77 lines
1.7 KiB
JavaScript
77 lines
1.7 KiB
JavaScript
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const {unstringifyBigInts} = require("./stringifybigint.js");
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const fs = require("fs");
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const assert = require("assert");
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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(`node buildpkey.js -i "witness.json" -o "witness.bin"
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Default: circuit.json
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`)
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.alias("i", "input")
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.alias("o", "output")
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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 inputName = (argv.input) ? argv.input : "witness.json";
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const outputName = (argv.output) ? argv.output : "witness.bin";
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const witness = unstringifyBigInts(JSON.parse(fs.readFileSync(inputName, "utf8")));
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function writeUint32(h, val) {
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h.dataView.setUint32(h.offset, val, true);
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h.offset += 4;
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}
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function writeBigInt(h, bi) {
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for (let i=0; i<8; i++) {
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const v = bi.shiftRight(i*32).and(0xFFFFFFFF).toJSNumber();
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writeUint32(h, v);
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}
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}
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function calculateBuffLen(witness) {
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let size = 0;
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// beta2, delta2
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size += witness.length * 32;
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return size;
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}
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const buffLen = calculateBuffLen(witness);
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const buff = new ArrayBuffer(buffLen);
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const h = {
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dataView: new DataView(buff),
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offset: 0
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};
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// writeUint32(h, witness.length);
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for (let i=0; i<witness.length; i++) {
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writeBigInt(h, witness[i]);
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}
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assert.equal(h.offset, buffLen);
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var wstream = fs.createWriteStream(outputName);
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wstream.write(Buffer.from(buff));
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wstream.end();
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