65 lines
2.6 KiB
JavaScript
65 lines
2.6 KiB
JavaScript
/*
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Copyright 2018 0KIMS association.
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This file is part of snarkJS.
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snarkJS 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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snarkJS 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 snarkJS. If not, see <https://www.gnu.org/licenses/>.
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*/
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import * as binFileUtils from "@iden3/binfileutils";
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import * as utils from "./powersoftau_utils.js";
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export default async function truncate(ptauFilename, template, logger) {
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const {fd: fdOld, sections} = await binFileUtils.readBinFile(ptauFilename, "ptau", 1);
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const {curve, power, ceremonyPower} = await utils.readPTauHeader(fdOld, sections);
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const sG1 = curve.G1.F.n8*2;
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const sG2 = curve.G2.F.n8*2;
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for (let p=1; p<power; p++) {
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await generateTruncate(p);
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}
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await fdOld.close();
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return true;
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async function generateTruncate(p) {
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let sP = p.toString();
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while (sP.length<2) sP = "0" + sP;
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if (logger) logger.debug("Writing Power: "+sP);
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const fdNew = await binFileUtils.createBinFile(template + sP + ".ptau", "ptau", 1, 11);
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await utils.writePTauHeader(fdNew, curve, p, ceremonyPower);
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await binFileUtils.copySection(fdOld, sections, fdNew, 2, ((2 ** p)*2-1) * sG1 ); // tagG1
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await binFileUtils.copySection(fdOld, sections, fdNew, 3, (2 ** p) * sG2); // tauG2
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await binFileUtils.copySection(fdOld, sections, fdNew, 4, (2 ** p) * sG1); // alfaTauG1
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await binFileUtils.copySection(fdOld, sections, fdNew, 5, (2 ** p) * sG1); // betaTauG1
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await binFileUtils.copySection(fdOld, sections, fdNew, 6, sG2); // betaTauG2
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await binFileUtils.copySection(fdOld, sections, fdNew, 7); // contributions
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await binFileUtils.copySection(fdOld, sections, fdNew, 12, ((2 ** (p+1))*2 -1) * sG1); // L_tauG1
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await binFileUtils.copySection(fdOld, sections, fdNew, 13, ((2 ** p)*2 -1) * sG2); // L_tauG2
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await binFileUtils.copySection(fdOld, sections, fdNew, 14, ((2 ** p)*2 -1) * sG1); // L_alfaTauG1
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await binFileUtils.copySection(fdOld, sections, fdNew, 15, ((2 ** p)*2 -1) * sG1); // L_betaTauG1
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await fdNew.close();
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}
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}
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