Add loop nodejs client test

.gitignore

@@ -1 +1,2 @@
 wasm_exec.js
+node_modules

README.md

@@ -1,18 +1,24 @@
 # blindsig-client-server-example
-Example of usage of https://github.com/arnaucube/go-blindsecp256k1, including a server representing the 'signer', and a web representing the 'user'.
+Example of usage of [go-blindsecp256k1](https://github.com/arnaucube/go-blindsecp256k1) & [blindsecp256k1-js](https://github.com/arnaucube/blindsecp256k1-js), including a server representing the 'signer', and a web representing the 'user'.
 
 ## Run
 - Needs [go](https://golang.org/) installed
-- Add the file `wasm_exec.js` in the `client` directory:
-```
-cd client
-cp "$(go env GOROOT)/misc/wasm/wasm_exec.js" .
-```
+- If wants to use the WASM web version:
+	- Add the file `wasm_exec.js` in the `client` directory:
+	```
+	cd client
+	cp "$(go env GOROOT)/misc/wasm/wasm_exec.js" .
+	```
 - Run the server:
 ```
 go run main.go
 ```
 - Open the browser at `127.0.0.1:3000/web`
+	- `/web/index.html` shows the js version
+	- `/web/index-wasm.html` shows the WASM version
+
+## Loop test
+Check [loop-test](https://github.com/arnaucube/blindsig-client-server-example/blob/master/client/loop-test/README.md) for more details.
 
 ## Flow
 ![diagram](https://raw.githubusercontent.com/arnaucube/blindsig-client-server-example/master/diagram.png "diagram")

client/loop-test/README.md

@@ -0,0 +1,8 @@
+# Loop test
+- Run the server from the repo root directory: `go run main.go`
+- Install npm dependancies `npm install`
+- Run the nodejs loop script: `node loop-test.js`
+	- This will print on the screen the number of iterations each 100 iterations
+	- And if there is an error verifying a signature, will print all the involved parameters
+
+

client/loop-test/loop-test.js

@@ -0,0 +1,87 @@
+// This version uses https://github.com/arnaucube/blindsecp256k1-js
+
+const blindsecp256k1 = require('blindsecp256k1');
+const axios = require('axios');
+
+let signerR, signerQ, m, mBlinded, userSecretData, blindedSig, sig, errCount, verified;
+
+const apiUrl = "http://127.0.0.1:3000";
+
+function printPoint(name, p) {
+	console.log(`${name}:\n	x: ${p.affineX.toString()}\n	y: ${p.affineY.toString()}`);
+}
+
+async function newRequest() {
+	try {
+		const res = await axios.get(apiUrl+'/request');
+		signerR = blindsecp256k1.Point.fromAffine(blindsecp256k1.ecparams,
+			blindsecp256k1.newBigFromString(res.data.signerR.x),
+			blindsecp256k1.newBigFromString(res.data.signerR.y));
+		signerQ = blindsecp256k1.Point.fromAffine(blindsecp256k1.ecparams,
+			blindsecp256k1.newBigFromString(res.data.signerQ.x),
+			blindsecp256k1.newBigFromString(res.data.signerQ.y));
+
+		let blindRes = blindsecp256k1.blind(m, signerR);
+		mBlinded = blindRes.mBlinded;
+		userSecretData = blindRes.userSecretData;
+	} catch (error) {
+		console.error(error);
+	}
+}
+
+async function askBlindSign() {
+	try {
+		let data = {
+			m: mBlinded.toString(),
+			r: {
+				x: signerR.affineX.toString(),
+				y: signerR.affineY.toString()
+			}
+		};
+		let res = await axios.post(apiUrl+'/blindsign', data);
+		blindedSig = blindsecp256k1.newBigFromString(res.data.sBlind);
+		sig = blindsecp256k1.unblind(
+			blindedSig,
+			userSecretData);
+	} catch (error) {
+		console.error(error);
+	}
+}
+
+async function verify() {
+	verified = blindsecp256k1.verify(m, sig, signerQ);
+	if (!verified) {
+		errCount++;
+		printPoint("signerR", signerR);
+		printPoint("signerQ", signerQ);
+		console.log("m:", m);
+		console.log("mBlinded:", mBlinded.toString());
+		console.log(`userSecretData:\n	a: ${userSecretData.a.toString()}\n	b: ${userSecretData.b.toString()}`);
+		printPoint("userSecretData.f", userSecretData.f);
+		console.log("blinded sig:", blindedSig.toString());
+		console.log("sig.s:", sig.s.toString());
+		printPoint("sig.f", sig.f);
+		console.log("verify", verified);
+	}
+}
+
+async function iteration() {
+	await newRequest()
+	await askBlindSign()
+	await verify()
+}
+
+async function main() {
+	errCount = 0;
+	for (let i=0; i<10000; i++) {
+		m = blindsecp256k1.newKeyPair().sk;
+
+		await iteration()
+		if (i%100 ==0) {
+			console.log("number of iterations", i);
+		}
+	}
+	console.log("errCount", errCount);
+}
+
+main()

client/loop-test/package-lock.json

@@ -0,0 +1,77 @@
+{
+  "name": "loop-test",
+  "version": "0.0.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@ethersproject/bytes": {
+      "version": "5.0.10",
+      "resolved": "https://registry.npmjs.org/@ethersproject/bytes/-/bytes-5.0.10.tgz",
+      "integrity": "sha512-vpu0v1LZ1j1s9kERQIMnVU69MyHEzUff7nqK9XuCU4vx+AM8n9lU2gj7jtJIvGSt9HzatK/6I6bWusI5nyuaTA==",
+      "requires": {
+        "@ethersproject/logger": "^5.0.8"
+      }
+    },
+    "@ethersproject/keccak256": {
+      "version": "5.0.7",
+      "resolved": "https://registry.npmjs.org/@ethersproject/keccak256/-/keccak256-5.0.7.tgz",
+      "integrity": "sha512-zpUBmofWvx9PGfc7IICobgFQSgNmTOGTGLUxSYqZzY/T+b4y/2o5eqf/GGmD7qnTGzKQ42YlLNo+LeDP2qe55g==",
+      "requires": {
+        "@ethersproject/bytes": "^5.0.9",
+        "js-sha3": "0.5.7"
+      }
+    },
+    "@ethersproject/logger": {
+      "version": "5.0.9",
+      "resolved": "https://registry.npmjs.org/@ethersproject/logger/-/logger-5.0.9.tgz",
+      "integrity": "sha512-kV3Uamv3XOH99Xf3kpIG3ZkS7mBNYcLDM00JSDtNgNB4BihuyxpQzIZPRIDmRi+95Z/R1Bb0X2kUNHa/kJoVrw=="
+    },
+    "axios": {
+      "version": "0.21.1",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.21.1.tgz",
+      "integrity": "sha512-dKQiRHxGD9PPRIUNIWvZhPTPpl1rf/OxTYKsqKUDjBwYylTvV7SjSHJb9ratfyzM6wCdLCOYLzs73qpg5c4iGA==",
+      "requires": {
+        "follow-redirects": "^1.10.0"
+      }
+    },
+    "bigi": {
+      "version": "1.4.2",
+      "resolved": "https://registry.npmjs.org/bigi/-/bigi-1.4.2.tgz",
+      "integrity": "sha1-nGZalfiLiwj8Bc/XMfVhhZ1yWCU="
+    },
+    "bignumber.js": {
+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-7.0.2.tgz",
+      "integrity": "sha512-TosM7Yg1Ux0ZCNwwS/tW95r3q9xIZstgsUGKWaez0Cgq8Oy3qia9RGvyG/fbxlQAvigjza1d057QNQLGvYXCeg=="
+    },
+    "blindsecp256k1": {
+      "version": "0.0.5",
+      "resolved": "https://registry.npmjs.org/blindsecp256k1/-/blindsecp256k1-0.0.5.tgz",
+      "integrity": "sha512-P+ahL3AlZY2RvtEUH7W3yidTNfDsu7yUsb2OOorEzsSE0cBovQKyBi+d883CVwbgjcW4mFFmHYgBZ0q+QOz9zQ==",
+      "requires": {
+        "@ethersproject/keccak256": "5.0.7",
+        "bigi": "^1.4.2",
+        "bignumber.js": "7.0.2",
+        "ecurve": "1.0.0"
+      }
+    },
+    "ecurve": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/ecurve/-/ecurve-1.0.0.tgz",
+      "integrity": "sha1-Ms/Vzl9CHpNRIGoz1OPP0280ZaQ=",
+      "requires": {
+        "bigi": "^1.1.0"
+      }
+    },
+    "follow-redirects": {
+      "version": "1.13.2",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.13.2.tgz",
+      "integrity": "sha512-6mPTgLxYm3r6Bkkg0vNM0HTjfGrOEtsfbhagQvbxDEsEkpNhw582upBaoRZylzen6krEmxXJgt9Ju6HiI4O7BA=="
+    },
+    "js-sha3": {
+      "version": "0.5.7",
+      "resolved": "https://registry.npmjs.org/js-sha3/-/js-sha3-0.5.7.tgz",
+      "integrity": "sha1-DU/9gALVMzqrr0oj7tL2N0yfKOc="
+    }
+  }
+}

client/loop-test/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "loop-test",
+  "version": "0.0.1",
+  "description": "",
+  "main": "loop-test.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "arnaucube",
+  "license": "ISC",
+  "dependencies": {
+    "axios": "^0.21.1",
+    "blindsecp256k1": "0.0.5"
+  }
+}