snarkjs/src/plonk_exportsoliditycalldata.js

zkSNARKs implementation in JavaScript

/*
    Copyright 2021 0KIMS association.

    This file is part of snarkJS.

    snarkJS is a free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    snarkJS is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
    License for more details.

    You should have received a copy of the GNU General Public License
    along with snarkJS. If not, see <https://www.gnu.org/licenses/>.
*/

import { getCurveFromName } from "./curves.js";
import {  utils }   from "ffjavascript";
const { unstringifyBigInts} = utils;

function i2hex(i) {
    return ("0" + i.toString(16)).slice(-2);
}

function p256(n) {
    let nstr = n.toString(16);
    while (nstr.length < 64) nstr = "0"+nstr;
    nstr = `"0x${nstr}"`;
    return nstr;
}

export default async function plonkExportSolidityCallData(_proof, _pub) {
    const proof = unstringifyBigInts(_proof);
    const pub = unstringifyBigInts(_pub);

    const curve = await getCurveFromName(proof.curve);
    const G1 = curve.G1;
    const Fr = curve.Fr;

    let inputs = "";
    for (let i=0; i<pub.length; i++) {
        if (inputs != "") inputs = inputs + ",";
        inputs = inputs + p256(pub[i]);
    }

    return `[${p256(proof.A[0])}, ${p256(proof.A[1])},` +
    `${p256(proof.B[0])},${p256(proof.B[1])},` +
    `${p256(proof.C[0])},${p256(proof.C[1])},` +
    `${p256(proof.Z[0])},${p256(proof.Z[1])},` +
    `${p256(proof.T1[0])},${p256(proof.T1[1])},` +
    `${p256(proof.T2[0])},${p256(proof.T2[1])},` +
    `${p256(proof.T3[0])},${p256(proof.T3[1])},` +
    `${p256(proof.Wxi[0])},${p256(proof.Wxi[1])},` +
    `${p256(proof.Wxiw[0])},${p256(proof.Wxiw[1])},` +
    `${p256(proof.eval_a)},` + 
    `${p256(proof.eval_b)},` + 
    `${p256(proof.eval_c)},` + 
    `${p256(proof.eval_s1)},` + 
    `${p256(proof.eval_s2)},` + 
    `${p256(proof.eval_zw)}]` + 
    `[${inputs}]`;
}