From 488b33e08a684c1b822a10eb1c1dd32b4dee943d Mon Sep 17 00:00:00 2001 From: arnaucube Date: Thu, 11 Feb 2021 23:14:28 +0100 Subject: [PATCH] Add even hex length before hashing 'm' for Go comp --- package-lock.json | 1176 +++++++++++++++++++++++++++++++++++++++++++- package.json | 6 +- src/index.ts | 10 +- test/index.test.ts | 22 +- 4 files changed, 1205 insertions(+), 9 deletions(-) diff --git a/package-lock.json b/package-lock.json index 004b681..53f789e 100644 --- a/package-lock.json +++ b/package-lock.json @@ -1,6 +1,6 @@ { "name": "blindsecp256k1", - "version": "0.0.1", + "version": "0.0.5", "lockfileVersion": 1, "requires": true, "dependencies": { @@ -150,6 +150,39 @@ "integrity": "sha512-sL/cEvJWAnClXw0wHk85/2L0G6Sj8UB0Ctc1TEMbKSsmpRosqhwj9gWgFRZSrBr2f9tiXISwNhCPmlfqUqyb9Q==", "dev": true }, + "JSONStream": { + "version": "1.3.5", + "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.5.tgz", + "integrity": 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https://github.com/arnaucube/go-blindsecp256k1", "main": "dist/index", "types": "dist/index", @@ -8,6 +8,7 @@ "prepublishOnly": "npm run build", "clean": "rimraf dist", "build": "npm run clean && ./node_modules/.bin/tsc", + "browserify": "npm run build && browserify dist/index.js --standalone blindsecp256k1 > dist/blindsecp256k1-browser.js", "watch": "./node_modules/.bin/tsc -w -p .", "ts-node": "./node_modules/.bin/ts-node", "test": "npm run build && ./node_modules/.bin/mocha -r ts-node/register test/**/*.ts" @@ -31,6 +32,7 @@ "rimraf": "^3.0.2", "ts-node": "^9.1.1", "tslint": "^6.1.3", - "typescript": "^4.1.3" + "typescript": "^4.1.3", + "browserify": "^16.5.0" } } diff --git a/src/index.ts b/src/index.ts index a9beaf8..6bcceea 100644 --- a/src/index.ts +++ b/src/index.ts @@ -93,8 +93,9 @@ export function blind(m: BigInteger, signerR: Point): { mBlinded: BigInteger, us const ainvrx = ainv.multiply(rx) const mHex = m.toString(16) - const hHex = keccak256('0x' + zeroPad(mHex, 32)).substr(2) + const hHex = keccak256('0x' + evenHex(mHex)).substr(2) const h = BigInteger.fromHex(hHex) + const mBlinded = ainvrx.multiply(h) return { mBlinded: mBlinded.mod(n), userSecretData: u } @@ -121,7 +122,7 @@ export function verify(m: BigInteger, s: UnblindedSignature, q: Point) { const sG = G.multiply(s.s) const mHex = m.toString(16) - const hHex = keccak256('0x' + zeroPad(mHex, 32)).substr(2) + const hHex = keccak256('0x' + evenHex(mHex)).substr(2) const h = BigInteger.fromHex(hHex) const rx = s.f.affineX.mod(n) @@ -148,9 +149,8 @@ function random(bytes: number) { return k } -function zeroPad(hexString: string, byteLength: number) { - if (hexString.length > (byteLength * 2)) throw new Error("Out of bounds") - while (hexString.length < (byteLength * 2)) { +export function evenHex(hexString: string) { + if ((hexString.length % 2) != 0) { hexString = "0" + hexString } return hexString diff --git a/test/index.test.ts b/test/index.test.ts index 9d53c14..a065eed 100644 --- a/test/index.test.ts +++ b/test/index.test.ts @@ -2,7 +2,7 @@ import * as assert from 'assert' import * as BigInteger from 'bigi' import { keccak256 } from '@ethersproject/keccak256' -import { pointFromHex, newKeyPair, newRequestParameters, blind, blindSign, unblind, verify, signatureFromHex, signatureToHex, messageToBigNumber, pointToHex } from '../src/index' +import { pointFromHex, newKeyPair, newRequestParameters, blind, blindSign, unblind, verify, signatureFromHex, signatureToHex, messageToBigNumber, pointToHex, ecparams, newBigFromString, evenHex } from '../src/index' describe('keccak256', function () { it('should hash strings and big numbers', async () => { @@ -71,3 +71,23 @@ describe('import point from hex', function () { assert.strictEqual(signatureToHex(signatureFromHex(originalSignatureHex)), originalSignatureHex) }) }) + +describe('Test hash m odd bytes', function () { + it('should take odd hex value and prepare it (using evenHex) to be even for keccak256 input', async () => { + // This test is made with same values than + // https://github.com/arnaucube/go-blindsecp256k1 to ensure + // compatibility + let m = newBigFromString("3024162961766929396601888431330224482373544644288322432261208139289299439809") + let mHex = m.toString(16) + assert.strictEqual(57, mHex.substr(6).length) + let hHex = keccak256('0x' + evenHex(mHex).substr(6)).substr(2) + let h = BigInteger.fromHex(hHex) + assert.strictEqual("57523339312508913023232057765773019244858443678197951618720342803494056599369", h.toString()) + + mHex = m.toString(16) + "1234" + assert.strictEqual(67, mHex.length) + hHex = keccak256('0x' + evenHex(mHex)).substr(2) + h = BigInteger.fromHex(hHex) + assert.strictEqual("9697834584560956691445940439424778243200861871421750951058436814122640359156", h.toString()) + }) +})