sizes(1);
pb.add_r1cs_constraint(r1cs_constraint<FieldT>(x, x, sym_1), "sym_1");
pb.add_r1cs_constraint(r1cs_constraint<FieldT>(sym_1, x, y), "y");
pb.add_r1cs_constraint(r1cs_constraint<FieldT>(y + x, 1, sym_2), "sym_2");
pb.add_r1cs_constraint(r1cs_constraint<FieldT>(sym_2 + 5, 1, out), "out");
pb.val(x) = 3;
pb.val(out) = 35;
pb.val(sym_1) = 9;
pb.val(y) = 27;
pb.val(sym_2) = 30;
const auto constraint_system = pb.get_constraint_system();
// Create keypair
auto keypair = r1cs_ppzksnark_generator<default_r1cs_ppzksnark_pp>(constraint_system);
// Create proof
const auto proof = r1cs_ppzksnark_prover<default_r1cs_ppzksnark_pp>(keypair.pk, pb.primary_input(), pb.auxiliary_input());
// Verify proof
bool verified = r1cs_ppzksnark_verifier_strong_IC<default_r1cs_ppzksnark_pp>(keypair.vk, pb.primary_input(), proof);
std::cout << "Number of R1cs constraints: " << constraint_system.num_constraints() << std::endl;
std::cout << "Verification status: " << verified << std::endl;
}
void test_one_input() {
protoboard<FieldT> pb;
block_variable<FieldT> input(pb, SHA256_block_size, "input");
digest_variable<FieldT> output(pb, SHA256_digest_size, "output");
sha256_two_to_one_hash_gadget<FieldT> sha256_gadget(pb, SHA256_block_size, input, output, "hash_gadget");
sha256_gadget.generate_r1cs_constraints();
const libff::bit_vector hash_bv = libff::int_list_to_bits({0xc082e440, 0x671cd799, 0x8baf04c0, 0x22c07e03, 0x4b125ee7, 0xd28e0a59, 0x49e4b924, 0x5f5cf897}, 32);
output.generate_r1cs_witness(hash_bv);
//string 'hello world' 512 bytes.
const libff::bit_vector input_bv = libff::int_list_to_bits({0x6c6c6568, 0x6f77206f, 0x00646c72, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000}, 32);
input.generate_r1cs_witness(input_bv);
sha256_gadget.generate_r1cs_witness();
const auto constraint_system = pb.get_constraint_system();
// Create keypair
auto keypair = r1cs_ppzksnark_generator<default_r1cs_ppzksnark_pp>(constraint_system);
// Create proof
const auto proof = r1cs_ppzksnark_prover<default_r1cs_ppzksnark_pp>(keypair.pk, pb.primary_input(), pb.auxiliary_input());
// Verify proof
bool verified = r1cs_ppzksnark_verifier_strong_IC<default_r1cs_ppzksnark_pp>(keypair.vk, pb.primary_input(), proof);
std::cout << "Number of R1cs constraints: " << constraint_system.num_constraints() << std::endl;
std::cout << "Verification status: " << verified << std::endl;
}
void test_two_input() {
protoboard<FieldT> pb;
digest_variable<FieldT> left(pb, SHA256_digest_size, "left");
digest_variable<FieldT> right(pb, SHA256_digest_size, "right");
digest_variable<FieldT> output(pb, SHA256_digest_size, "output");
sha256_two_to_one_hash_gadget<FieldT> f(pb, left, right, output, "f");
f.generate_r1cs_constraints();
std::cout << "Number of constraints for sha256_two_to_one_hash_gadget:" << pb.num_constraints() << std::endl;
const libff::bit_vector left_bv = libff::int_list_to_bits({0x426bc2d8, 0x4dc86782, 0x81e8957a, 0x409ec148, 0xe6cffbe8, 0xafe6ba4f, 0x9c6f1978, 0xdd7af7e9}, 32);
const libff::bit_vector right_bv = libff::int_list_to_bits({0x038cce42, 0xabd366b8, 0x3ede7e00, 0x9130de53, 0x72cdf73d, 0xee825114, 0x8cb48d1b, 0x9af68ad0}, 32);
const libff::bit_vector hash_bv = libff::int_list_to_bits({0xeffd0b7f, 0x1ccba116, 0x2ee816f7, 0x31c62b48, 0x59305141, 0x990e5c0a, 0xce40d33d, 0x0b1167d1}, 32);
left.generate_r1cs_witness(left_bv);
right.generate_r1cs_witness(right_bv);
f.generate_r1cs_witness();
output.generate_r1cs_witness(hash_bv);
const auto constraint_system = pb.get_constraint_system();
// Create keypair
auto keypair = r1cs_ppzksnark_generator<default_r1cs_ppzksnark_pp>(constraint_system);
// Create proof
const auto proof = r1cs_ppzksnark_prover<default_r1cs_ppzksnark_pp>(keypair.pk, pb.primary_input(), pb.auxiliary_input());
// Verify proof
bool verified = r1cs_ppzksnark_verifier_strong_IC<default_r1cs_ppzksnark_pp>(keypair.vk, pb.primary_input(), proof);
std::cout << "Number of R1cs constraints: " << constraint_system.num_constraints() << std::endl;
std::cout << "Verification status: " << verified << std::endl;
}
int main () {
std::cout << "begin snark test." << std::endl;
default_r1cs_ppzksnark_pp::init_public_params();
test_simple();
test_one_input();
test_two_input();
std::cout << "end snark test." << std::endl;
return 0;
}