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352 lines
12 KiB
352 lines
12 KiB
#!/usr/bin/env node
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/*
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Copyright 2018 0KIMS association.
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This file is part of jaz (Zero Knowledge Circuit Compiler).
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jaz is a free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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jaz is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with jaz. If not, see <https://www.gnu.org/licenses/>.
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*/
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/* eslint-disable no-console */
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const fs = require("fs");
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const path = require("path");
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const zkSnark = require("./index.js");
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const {stringifyBigInts, unstringifyBigInts} = require("./src/stringifybigint.js");
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const version = require("./package").version;
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const argv = require("yargs")
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.version(version)
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.usage(`snarkjs <command> <options>
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setup command
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=============
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snarkjs setup <option>
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Runs a setup for a circuit generating the proving and the verification key.
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-c or --circuit <circuitFile>
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Filename of the compiled circuit file generated by circom.
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Default: circuit.json
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--pk or --provingkey <provingKeyFile>
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Output filename where the proving key will be stored.
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Default: proving_key.json
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--vk or --verificationkey <verificationKeyFile>
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Output Filename where the verification key will be stored.
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Default: verification_key.json
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calculate witness command
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=========================
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snarkjs calculatewitness <options>
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Calculate the witness of a circuit given an input.
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-c or --circuit <circuitFile>
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Filename of the compiled circuit file generated by circom.
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Default: circuit.json
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-i or --input <inputFile>
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JSON file with the inputs of the circuit.
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Default: input.json
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Example of for a circuit with tow inputs a and b:
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{"a": "22", "b": "33"}
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-w or --witness
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Output filename with the generated witness.
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Default: witness.json
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generate a proof command
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========================
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snarkjs proof <options>
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-w or --witness
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Input filename used to calculate the proof.
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Default: witness.json
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--pk or --provingkey <provingKeyFile>
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Input filename with the proving key (generated during the setup).
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Default: proving_key.json
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-p or --proof
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Output filenam with the zero knowlage proof.
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Default: proof.json
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--pub or --public <publicFilename>
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Output filename with the value of the public wires/signals.
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This info will be needed to verify the proof.
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Default: public.json
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verify command
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==============
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snarkjs verify <options>
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The command returns "OK" if the proof is valid
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and "INVALID" in case it is not a valid proof.
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--vk or --verificationkey <verificationKeyFile>
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Input Filename with the verification key (generated during the setup).
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Default: verification_key.json
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-p or --proof
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Input filenam with the zero knowlage proof you want to verify
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Default: proof.json
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--pub or --public <publicFilename>
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Input filename with the public wires/signals.
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Default: public.json
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generate solidity verifier command
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==================================
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snarkjs generateverifier <options>
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Generates a solidity smart contract that verifies the zero knowlage proof.
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--vk or --verificationkey <verificationKeyFile>
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Input Filename with the verification key (generated during the setup).
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Default: verification_key.json
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-v or --verifier
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Output file with a solidity smart contract that verifies a zero knowlage proof.
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Default: verifier.sol
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generate call parameters
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========================
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snarkjs generatecall <options>
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Outputs into the console the raw parameters to be used in 'verifyProof'
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method of the solidity verifier.
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-p or --proof
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Input filenam with the zero knowlage proof you want to use
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Default: proof.json
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--pub or --public <publicFilename>
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Input filename with the public wires/signals.
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Default: public.json
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`)
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.alias("c", "circuit")
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.alias("pk", "provingkey")
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.alias("vk", "verificationkey")
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.alias("w", "witness")
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.alias("p", "proof")
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.alias("i", "input")
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.alias("pub", "public")
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.alias("v", "verifier")
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.help("h")
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.alias("h", "help")
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.epilogue(`Copyright (C) 2018 0kims association
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This program comes with ABSOLUTELY NO WARRANTY;
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This is free software, and you are welcome to redistribute it
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under certain conditions; see the COPYING file in the official
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repo directory at https://github.com/iden3/circom `)
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.argv;
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const circuitName = (argv.circuit) ? argv.circuit : "circuit.json";
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const provingKeyName = (argv.provingkey) ? argv.provingkey : "proving_key.json";
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const verificationKeyName = (argv.verificationkey) ? argv.verificationkey : "verification_key.json";
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const inputName = (argv.input) ? argv.input : "input.json";
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const witnessName = (argv.witness) ? argv.witness : "witness.json";
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const proofName = (argv.proof) ? argv.proof : "proof.json";
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const publicName = (argv.public) ? argv.public : "public.json";
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const verifierName = (argv.public) ? argv.public : "verifier.sol";
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function p256(n) {
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let nstr = n.toString(16);
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while (nstr.length < 64) nstr = "0"+nstr;
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nstr = `"0x${nstr}"`;
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return nstr;
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}
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try {
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if (argv._[0].toUpperCase() == "SETUP") {
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const cirDef = JSON.parse(fs.readFileSync(circuitName, "utf8"));
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const cir = new zkSnark.Circuit(cirDef);
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const setup = zkSnark.setup(cir);
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fs.writeFileSync(provingKeyName, JSON.stringify(stringifyBigInts(setup.vk_proof), null, 1), "utf-8");
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fs.writeFileSync(verificationKeyName, JSON.stringify(stringifyBigInts(setup.vk_verifier), null, 1), "utf-8");
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process.exit(0);
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} else if (argv._[0].toUpperCase() == "CALCULATEWITNESS") {
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const cirDef = JSON.parse(fs.readFileSync(circuitName, "utf8"));
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const cir = new zkSnark.Circuit(cirDef);
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const input = unstringifyBigInts(JSON.parse(fs.readFileSync(inputName, "utf8")));
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const witness = cir.calculateWitness(input);
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fs.writeFileSync(witnessName, JSON.stringify(stringifyBigInts(witness), null, 1), "utf-8");
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process.exit(0);
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} else if (argv._[0].toUpperCase() == "PROOF") {
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const witness = unstringifyBigInts(JSON.parse(fs.readFileSync(witnessName, "utf8")));
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const provingKey = unstringifyBigInts(JSON.parse(fs.readFileSync(provingKeyName, "utf8")));
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const {proof, publicSignals} = zkSnark.genProof(provingKey, witness);
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fs.writeFileSync(proofName, JSON.stringify(stringifyBigInts(proof), null, 1), "utf-8");
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fs.writeFileSync(publicName, JSON.stringify(stringifyBigInts(publicSignals), null, 1), "utf-8");
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process.exit(0);
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} else if (argv._[0].toUpperCase() == "VERIFY") {
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const public = unstringifyBigInts(JSON.parse(fs.readFileSync(publicName, "utf8")));
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const verificationKey = unstringifyBigInts(JSON.parse(fs.readFileSync(verificationKeyName, "utf8")));
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const proof = unstringifyBigInts(JSON.parse(fs.readFileSync(proofName, "utf8")));
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const isValid = zkSnark.isValid(verificationKey, proof, public);
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if (isValid) {
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console.log("OK");
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process.exit(0);
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} else {
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console.log("INVALID");
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process.exit(1);
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}
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} else if (argv._[0].toUpperCase() == "GENERATEVERIFIER") {
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const verificationKey = unstringifyBigInts(JSON.parse(fs.readFileSync(verificationKeyName, "utf8")));
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let template = fs.readFileSync(path.join( __dirname, "templates", "verifier.sol"), "utf-8");
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const vka_str = `[${verificationKey.vk_a[0][1].toString()},`+
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`${verificationKey.vk_a[0][0].toString()}], `+
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`[${verificationKey.vk_a[1][1].toString()},` +
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`${verificationKey.vk_a[1][0].toString()}]`;
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template = template.replace("<%vk_a%>", vka_str);
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const vkb_str = `${verificationKey.vk_b[0].toString()},`+
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`${verificationKey.vk_b[1].toString()}`;
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template = template.replace("<%vk_b%>", vkb_str);
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const vkc_str = `[${verificationKey.vk_c[0][1].toString()},`+
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`${verificationKey.vk_c[0][0].toString()}], `+
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`[${verificationKey.vk_c[1][1].toString()},` +
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`${verificationKey.vk_c[1][0].toString()}]`;
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template = template.replace("<%vk_c%>", vkc_str);
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const vkg_str = `[${verificationKey.vk_g[0][1].toString()},`+
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`${verificationKey.vk_g[0][0].toString()}], `+
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`[${verificationKey.vk_g[1][1].toString()},` +
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`${verificationKey.vk_g[1][0].toString()}]`;
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template = template.replace("<%vk_g%>", vkg_str);
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const vkgb1_str = `${verificationKey.vk_gb_1[0].toString()},`+
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`${verificationKey.vk_gb_1[1].toString()}`;
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template = template.replace("<%vk_gb1%>", vkgb1_str);
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const vkgb2_str = `[${verificationKey.vk_gb_2[0][1].toString()},`+
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`${verificationKey.vk_gb_2[0][0].toString()}], `+
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`[${verificationKey.vk_gb_2[1][1].toString()},` +
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`${verificationKey.vk_gb_2[1][0].toString()}]`;
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template = template.replace("<%vk_gb2%>", vkgb2_str);
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const vkz_str = `[${verificationKey.vk_z[0][1].toString()},`+
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`${verificationKey.vk_z[0][0].toString()}], `+
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`[${verificationKey.vk_z[1][1].toString()},` +
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`${verificationKey.vk_z[1][0].toString()}]`;
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template = template.replace("<%vk_z%>", vkz_str);
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// The points
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template = template.replace("<%vk_input_length%>", (verificationKey.A.length-1).toString());
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template = template.replace("<%vk_ic_length%>", verificationKey.A.length.toString());
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let vi = "";
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for (let i=0; i<verificationKey.A.length; i++) {
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if (vi != "") vi = vi + " ";
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vi = vi + `vk.IC[${i}] = Pairing.G1Point(${verificationKey.A[i][0].toString()},`+
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`${verificationKey.A[i][1].toString()});\n`;
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}
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template = template.replace("<%vk_ic_pts%>", vi);
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fs.writeFileSync(verifierName, template, "utf-8");
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process.exit(0);
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} else if (argv._[0].toUpperCase() == "GENERATECALL") {
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const public = unstringifyBigInts(JSON.parse(fs.readFileSync(publicName, "utf8")));
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const proof = unstringifyBigInts(JSON.parse(fs.readFileSync(proofName, "utf8")));
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inputs = "";
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for (let i=0; i<public.length; i++) {
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if (inputs != "") inputs = inputs + ",";
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inputs = inputs + p256(public[i]);
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}
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const S=`[${p256(proof.pi_a[0])}, ${p256(proof.pi_a[1])}],` +
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`[${p256(proof.pi_ap[0])}, ${p256(proof.pi_ap[1])}],` +
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`[[${p256(proof.pi_b[0][1])}, ${p256(proof.pi_b[0][0])}],[${p256(proof.pi_b[1][1])}, ${p256(proof.pi_b[1][0])}]],` +
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`[${p256(proof.pi_bp[0])}, ${p256(proof.pi_bp[1])}],` +
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`[${p256(proof.pi_c[0])}, ${p256(proof.pi_c[1])}],` +
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`[${p256(proof.pi_cp[0])}, ${p256(proof.pi_cp[1])}],` +
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`[${p256(proof.pi_h[0])}, ${p256(proof.pi_h[1])}],` +
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`[${p256(proof.pi_kp[0])}, ${p256(proof.pi_kp[1])}],` +
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`[${inputs}]` ;
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console.log(S);
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process.exit(0);
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}
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} catch(err) {
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console.log("ERROR: " + err);
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process.exit(1);
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}
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