Initial blinding work.

package.json

@@ -4,10 +4,15 @@
   "description": "Browser-compatible client for Secure Polling System.",
   "main": "index.js",
   "scripts": {
-    "test": "node test.js"
+    "test": "mocha"
   },
   "author": "Karissa McKelvey <[email protected]>",
   "license": "GPL",
   "dependencies": {
+    "bn.js": "^4.11.8"
+  },
+  "devDependencies": {
+    "chai": "^4.1.2",
+    "mocha": "^5.1.1"
   }
 }

test.js

@@ -0,0 +1,16 @@
+const assert = require('chai').assert,
+  {User, blindKey} = require('./user');
+
+describe('User', function() {
+  beforeEach(function() {
+    this.user = new User();
+  });
+
+  it("generates keys", function() {
+    this.user.generateKeypair();
+  });
+
+  it('blindKey', function() {
+  });
+})
+

user.js

@@ -0,0 +1,54 @@
+const { createECDH } = require('crypto'),
+  secp256k1 = 'secp256k1';
+
+class User {
+  // I think ECDH and ECDSA keys are generally interchangable.
+  generateKeypair() {
+    this.ecdh = createECDH('secp256k1');
+    this.keys = this.ecdh.generateKeys();
+  }
+  sendBlindedKey() {
+    // copy the go implementation here:
+    // https://github.com/securepollingsystem/registrar/blob/c2a8102fc07cdc4f0ea3ae442707d50b3de6fb8f/voter/voter.go#L37
+    // 
+    // the bulk of this will be copying the blinding stuff from here:
+    // https://github.com/securepollingsystem/registrar/blob/c2a8102fc07cdc4f0ea3ae442707d50b3de6fb8f/blind/requester.go#L25
+  }
+  getSignature() {
+  }
+}
+
+function blindKey(pubKey) {
+}
+
+function newRequest(Q, R, m) {
+  // https://github.com/securepollingsystem/registrar/blob/c2a8102fc07cdc4f0ea3ae442707d50b3de6fb8f/blind/requester.go#L25
+  let a, b, bInv, c;
+}
+
+function randFieldElement() {
+  // https://github.com/securepollingsystem/registrar/blob/c2a8102fc07cdc4f0ea3ae442707d50b3de6fb8f/blind/random.go#L13
+}
+
+const BN = require('bn.js');
+
+// https://github.com/securepollingsystem/registrar/blob/c2a8102fc07cdc4f0ea3ae442707d50b3de6fb8f/blind/secp256k1.go#L33
+const Secp256kParams = {
+	p: new BN('FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFE FFFFFC2F', 16),
+	a: new BN('00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000', 16),
+	b: new BN('00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000007', 16),
+	// this is the compressed form of G... What does that mean?
+	G: new BN('02 79BE667E F9DCBBAC 55A06295 CE870B07 029BFCDB 2DCE28D9 59F2815B 16F81798', 16),
+	n: new BN('FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFE BAAEDCE6 AF48A03B BFD25E8C D0364141', 16),
+	h: new BN('01', 16),
+/*
+		P:       curve.P,
+		N:       curve.N,
+		B:       curve.B,
+		Gx:      curve.Gx,
+		Gy:      curve.Gy,
+		BitSize: curve.BitSize,
+*/
+}
+
+Object.assign(module.exports, {User, blindKey});