commit 6b873054d587e8da369bea0dfd58404161e90e72 Author: arnaucube Date: Wed Feb 3 23:06:50 2021 +0100 Initial version that works Includes the needed methods to do the full flow: - newKeyPair - newRequestParameters - blind - blindSign - unblind - verify diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..3794b32 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +node_modules +blindsecp256k1-browser.js diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..f288702 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..91e3fe3 --- /dev/null +++ b/README.md @@ -0,0 +1,10 @@ +# blindsecp256k1-js [![npm](https://img.shields.io/npm/v/blindsecp256k1)](https://img.shields.io/npm/v/blindsecp256k1) + +Javascript implementation compatible with https://github.com/arnaucube/go-blindsecp256k1 + +Blind signature over [secp256k1](https://en.bitcoin.it/wiki/Secp256k1), based on *"[New Blind Signature Schemes Based on the (Elliptic Curve) Discrete Logarithm Problem](https://sci-hub.do/10.1109/ICCKE.2013.6682844)"* paper by Hamid Mala & Nafiseh Nezhadansari. + +**WARNING**: this repo is experimental, do not use in production. + +## Build for browser +By running `npm run browserify`, and the file `blindsecp256k1-browser.js` will be generated, which can be imported in the html and used as `blindsecp256k1`. diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..0ed94f5 --- /dev/null +++ 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100644 index 0000000..0a0cf42 --- /dev/null +++ b/package.json @@ -0,0 +1,22 @@ +{ + "name": "blindsecp256k1", + "version": "0.0.1", + "description": "Blind signatures over secp256k1, compatible with https://github.com/arnaucube/go-blindsecp256k1", + "main": "src/index.js", + "scripts": { + "browserify": "browserify src/index.js --standalone blindsecp256k1 > blindsecp256k1-browser.js", + "test": "mocha" + }, + "author": "arnaucube", + "license": "GPL-3.0", + "dependencies": { + "bigi": "^1.1.0", + "bignumber.js": "7.0.2", + "ecurve": "1.0.0", + "@ethersproject/keccak256": "5.0.7" + }, + "devDependencies": { + "browserify": "^16.5.0", + "mocha": "^5.2.0" + } +} diff --git a/src/index.js b/src/index.js new file mode 100644 index 0000000..4bb5209 --- /dev/null +++ b/src/index.js @@ -0,0 +1,109 @@ +var crypto = require('crypto'); +var BigInteger = require('bigi') +var ecurve = require('ecurve') +const {keccak256} = require("@ethersproject/keccak256"); + +const ecparams = ecurve.getCurveByName('secp256k1'); +const G = ecparams.G; +const n = ecparams.n; + +function newBigFromString(s) { + var a = new BigInteger() + a.fromString(s) + return a; +} + +function random(bytes){ + do { + var k = BigInteger.fromByteArrayUnsigned(crypto.randomBytes(bytes)); + } while (k.toString() == "0" && k.gcd(n).toString() != "1") + return k; +} + +function newKeyPair() { + const sk = random(32); + return {sk: sk, pk: G.multiply(sk)}; +} + +function newRequestParameters() { + const k = random(32); + return {k: k, signerR: G.multiply(k)}; +} + +/** + * Blinds the message for the signer R. + * @param {BigInteger} m + * @param {Point} signerR + * @returns {struct} {mBlinded: BigInteger, userSecretData: {a: BigInteger, b: BigInteger, f: Point}} + */ +function blind(m, signerR) { + let u = {a: BigInteger.ZERO, b: BigInteger.ZERO, f: G}; + u.a = random(32); + u.b = random(32); + + const aR = signerR.multiply(u.a); + const bG = G.multiply(u.b); + u.f = aR.add(bG); + + const rx = u.f.affineX.mod(n); + + const ainv = u.a.modInverse(n); + const ainvrx = ainv.multiply(rx); + + const mHex = m.toString(16); + const hHex = keccak256('0x' + mHex); + const h = BigInteger.fromHex(hHex.slice(2)); + const mBlinded = ainvrx.multiply(h); + + return {mBlinded: mBlinded.mod(n), userSecretData: u}; +} + +function blindSign(sk, mBlinded, k) { + let sBlind = sk.multiply(mBlinded); + sBlind = sBlind.add(k); + return sBlind.mod(n); +} + +/** + * Unblinds the blinded signature. + * @param {BigInteger} sBlind - blinded signature + * @param {a: BigInteger, b: BigInteger, f: Point} - userSecretData + * @returns {s: BigInteger, f: Point} - unblinded signature + */ +function unblind(sBlind, userSecretData) { + const s = userSecretData.a.multiply(sBlind).add(userSecretData.b); + return {s: s.mod(n), f: userSecretData.f}; +} + +function verify(m, s, q) { + const sG = G.multiply(s.s); + + const mHex = m.toString(16); + const hHex = keccak256('0x' + mHex); + const h = BigInteger.fromHex(hHex.slice(2)); + + const rx = s.f.affineX.mod(n); + const right = s.f.add( + q.multiply( + rx.multiply(h) + ) + ); + + if ((sG.affineX.toString() == right.affineX.toString()) + && (sG.affineY.toString() == right.affineY.toString())) { + return true; + } + return false; +} + + +module.exports = { + newBigFromString: newBigFromString, + ecparams: ecparams, + newKeyPair: newKeyPair, + newRequestParameters: newRequestParameters, + blind: blind, + blindSign: blindSign, + unblind: unblind, + verify: verify +} diff --git a/test/index.test.js b/test/index.test.js new file mode 100644 index 0000000..47fa926 --- /dev/null +++ b/test/index.test.js @@ -0,0 +1,39 @@ +const assert = require('assert'); +const BigInteger = require('bigi'); +var {Point} = require('ecurve') +const {keccak256} = require("@ethersproject/keccak256"); + +const {newBigFromString, ecparams, newKeyPair, newRequestParameters, blind, blindSign, unblind, verify} = require("../src/index.js"); + +describe("keccak256", function () { + it("keccak256", async () => { + const m = BigInteger.fromBuffer(Buffer.from("test", 'utf8')); + const mHex = m.toString(16); + const hHex = keccak256('0x' + mHex); + assert.equal('0x9c22ff5f21f0b81b113e63f7db6da94fedef11b2119b4088b89664fb9a3cb658', hHex); + const h = BigInteger.fromHex(hHex.slice(2)); + assert.equal('70622639689279718371527342103894932928233838121221666359043189029713682937432', h.toString()); + }); +}); + +describe("test blind", function () { + it("blind", async () => { + const {sk, pk} = newKeyPair(); + + const {k, signerR} = newRequestParameters(); + + const msg = BigInteger.fromBuffer( + Buffer.from("test", 'utf8') + ); + assert.equal('1952805748', msg.toString()); + + const {mBlinded, userSecretData} = blind(msg, signerR); + + const sBlind = blindSign(sk, mBlinded, k); + + const sig = unblind(sBlind, userSecretData); + + const verified = verify(msg, sig, pk); + assert.equal(true, verified); + }); +});