Update universal accumulator initialization

Signed-off-by: lovesh <lovesh.bond@gmail.com>

Author: lovesh

.github/workspaces/test.yml

@@ -1,6 +1,10 @@
 name: test
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request: {}
 
 jobs:
   build_test:

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@docknetwork/crypto-wasm-ts",
-  "version": "0.7.0",
+  "version": "0.8.0",
   "description": "Typescript abstractions over Dock's Rust crypto library's WASM wrapper",
   "homepage": "https://github.com/docknetwork/crypto-wasm-ts",
   "main": "lib/crypto-wasm-ts/src/index.js",
@@ -10,7 +10,8 @@
     "clean": "rm -rf lib/",
     "prepare": "husky install",
     "pretty": "prettier --config .prettierrc 'src/**/*.ts' --write",
-    "test": "jest"
+    "test": "jest",
+    "publish": "yarn build & npm publish"
   },
   "license": "Apache-2.0",
   "private": false,
@@ -21,7 +22,7 @@
     "lib": "lib"
   },
   "dependencies": {
-    "@docknetwork/crypto-wasm": "0.6.0"
+    "@docknetwork/crypto-wasm": "0.7.0"
   },
   "devDependencies": {
     "eslint-config-prettier": "^8.3.0",

src/accumulator/accumulator.ts

@@ -37,7 +37,8 @@ import {
   generateRandomFieldElement,
   universalAccumulatorCombineMultipleD,
   generateFieldElementFromBytes,
-  generateFieldElementFromNumber
+  generateFieldElementFromNumber,
+  universalAccumulatorFixedInitialElements
 } from '@docknetwork/crypto-wasm';
 import { MembershipWitness, NonMembershipWitness } from './accumulatorWitness';
 import { getUint8ArraysFromObject } from '../util';
@@ -620,15 +621,26 @@ export class UniversalAccumulator extends Accumulator {
     initialElementsStore?: IInitialElementsStore,
     batchSize = 100
   ): Promise<UniversalAccumulator> {
-    // store a batch of generated elements and take the product once the batch is full
-    let currentBatch = [];
+    const storePresent = initialElementsStore !== undefined;
+
     // store the products of each batch
     const products: Uint8Array[] = [];
+    // The first batch of products is the elements fixed for each curve, in this case it's for BLS12-381
+    const fixed = universalAccumulatorFixedInitialElements();
+    if (storePresent) {
+      for (const i of fixed) {
+        await initialElementsStore.add(i);
+      }
+    }
+    products.push(universalAccumulatorComputeInitialFv(fixed, secretKey));
+
+    // store a batch of generated elements and take the product once the batch is full
+    let currentBatch = [];
     // Accumulate 1 more than the maximum number of allowed members as specified in the paper
     for (let i = 0; i <= maxSize; i++) {
       const e = generateRandomFieldElement();
       currentBatch.push(e);
-      if (initialElementsStore !== undefined) {
+      if (storePresent) {
         await initialElementsStore.add(e);
       }
       if (currentBatch.length == batchSize) {

tests/accumulator.spec.ts

@@ -1,4 +1,9 @@
-import { generateRandomFieldElement, IKeypair, initializeWasm } from '@docknetwork/crypto-wasm';
+import {
+  generateRandomFieldElement,
+  IKeypair,
+  initializeWasm,
+  universalAccumulatorFixedInitialElements
+} from '@docknetwork/crypto-wasm';
 import {
   IInitialElementsStore,
   Accumulator,
@@ -227,6 +232,12 @@ describe('Accumulators type', () => {
     const keypair1 = UniversalAccumulator.generateKeypair(params1);
     const store = new InMemoryInitialElementsStore();
     const accumulator1 = await UniversalAccumulator.initialize(20, params1, keypair1.secret_key, store);
+
+    const fixed = universalAccumulatorFixedInitialElements();
+    expect(store.store.size).toEqual(20 + fixed.length + 1);
+    for (const i of fixed) {
+      expect(store.store.has(i));
+    }
     const state1 = new InMemoryUniversalState();
     await runCommonTests(keypair1, params1, accumulator1, state1, store);
   });

tests/demo.spec.ts

@@ -216,13 +216,7 @@ describe('A demo showing combined use of BBS+ signatures and accumulators using
       Accum3Pk = keypair.public_key;
       const maxSize = 100;
 
-      const initialElements = [];
-      for (let i = 0; i < maxSize; i++) {
-        initialElements.push(generateRandomFieldElement());
-      }
-
-      const fV = UniversalAccumulator.initialElementsProduct(initialElements, Accum3Sk);
-      Accum3 = UniversalAccumulator.initializeGivenInitialElementsProduct(maxSize, fV, Accum3Params);
+      Accum3 = await UniversalAccumulator.initialize(maxSize, Accum3Params, Accum3Sk);
       Accum3NonMemPrk = Accumulator.generateNonMembershipProvingKey(stringToBytes('Another public label'));
       Accum3MemPrk = Accumulator.deriveMembershipKeyFromNonMembershipProvingKey(Accum3NonMemPrk);
     }