// This version uses https://github.com/arnaucube/blindsecp256k1-js
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const blindsecp256k1 = require('blindsecp256k1');
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const axios = require('axios');
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let signerR, signerQ, m, mBlinded, userSecretData, blindedSig, sig, errCount, verified;
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const apiUrl = "http://127.0.0.1:3000";
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function printPoint(name, p) {
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console.log(`${name}:\n x: ${p.affineX.toString()}\n y: ${p.affineY.toString()}`);
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}
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async function newRequest() {
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try {
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const res = await axios.get(apiUrl+'/request');
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signerR = blindsecp256k1.Point.fromAffine(blindsecp256k1.ecparams,
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blindsecp256k1.newBigFromString(res.data.signerR.x),
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blindsecp256k1.newBigFromString(res.data.signerR.y));
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signerQ = blindsecp256k1.Point.fromAffine(blindsecp256k1.ecparams,
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blindsecp256k1.newBigFromString(res.data.signerQ.x),
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blindsecp256k1.newBigFromString(res.data.signerQ.y));
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let blindRes = blindsecp256k1.blind(m, signerR);
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mBlinded = blindRes.mBlinded;
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userSecretData = blindRes.userSecretData;
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} catch (error) {
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console.error(error);
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}
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}
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async function askBlindSign() {
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try {
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let data = {
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m: mBlinded.toString(),
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r: {
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x: signerR.affineX.toString(),
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y: signerR.affineY.toString()
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}
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};
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let res = await axios.post(apiUrl+'/blindsign', data);
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blindedSig = blindsecp256k1.newBigFromString(res.data.sBlind);
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sig = blindsecp256k1.unblind(
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blindedSig,
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userSecretData);
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} catch (error) {
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console.error(error);
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}
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}
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async function verify() {
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verified = blindsecp256k1.verify(m, sig, signerQ);
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if (!verified) {
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errCount++;
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printPoint("signerR", signerR);
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printPoint("signerQ", signerQ);
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console.log("m:", m);
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console.log("mBlinded:", mBlinded.toString());
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console.log(`userSecretData:\n a: ${userSecretData.a.toString()}\n b: ${userSecretData.b.toString()}`);
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printPoint("userSecretData.f", userSecretData.f);
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console.log("blinded sig:", blindedSig.toString());
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console.log("sig.s:", sig.s.toString());
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printPoint("sig.f", sig.f);
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console.log("verify", verified);
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}
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}
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async function iteration() {
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await newRequest()
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await askBlindSign()
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await verify()
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}
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async function main() {
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errCount = 0;
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for (let i=0; i<10000; i++) {
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m = blindsecp256k1.newKeyPair().sk;
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await iteration()
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if (i%100 ==0) {
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console.log("number of iterations", i);
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}
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}
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console.log("errCount", errCount);
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}
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main()
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