Merge pull request #31 from ChainSafe/blst

Add BLST 🚀
2020-11-29 09:01:17 -07:00 · 2020-11-29 09:01:17 -07:00 · 804ed42354
parent 7ace4c55cc a379898589
commit 804ed42354
55 changed files with 1964 additions and 1102 deletions
--- a/.eslintrc.js
+++ b/.eslintrc.js
@ -55,7 +55,7 @@ module.exports = {
    "import/no-extraneous-dependencies": ["error", {
      "devDependencies": false,
      "optionalDependencies": false,
-      "peerDependencies": false
+      "peerDependencies": true
    }],
    "func-call-spacing": "off",
    "max-len": ["error", {
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@ -1,18 +1,32 @@
-name: CI Tests
+name: Main

 on: [pull_request, push]

 jobs:
-  lint:
-    name: Quick tests
+  tests:
+    name: Tests
    runs-on: ubuntu-latest
    steps:
-    - uses: actions/checkout@v1
-    - name: Bootstrap
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: "12.x"
+          registry-url: "https://registry.npmjs.org"
+      - name: Install deps
        run: yarn
      - name: Check types
        run: yarn check-types
      - name: Lint
        run: yarn lint
-    - name: Tests
-      run: yarn test
+      - name: Test build
+        run: yarn build
+
+      - name: Unit tests
+        run: yarn test:unit
+      - name: Spec tests
+        run: yarn test:spec
+      - name: Web tests
+        run: yarn test:web
+
+      - name: Benchmark
+        run: yarn benchmark
--- a/.prettierignore
+++ b/.prettierignore
@ -0,0 +1 @@
+.eslintrc.js
--- a/README.md
+++ b/README.md
@ -6,22 +6,90 @@
 ![ES Version](https://img.shields.io/badge/ES-2017-yellow)
 ![Node Version](https://img.shields.io/badge/node-12.x-green)

-This is a Javascript library that implements BLS (Boneh-Lynn-Shacham) signatures and supports signature aggregation.
+Javascript library for BLS (Boneh-Lynn-Shacham) signatures and signature aggregation.
+
+## Usage
+
+```bash
+yarn add @chainsafe/bls
+```
+
+To use native bindings you must install peer dependency `@chainsafe/blst`
+
+```bash
+yarn add @chainsafe/bls @chainsafe/blst
+```
+
+You must initialize the library once in your application before using it. The result is cached and use across all your imports
+
+```ts
+import bls, {init} from "@chainsafe/bls";
+
+(async () => {
+  await init("herumi");
+
+  const secretKey = bls.PrivateKey.fromKeygen();
+  const publicKey = secretKey.toPublicKey();
+  const message = new Uint8Array(32);
+
+  const signature = secretKey.sign(message);
+  console.log("Is valid: ", signature.verify(publicKey, message));
+})();
+```
+
+### Browser
+
+If you are in the browser, import from `/browser` to import directly the WASM version
+
+```ts
+import bls from "@chainsafe/bls/browser";
+```
+
+### Native bindings only
+
+If you are in NodeJS, import from `/node` to skip browser specific code. Also install peer dependency `@chainsafe/blst` which has the native bindings
+
+```bash
+yarn add @chainsafe/bls @chainsafe/blst
+```
+
+```ts
+import bls from "@chainsafe/bls/node";
+```
+
+### Native bindings + WASM fallback
+
+If you want to offer a fallback in NodeJS, first try to load native bindings and then fallback to WASM. Also install peer dependency `@chainsafe/blst` which has the native bindings
+
+```bash
+yarn add @chainsafe/bls @chainsafe/blst
+```
+
+```ts
+import bls from "@chainsafe/bls";
+
+try {
+  await bls.init("blst-native");
+} catch (e) {
+  await bls.init("herumi");
+  console.warn("Using WASM");
+}
+```
+
+The API is identical for all implementations.
+
+## Spec versioning

 | Version | Bls spec version |
 | ------- | :--------------: |
-| 0.3.x   | initial version  |
-| 1.x.x   |     draft #6     |
 | 2.x.x   |     draft #7     |
+| 1.x.x   |     draft #6     |
+| 0.3.x   | initial version  |

 > [spec](https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/specs/phase0/beacon-chain.md#bls-signatures)

 > [test vectors](https://github.com/ethereum/eth2.0-spec-tests/tree/master/tests/bls)

-## Usage
-
- `yarn add @chainsafe/bls`
-
 ## License

 Apache-2.0
--- a/blst-native.d.ts
+++ b/blst-native.d.ts
@ -0,0 +1 @@
+export * from "./lib/blst";
--- a/blst-native.js
+++ b/blst-native.js
@ -0,0 +1 @@
+module.exports = require("./lib/blst");
--- a/browser.d.ts
+++ b/browser.d.ts
@ -0,0 +1 @@
+export * from "./lib/herumi";
--- a/browser.js
+++ b/browser.js
@ -0,0 +1 @@
+export * from "./lib/herumi";
--- a/herumi.d.ts
+++ b/herumi.d.ts
@ -0,0 +1 @@
+export * from "./lib/herumi";
--- a/herumi.js
+++ b/herumi.js
@ -0,0 +1 @@
+module.exports = require("./lib/herumi");
--- a/karma.conf.js
+++ b/karma.conf.js
@ -6,7 +6,7 @@ module.exports = function(config) {

        basePath: "",
        frameworks: ["mocha", "chai"],
-        files: ["test/unit/*.ts"],
+        files: ["test/unit/run-web-implementation.test.ts"],
        exclude: [],
        preprocessors: {
            "test/**/*.ts": ["webpack"]
--- a/node.d.ts
+++ b/node.d.ts
@ -0,0 +1 @@
+export * from "./lib/blst";
--- a/node.js
+++ b/node.js
@ -0,0 +1 @@
+module.exports = require("./lib/blst");
--- a/package.json
+++ b/package.json
@ -4,13 +4,19 @@
  "description": "Implementation of bls signature verification for ethereum 2.0",
  "main": "lib/index.js",
  "types": "lib/index.d.ts",
+  "module": "./browser",
+  "browser": "./browser",
  "homepage": "https://github.com/chainsafe/bls",
  "author": "ChainSafe Systems",
  "license": "Apache-2.0",
  "files": [
    "lib/**/*.js",
    "lib/**/*.js.map",
-    "lib/**/*.d.ts"
+    "lib/**/*.d.ts",
+    "blst-native.*",
+    "browser.*",
+    "herumi.*",
+    "node."
  ],
  "keywords": [
    "ethereum",
@ -30,18 +36,18 @@
    "lint:fix": "yarn run lint --fix",
    "pretest": "yarn check-types",
    "prepublishOnly": "yarn build",
-    "test:web:unit": "karma start",
-    "test:node:unit": "nyc --cache-dir .nyc_output/.cache -r lcov -e .ts mocha --colors -r ts-node/register 'test/unit/**/*.test.ts' && nyc report",
-    "test:unit": "yarn run test:node:unit && yarn run test:web:unit",
+    "test:web": "karma start",
+    "test:unit": "mocha --colors -r ts-node/register 'test/unit/**/*.test.ts'",
+    "test:coverage": "nyc --cache-dir .nyc_output/.cache -r lcov -e .ts mocha --colors -r ts-node/register 'test/unit/**/*.test.ts' && nyc report",
    "test:spec": "mocha --colors -r ts-node/register 'test/spec/**/*.test.ts'",
    "test": "yarn run test:unit && yarn run test:spec",
    "coverage": "codecov -F bls",
-    "benchmark": "node -r ./.babel-register test/benchmarks"
+    "benchmark": "ts-node test/benchmark"
  },
  "dependencies": {
-    "@chainsafe/bls-keygen": "^0.2.0",
-    "@chainsafe/eth2-bls-wasm": "^0.5.0",
-    "assert": "^1.4.1"
+    "@chainsafe/bls-keygen": "^0.3.0",
+    "bls-eth-wasm": "^0.4.4",
+    "randombytes": "^2.1.0"
  },
  "devDependencies": {
    "@babel/cli": "^7.8.4",
@ -52,11 +58,12 @@
    "@babel/preset-env": "^7.8.4",
    "@babel/preset-typescript": "^7.8.3",
    "@babel/register": "^7.8.3",
-    "@chainsafe/as-sha256": "0.2.0",
+    "@chainsafe/blst": "^0.1.3",
    "@chainsafe/eth2-spec-tests": "0.12.0",
-    "@chainsafe/lodestar-spec-test-util": "^0.5.0",
+    "@chainsafe/lodestar-spec-test-util": "^0.11.0",
    "@types/chai": "^4.2.9",
-    "@types/mocha": "^7.0.1",
+    "@types/mocha": "^8.0.4",
+    "@types/randombytes": "^2.0.0",
    "@typescript-eslint/eslint-plugin": "^2.20.0",
    "@typescript-eslint/parser": "^2.20.0",
    "chai": "^4.2.0",
@ -70,7 +77,7 @@
    "karma-mocha": "^1.3.0",
    "karma-spec-reporter": "^0.0.32",
    "karma-webpack": "^4.0.2",
-    "mocha": "^6.2.0",
+    "mocha": "^8.2.1",
    "nyc": "^15.0.0",
    "prettier": "^2.1.2",
    "ts-loader": "^6.2.1",
@ -78,5 +85,12 @@
    "typescript": "^3.7.5",
    "webpack": "^4.30.0",
    "webpack-cli": "^3.3.2"
+  },
+  "resolutions": {
+    "mocha": "^8.2.1",
+    "v8-profiler-next": "1.3.0"
+  },
+  "peerDependencies": {
+    "@chainsafe/blst": "^0.1.3"
  }
 }
--- a/src/blst/index.ts
+++ b/src/blst/index.ts
@ -0,0 +1,27 @@
+import {PrivateKey} from "./privateKey";
+import {PublicKey} from "./publicKey";
+import {Signature} from "./signature";
+import {IBls} from "../interface";
+import {functionalInterfaceFactory} from "../functional";
+export * from "../constants";
+
+export {PrivateKey, PublicKey, Signature};
+
+export async function init(): Promise<void> {
+  // Native bindings require no init() call
+}
+export function destroy(): void {
+  // Native bindings require no destroy() call
+}
+
+export const bls: IBls = {
+  PrivateKey,
+  PublicKey,
+  Signature,
+
+  ...functionalInterfaceFactory({PrivateKey, PublicKey, Signature}),
+  init,
+  destroy,
+};
+
+export default bls;
--- a/src/blst/privateKey.ts
+++ b/src/blst/privateKey.ts
@ -0,0 +1,46 @@
+import * as blst from "@chainsafe/blst";
+import {bytesToHex, hexToBytes, randomBytes} from "../helpers";
+import {SECRET_KEY_LENGTH} from "../constants";
+import {IPrivateKey} from "../interface";
+import {PublicKey} from "./publicKey";
+import {Signature} from "./signature";
+
+export class PrivateKey implements IPrivateKey {
+  readonly value: blst.SecretKey;
+
+  constructor(value: blst.SecretKey) {
+    this.value = value;
+  }
+
+  static fromBytes(bytes: Uint8Array): PrivateKey {
+    const sk = blst.SecretKey.fromBytes(bytes);
+    return new PrivateKey(sk);
+  }
+
+  static fromHex(hex: string): PrivateKey {
+    return this.fromBytes(hexToBytes(hex));
+  }
+
+  static fromKeygen(entropy?: Uint8Array): PrivateKey {
+    const sk = blst.SecretKey.fromKeygen(entropy || randomBytes(SECRET_KEY_LENGTH));
+    return new PrivateKey(sk);
+  }
+
+  sign(message: Uint8Array): Signature {
+    return new Signature(this.value.sign(message));
+  }
+
+  toPublicKey(): PublicKey {
+    const jacobian = this.value.toAggregatePublicKey();
+    const affine = jacobian.toPublicKey();
+    return new PublicKey(affine, jacobian);
+  }
+
+  toBytes(): Uint8Array {
+    return this.value.toBytes();
+  }
+
+  toHex(): string {
+    return bytesToHex(this.toBytes());
+  }
+}
--- a/src/blst/publicKey.ts
+++ b/src/blst/publicKey.ts
@ -0,0 +1,42 @@
+import * as blst from "@chainsafe/blst";
+import {bytesToHex, hexToBytes} from "../helpers";
+import {IPublicKey} from "../interface";
+import {Signature} from "./signature";
+
+export class PublicKey implements IPublicKey {
+  readonly affine: blst.PublicKey;
+  readonly jacobian: blst.AggregatePublicKey;
+
+  constructor(affine: blst.PublicKey, jacobian: blst.AggregatePublicKey) {
+    this.affine = affine;
+    this.jacobian = jacobian;
+  }
+
+  static fromBytes(bytes: Uint8Array): PublicKey {
+    const affine = blst.PublicKey.fromBytes(bytes);
+    const jacobian = blst.AggregatePublicKey.fromPublicKey(affine);
+    return new PublicKey(affine, jacobian);
+  }
+
+  static fromHex(hex: string): PublicKey {
+    return this.fromBytes(hexToBytes(hex));
+  }
+
+  static aggregate(pubkeys: PublicKey[]): PublicKey {
+    const jacobian = blst.aggregatePubkeys(pubkeys.map((pk) => pk.jacobian));
+    const affine = jacobian.toPublicKey();
+    return new PublicKey(affine, jacobian);
+  }
+
+  verifyMessage(signature: Signature, message: Uint8Array): boolean {
+    return signature.verify(this, message);
+  }
+
+  toBytes(): Uint8Array {
+    return this.affine.toBytes();
+  }
+
+  toHex(): string {
+    return bytesToHex(this.toBytes());
+  }
+}
--- a/src/blst/signature.ts
+++ b/src/blst/signature.ts
@ -0,0 +1,60 @@
+import * as blst from "@chainsafe/blst";
+import {bytesToHex, hexToBytes} from "../helpers";
+import {ISignature} from "../interface";
+import {PublicKey} from "./publicKey";
+
+export class Signature implements ISignature {
+  readonly affine: blst.Signature;
+
+  constructor(value: blst.Signature) {
+    this.affine = value;
+  }
+
+  static fromBytes(bytes: Uint8Array): Signature {
+    return new Signature(blst.Signature.fromBytes(bytes));
+  }
+
+  static fromHex(hex: string): Signature {
+    return this.fromBytes(hexToBytes(hex));
+  }
+
+  static aggregate(signatures: Signature[]): Signature {
+    const agg = blst.AggregateSignature.fromSignatures(signatures.map((sig) => sig.affine));
+    return new Signature(agg.toSignature());
+  }
+
+  verify(publicKey: PublicKey, message: Uint8Array): boolean {
+    return this.aggregateVerify([message], [publicKey.affine]);
+  }
+
+  verifyAggregate(publicKeys: PublicKey[], message: Uint8Array): boolean {
+    const agg = PublicKey.aggregate(publicKeys);
+    return this.aggregateVerify([message], [agg.affine]);
+  }
+
+  verifyMultiple(publicKeys: PublicKey[], messages: Uint8Array[]): boolean {
+    return this.aggregateVerify(
+      messages,
+      publicKeys.map((pk) => pk.affine)
+    );
+  }
+
+  toBytes(): Uint8Array {
+    return this.affine.toBytes();
+  }
+
+  toHex(): string {
+    return bytesToHex(this.toBytes());
+  }
+
+  private aggregateVerify(msgs: Uint8Array[], pks: blst.PublicKey[]): boolean {
+    // If this set is simply an infinity signature and infinity pubkey then skip verification.
+    // This has the effect of always declaring that this sig/pubkey combination is valid.
+    // for Eth2.0 specs tests
+    if (this.affine.value.is_inf() && pks.length === 1 && pks[0].value.is_inf()) {
+      return true;
+    }
+
+    return blst.aggregateVerify(msgs, pks, this.affine);
+  }
+}
--- a/src/constants.ts
+++ b/src/constants.ts
@ -3,3 +3,5 @@ export const SIGNATURE_LENGTH = 96;
 export const FP_POINT_LENGTH = 48;
 export const PUBLIC_KEY_LENGTH = FP_POINT_LENGTH;
 export const G2_HASH_PADDING = 16;
+export const EMPTY_PUBLIC_KEY = new Uint8Array(PUBLIC_KEY_LENGTH);
+export const EMPTY_SIGNATURE = new Uint8Array(SIGNATURE_LENGTH);
--- a/src/functional.ts
+++ b/src/functional.ts
@ -0,0 +1,114 @@
+import {validateBytes} from "./helpers";
+import {IBls} from "./interface";
+
+// Returned type is enforced at each implementation's index
+// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
+export function functionalInterfaceFactory({
+  PrivateKey,
+  PublicKey,
+  Signature,
+}: Pick<IBls, "PrivateKey" | "PublicKey" | "Signature">) {
+  /**
+   * Signs given message using secret key.
+   * @param secretKey
+   * @param message
+   */
+  function sign(secretKey: Uint8Array, message: Uint8Array): Uint8Array {
+    validateBytes(secretKey, "secretKey");
+    validateBytes(message, "message");
+
+    const privateKey = PrivateKey.fromBytes(secretKey);
+    return privateKey.sign(message).toBytes();
+  }
+
+  /**
+   * Compines all given signature into one.
+   * @param signatures
+   */
+  function aggregateSignatures(signatures: Uint8Array[]): Uint8Array {
+    const agg = Signature.aggregate(signatures.map((p) => Signature.fromBytes(p)));
+    return agg.toBytes();
+  }
+
+  /**
+   * Combines all given public keys into single one
+   * @param publicKeys
+   */
+  function aggregatePubkeys(publicKeys: Uint8Array[]): Uint8Array {
+    const agg = PublicKey.aggregate(publicKeys.map((p) => PublicKey.fromBytes(p)));
+    return agg.toBytes();
+  }
+
+  /**
+   * Verifies if signature is message signed with given public key.
+   * @param publicKey
+   * @param message
+   * @param signature
+   */
+  function verify(publicKey: Uint8Array, message: Uint8Array, signature: Uint8Array): boolean {
+    validateBytes(publicKey, "publicKey");
+    validateBytes(message, "message");
+    validateBytes(signature, "signature");
+
+    try {
+      return Signature.fromBytes(signature).verify(PublicKey.fromBytes(publicKey), message);
+    } catch (e) {
+      return false;
+    }
+  }
+
+  /**
+   * Verifies if aggregated signature is same message signed with given public keys.
+   * @param publicKeys
+   * @param message
+   * @param signature
+   */
+  function verifyAggregate(publicKeys: Uint8Array[], message: Uint8Array, signature: Uint8Array): boolean {
+    validateBytes(publicKeys, "publicKey");
+    validateBytes(message, "message");
+    validateBytes(signature, "signature");
+
+    try {
+      return Signature.fromBytes(signature).verifyAggregate(
+        publicKeys.map((pubkey) => PublicKey.fromBytes(pubkey)),
+        message
+      );
+    } catch (e) {
+      return false;
+    }
+  }
+
+  /**
+   * Verifies if signature is list of message signed with corresponding public key.
+   * @param publicKeys
+   * @param messages
+   * @param signature
+   * @param fast Check if all messages are different
+   */
+  function verifyMultiple(publicKeys: Uint8Array[], messages: Uint8Array[], signature: Uint8Array): boolean {
+    validateBytes(publicKeys, "publicKey");
+    validateBytes(messages, "message");
+    validateBytes(signature, "signature");
+
+    if (publicKeys.length === 0 || publicKeys.length != messages.length) {
+      return false;
+    }
+    try {
+      return Signature.fromBytes(signature).verifyMultiple(
+        publicKeys.map((publicKey) => PublicKey.fromBytes(publicKey)),
+        messages.map((msg) => msg)
+      );
+    } catch (e) {
+      return false;
+    }
+  }
+
+  return {
+    sign,
+    aggregateSignatures,
+    aggregatePubkeys,
+    verify,
+    verifyAggregate,
+    verifyMultiple,
+  };
+}
--- a/src/helpers/hex.ts
+++ b/src/helpers/hex.ts
@ -0,0 +1,38 @@
+/**
+ * Browser compatible fromHex method
+ * From https://github.com/herumi/bls-eth-wasm/blob/04eedb77aa96e66b4f65a0ab477228adf8090c36/src/bls.js#L62
+ */
+export function hexToBytes(hex: string): Uint8Array {
+  if (hex.startsWith("0x")) {
+    hex = hex.slice(2);
+  }
+
+  if (hex.length & 1) {
+    throw Error("hexToBytes:length must be even " + hex.length);
+  }
+
+  const n = hex.length / 2;
+  const a = new Uint8Array(n);
+
+  for (let i = 0; i < n; i++) {
+    a[i] = parseInt(hex.slice(i * 2, i * 2 + 2), 16);
+  }
+
+  return a;
+}
+
+/**
+ * Browser compatible toHex method
+ * From https://github.com/herumi/bls-eth-wasm/blob/04eedb77aa96e66b4f65a0ab477228adf8090c36/src/bls.js#L50
+ */
+export function bytesToHex(bytes: Uint8Array): string {
+  // return "0x" + Buffer.from(bytes).toString("hex");
+  let s = "";
+  const n = bytes.length;
+
+  for (let i = 0; i < n; i++) {
+    s += ("0" + bytes[i].toString(16)).slice(-2);
+  }
+
+  return "0x" + s;
+}
--- a/src/helpers/index.ts
+++ b/src/helpers/index.ts
@ -0,0 +1,2 @@
+export * from "./hex";
+export * from "./utils";
--- a/src/helpers/utils.ts
+++ b/src/helpers/utils.ts
@ -1,18 +1,26 @@
-import assert from "assert";
-import {PUBLIC_KEY_LENGTH, SIGNATURE_LENGTH} from "../constants";
+import randomBytes from "randombytes";

-/**
- * Pads byte array with zeroes on left side up to desired length.
- * Throws if source is larger than desired result.
- * @param source
- * @param length
- */
-export function padLeft(source: Uint8Array, length: number): Buffer {
-  assert(source.length <= length, "Given array must be smaller or equal to desired array size");
-  const result = Buffer.alloc(length, 0);
-  result.set(source, length - source.length);
-  return result;
+// Single import to ease changing this lib if necessary
+export {randomBytes};
+
+export function isEqualBytes(a: Buffer | Uint8Array, b: Buffer | Uint8Array): boolean {
+  return toBuffer(a).equals(toBuffer(b));
 }

-export const EMPTY_PUBLIC_KEY = Buffer.alloc(PUBLIC_KEY_LENGTH);
-export const EMPTY_SIGNATURE = Buffer.alloc(SIGNATURE_LENGTH);
+export function toBuffer(input: Uint8Array): Buffer {
+  return Buffer.from(input.buffer, input.byteOffset, input.length);
+}
+
+/**
+ * Validate bytes to prevent confusing WASM errors downstream if bytes is null
+ */
+export function validateBytes(
+  bytes: Uint8Array | Uint8Array[] | null,
+  argName?: string
+): asserts bytes is NonNullable<typeof bytes> {
+  for (const item of Array.isArray(bytes) ? bytes : [bytes]) {
+    if (item == null) {
+      throw Error(`${argName || "bytes"} is null or undefined`);
+    }
+  }
+}
--- a/src/herumi/context.ts
+++ b/src/herumi/context.ts
@ -1,20 +1,19 @@
 /* eslint-disable require-atomic-updates */
-import bls from "@chainsafe/eth2-bls-wasm";
+import bls from "bls-eth-wasm";

 type Bls = typeof bls;
 let blsGlobal: Bls | null = null;
-let blsGlobalPromise: Promise<Bls> | null = null;
+let blsGlobalPromise: Promise<void> | null = null;

-export async function setupBls(): Promise<Bls> {
+export async function setupBls(): Promise<void> {
  if (!blsGlobal) {
-    await bls.init();
+    await bls.init(bls.BLS12_381);
    blsGlobal = bls;
  }
-  return blsGlobal;
 }

 // Cache a promise for Bls instead of Bls to make sure it is initialized only once
-export async function init(): Promise<Bls> {
+export async function init(): Promise<void> {
  if (!blsGlobalPromise) {
    blsGlobalPromise = setupBls();
  }
--- a/src/herumi/index.ts
+++ b/src/herumi/index.ts
@ -0,0 +1,21 @@
+import {PrivateKey} from "./privateKey";
+import {PublicKey} from "./publicKey";
+import {Signature} from "./signature";
+import {init, destroy} from "./context";
+import {IBls} from "../interface";
+import {functionalInterfaceFactory} from "../functional";
+export * from "../constants";
+
+export {PrivateKey, PublicKey, Signature, init, destroy};
+
+export const bls: IBls = {
+  PrivateKey,
+  PublicKey,
+  Signature,
+
+  ...functionalInterfaceFactory({PrivateKey, PublicKey, Signature}),
+  init,
+  destroy,
+};
+
+export default bls;
--- a/src/herumi/privateKey.ts
+++ b/src/herumi/privateKey.ts
@ -0,0 +1,52 @@
+import {SecretKeyType} from "bls-eth-wasm";
+import {generateRandomSecretKey} from "@chainsafe/bls-keygen";
+import {SECRET_KEY_LENGTH} from "../constants";
+import {getContext} from "./context";
+import {PublicKey} from "./publicKey";
+import {Signature} from "./signature";
+import {bytesToHex, hexToBytes} from "../helpers";
+import {IPrivateKey} from "../interface";
+
+export class PrivateKey implements IPrivateKey {
+  readonly value: SecretKeyType;
+
+  constructor(value: SecretKeyType) {
+    this.value = value;
+  }
+
+  static fromBytes(bytes: Uint8Array): PrivateKey {
+    if (bytes.length !== SECRET_KEY_LENGTH) {
+      throw Error(`Private key should have ${SECRET_KEY_LENGTH} bytes`);
+    }
+
+    const context = getContext();
+    const secretKey = new context.SecretKey();
+    secretKey.deserialize(bytes);
+    return new PrivateKey(secretKey);
+  }
+
+  static fromHex(hex: string): PrivateKey {
+    return this.fromBytes(hexToBytes(hex));
+  }
+
+  static fromKeygen(entropy?: Uint8Array): PrivateKey {
+    const sk = generateRandomSecretKey(entropy && Buffer.from(entropy));
+    return this.fromBytes(sk);
+  }
+
+  sign(message: Uint8Array): Signature {
+    return new Signature(this.value.sign(message));
+  }
+
+  toPublicKey(): PublicKey {
+    return new PublicKey(this.value.getPublicKey());
+  }
+
+  toBytes(): Uint8Array {
+    return this.value.serialize();
+  }
+
+  toHex(): string {
+    return bytesToHex(this.toBytes());
+  }
+}
--- a/src/herumi/publicKey.ts
+++ b/src/herumi/publicKey.ts
@ -0,0 +1,61 @@
+import {PublicKeyType} from "bls-eth-wasm";
+import {getContext} from "./context";
+import {EMPTY_PUBLIC_KEY, PUBLIC_KEY_LENGTH} from "../constants";
+import {Signature} from "./signature";
+import {bytesToHex, hexToBytes, isEqualBytes} from "../helpers";
+import {IPublicKey} from "../interface";
+
+export class PublicKey implements IPublicKey {
+  readonly value: PublicKeyType;
+
+  constructor(value: PublicKeyType) {
+    this.value = value;
+  }
+
+  static fromBytes(bytes: Uint8Array): PublicKey {
+    if (bytes.length !== PUBLIC_KEY_LENGTH) {
+      throw Error(`Public key must have ${PUBLIC_KEY_LENGTH} bytes`);
+    }
+
+    const context = getContext();
+    const publicKey = new context.PublicKey();
+    if (!isEqualBytes(EMPTY_PUBLIC_KEY, bytes)) {
+      publicKey.deserialize(bytes);
+    }
+    return new PublicKey(publicKey);
+  }
+
+  static fromHex(hex: string): PublicKey {
+    return this.fromBytes(hexToBytes(hex));
+  }
+
+  static aggregate(pubkeys: PublicKey[]): PublicKey {
+    if (pubkeys.length === 0) {
+      throw Error("EMPTY_AGGREGATE_ARRAY");
+    }
+
+    const agg = new PublicKey(pubkeys[0].value.clone());
+    for (const pk of pubkeys.slice(1)) {
+      agg.value.add(pk.value);
+    }
+    return agg;
+  }
+
+  add(other: PublicKey): PublicKey {
+    const agg = new PublicKey(this.value.clone());
+    agg.value.add(other.value);
+    return agg;
+  }
+
+  verifyMessage(signature: Signature, message: Uint8Array): boolean {
+    return this.value.verify(signature.value, message);
+  }
+
+  toBytes(): Uint8Array {
+    return this.value.serialize();
+  }
+
+  toHex(): string {
+    return bytesToHex(this.toBytes());
+  }
+}
--- a/src/herumi/signature.ts
+++ b/src/herumi/signature.ts
@ -0,0 +1,79 @@
+import {SIGNATURE_LENGTH, EMPTY_SIGNATURE} from "../constants";
+import {SignatureType} from "bls-eth-wasm";
+import {getContext} from "./context";
+import {PublicKey} from "./publicKey";
+import {bytesToHex, hexToBytes, isEqualBytes} from "../helpers";
+import {ISignature} from "../interface";
+
+export class Signature implements ISignature {
+  readonly value: SignatureType;
+
+  constructor(value: SignatureType) {
+    if (!value.isValidOrder()) {
+      throw Error("Signature is not in valid order");
+    }
+
+    this.value = value;
+  }
+
+  static fromBytes(bytes: Uint8Array): Signature {
+    if (bytes.length !== SIGNATURE_LENGTH) {
+      throw Error(`Signature must have ${SIGNATURE_LENGTH} bytes`);
+    }
+
+    const context = getContext();
+    const signature = new context.Signature();
+    if (!isEqualBytes(EMPTY_SIGNATURE, bytes)) {
+      signature.deserialize(bytes);
+    }
+    return new Signature(signature);
+  }
+
+  static fromHex(hex: string): Signature {
+    return this.fromBytes(hexToBytes(hex));
+  }
+
+  static aggregate(signatures: Signature[]): Signature {
+    if (signatures.length === 0) {
+      throw Error("EMPTY_AGGREGATE_ARRAY");
+    }
+
+    const context = getContext();
+    const signature = new context.Signature();
+    signature.aggregate(signatures.map((sig) => sig.value));
+    return new Signature(signature);
+  }
+
+  add(other: Signature): Signature {
+    const agg = this.value.clone();
+    agg.add(other.value);
+    return new Signature(agg);
+  }
+
+  verify(publicKey: PublicKey, message: Uint8Array): boolean {
+    return publicKey.value.verify(this.value, message);
+  }
+
+  verifyAggregate(publicKeys: PublicKey[], message: Uint8Array): boolean {
+    return this.value.fastAggregateVerify(
+      publicKeys.map((key) => key.value),
+      message
+    );
+  }
+
+  verifyMultiple(publicKeys: PublicKey[], messages: Uint8Array[]): boolean {
+    const msgs = Buffer.concat(messages);
+    return this.value.aggregateVerifyNoCheck(
+      publicKeys.map((key) => key.value),
+      msgs
+    );
+  }
+
+  toBytes(): Uint8Array {
+    return this.value.serialize();
+  }
+
+  toHex(): string {
+    return bytesToHex(this.toBytes());
+  }
+}
--- a/src/herumi/web.ts
+++ b/src/herumi/web.ts
@ -1,4 +1,4 @@
-import bls from "./index";
+import {bls} from "./index";

 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 (function (window: any) {
--- a/src/index.ts
+++ b/src/index.ts
@ -1,155 +1,31 @@
-import {Keypair} from "./keypair";
-import {PrivateKey} from "./privateKey";
-import {PublicKey} from "./publicKey";
-import {Signature} from "./signature";
-import {PUBLIC_KEY_LENGTH} from "./constants";
-import assert from "assert";
+import {IBls} from "./interface";
+import {bls as blsHerumi} from "./herumi";

-export {Keypair, PrivateKey, PublicKey, Signature};
+export type Implementation = "herumi" | "blst-native";

-export {init as initBLS} from "./context";
+// TODO: Use a Proxy for example to throw an error if it's not initialized yet
+export let bls: IBls;

-function toBuffer(input: Uint8Array): Buffer {
-  return Buffer.from(input.buffer, input.byteOffset, input.length);
+async function getImplementation(impl: Implementation = "herumi"): Promise<IBls> {
+  switch (impl) {
+    case "herumi":
+      await blsHerumi.init();
+      return blsHerumi;
+
+    case "blst-native":
+      if (typeof require !== "function") {
+        throw Error("blst-native is only supported in NodeJS");
      }
+      // eslint-disable-next-line @typescript-eslint/no-require-imports
+      return require("./blst");

-/**
- * Generates new secret and public key
- */
-export function generateKeyPair(): Keypair {
-  return Keypair.generate();
-}
-
-/**
- * Generates public key from given secret.
- * @param {BLSSecretKey} secretKey
- */
-export function generatePublicKey(secretKey: Uint8Array): Buffer {
-  assert(secretKey, "secretKey is null or undefined");
-  const keypair = new Keypair(PrivateKey.fromBytes(toBuffer(secretKey)));
-  return keypair.publicKey.toBytesCompressed();
-}
-
-/**
- * Signs given message using secret key.
- * @param secretKey
- * @param messageHash
- */
-export function sign(secretKey: Uint8Array, messageHash: Uint8Array): Buffer {
-  assert(secretKey, "secretKey is null or undefined");
-  assert(messageHash, "messageHash is null or undefined");
-  const privateKey = PrivateKey.fromBytes(toBuffer(secretKey));
-  return privateKey.signMessage(toBuffer(messageHash)).toBytesCompressed();
-}
-
-/**
- * Compines all given signature into one.
- * @param signatures
- */
-export function aggregateSignatures(signatures: Uint8Array[]): Buffer {
-  assert(signatures && signatures.length > 0, "signatures is null or undefined or empty array");
-  return Signature.aggregate(
-    signatures.map(
-      (signature): Signature => {
-        return Signature.fromCompressedBytes(signature);
-      }
-    )
-  ).toBytesCompressed();
-}
-
-/**
- * Combines all given public keys into single one
- * @param publicKeys
- */
-export function aggregatePubkeys(publicKeys: Uint8Array[]): Buffer {
-  assert(publicKeys, "publicKeys is null or undefined");
-  if (publicKeys.length === 0) {
-    return Buffer.alloc(PUBLIC_KEY_LENGTH);
-  }
-  return publicKeys
-    .map((p) => PublicKey.fromBytes(toBuffer(p)))
-    .reduce((agg, pubKey) => agg.add(pubKey))
-    .toBytesCompressed();
-}
-
-/**
- * Verifies if signature is message signed with given public key.
- * @param publicKey
- * @param messageHash
- * @param signature
- */
-export function verify(publicKey: Uint8Array, messageHash: Uint8Array, signature: Uint8Array): boolean {
-  assert(publicKey, "publicKey is null or undefined");
-  assert(messageHash, "messageHash is null or undefined");
-  assert(signature, "signature is null or undefined");
-  try {
-    return PublicKey.fromBytes(publicKey).verifyMessage(
-      Signature.fromCompressedBytes(toBuffer(signature)),
-      toBuffer(messageHash)
-    );
-  } catch (e) {
-    return false;
+    default:
+      throw new Error(`Unsupported implementation - ${impl}`);
  }
 }

-/**
- * Verifies if aggregated signature is same message signed with given public keys.
- * @param publicKeys
- * @param messageHash
- * @param signature
- */
-export function verifyAggregate(publicKeys: Uint8Array[], messageHash: Uint8Array, signature: Uint8Array): boolean {
-  assert(publicKeys, "publicKey is null or undefined");
-  assert(messageHash, "messageHash is null or undefined");
-  assert(signature, "signature is null or undefined");
-  try {
-    return Signature.fromCompressedBytes(signature).verifyAggregate(
-      publicKeys.map((pubkey) => PublicKey.fromBytes(pubkey)),
-      messageHash
-    );
-  } catch (e) {
-    return false;
-  }
+export async function init(impl: Implementation): Promise<void> {
+  bls = await getImplementation(impl);
 }

-/**
- * Verifies if signature is list of message signed with corresponding public key.
- * @param publicKeys
- * @param messageHashes
- * @param signature
- * @param fast Check if all messages are different
- */
-export function verifyMultiple(
-  publicKeys: Uint8Array[],
-  messageHashes: Uint8Array[],
-  signature: Uint8Array,
-  fast = false
-): boolean {
-  assert(publicKeys, "publicKey is null or undefined");
-  assert(messageHashes, "messageHash is null or undefined");
-  assert(signature, "signature is null or undefined");
-
-  if (publicKeys.length === 0 || publicKeys.length != messageHashes.length) {
-    return false;
-  }
-  try {
-    return Signature.fromCompressedBytes(toBuffer(signature)).verifyMultiple(
-      publicKeys.map((key) => PublicKey.fromBytes(toBuffer(key))),
-      messageHashes.map((m) => toBuffer(m)),
-      fast
-    );
-  } catch (e) {
-    return false;
-  }
-}
-
-export default {
-  generateKeyPair,
-  generatePublicKey,
-  sign,
-  aggregateSignatures,
-  aggregatePubkeys,
-  verify,
-  verifyAggregate,
-  verifyMultiple,
-};
+export default bls;
--- a/src/interface.ts
+++ b/src/interface.ts
@ -0,0 +1,52 @@
+export interface IBls {
+  PrivateKey: {
+    fromBytes(bytes: Uint8Array): IPrivateKey;
+    fromHex(hex: string): IPrivateKey;
+    fromKeygen(): IPrivateKey;
+  };
+  PublicKey: {
+    fromBytes(bytes: Uint8Array): IPublicKey;
+    fromHex(hex: string): IPublicKey;
+    aggregate(pubkeys: IPublicKey[]): IPublicKey;
+  };
+  Signature: {
+    fromBytes(bytes: Uint8Array): ISignature;
+    fromHex(hex: string): ISignature;
+    aggregate(signatures: ISignature[]): ISignature;
+  };
+
+  sign(secretKey: Uint8Array, message: Uint8Array): Uint8Array;
+  aggregatePubkeys(publicKeys: Uint8Array[]): Uint8Array;
+  aggregateSignatures(signatures: Uint8Array[]): Uint8Array;
+  verify(publicKey: Uint8Array, message: Uint8Array, signature: Uint8Array): boolean;
+  verifyAggregate(publicKeys: Uint8Array[], message: Uint8Array, signature: Uint8Array): boolean;
+  verifyMultiple(publicKeys: Uint8Array[], messages: Uint8Array[], signature: Uint8Array): boolean;
+
+  init(): Promise<void>;
+  destroy(): void;
+}
+
+export interface IKeypair {
+  publicKey: IPublicKey;
+  privateKey: IPrivateKey;
+}
+
+export interface IPublicKey {
+  toBytes(): Uint8Array;
+  toHex(): string;
+}
+
+export interface ISignature {
+  toBytes(): Uint8Array;
+  toHex(): string;
+  verify(publicKey: IPublicKey, message: Uint8Array): boolean;
+  verifyAggregate(publicKeys: IPublicKey[], message: Uint8Array): boolean;
+  verifyMultiple(publicKeys: IPublicKey[], messages: Uint8Array[]): boolean;
+}
+
+export interface IPrivateKey {
+  toPublicKey(): IPublicKey;
+  sign(message: Uint8Array): ISignature;
+  toBytes(): Uint8Array;
+  toHex(): string;
+}
--- a/src/keypair.ts
+++ b/src/keypair.ts
@ -1,29 +0,0 @@
-import {PublicKey} from "./publicKey";
-import {PrivateKey} from "./privateKey";
-
-export class Keypair {
-  private readonly _publicKey: PublicKey;
-
-  private readonly _privateKey: PrivateKey;
-
-  public constructor(privateKey: PrivateKey, publicKey?: PublicKey) {
-    this._privateKey = privateKey;
-    if (!publicKey) {
-      this._publicKey = PublicKey.fromPrivateKey(this._privateKey);
-    } else {
-      this._publicKey = publicKey;
-    }
-  }
-
-  public get publicKey(): PublicKey {
-    return this._publicKey;
-  }
-
-  public get privateKey(): PrivateKey {
-    return this._privateKey;
-  }
-
-  public static generate(): Keypair {
-    return new Keypair(PrivateKey.random());
-  }
-}
--- a/src/privateKey.ts
+++ b/src/privateKey.ts
@ -1,66 +0,0 @@
-import {SECRET_KEY_LENGTH} from "./constants";
-import assert from "assert";
-import {SecretKeyType} from "@chainsafe/eth2-bls-wasm";
-import {generateRandomSecretKey} from "@chainsafe/bls-keygen";
-import {getContext} from "./context";
-import {PublicKey} from "./publicKey";
-import {Signature} from "./signature";
-
-export class PrivateKey {
-  private value: SecretKeyType;
-
-  protected constructor(value: SecretKeyType) {
-    this.value = value;
-  }
-
-  public static fromBytes(bytes: Uint8Array): PrivateKey {
-    assert(bytes.length === SECRET_KEY_LENGTH, "Private key should have 32 bytes");
-    const context = getContext();
-    const secretKey = new context.SecretKey();
-    secretKey.deserialize(Buffer.from(bytes));
-    return new PrivateKey(secretKey);
-  }
-
-  public static fromHexString(value: string): PrivateKey {
-    value = value.replace("0x", "");
-    assert(value.length === SECRET_KEY_LENGTH * 2, "secret key must have 32 bytes");
-    const context = getContext();
-    return new PrivateKey(context.deserializeHexStrToSecretKey(value));
-  }
-
-  public static fromInt(num: number): PrivateKey {
-    const context = getContext();
-    const secretKey = new context.SecretKey();
-    secretKey.setInt(num);
-    return new PrivateKey(secretKey);
-  }
-
-  public static random(): PrivateKey {
-    const randomKey: Buffer = generateRandomSecretKey();
-    return this.fromBytes(randomKey);
-  }
-
-  public getValue(): SecretKeyType {
-    return this.value;
-  }
-
-  // public sign(message: Uint8Array): Signature {
-  //   return Signature.fromValue(this.value.sign(message));
-  // }
-
-  public signMessage(message: Uint8Array): Signature {
-    return Signature.fromValue(this.value.sign(message));
-  }
-
-  public toPublicKey(): PublicKey {
-    return PublicKey.fromPublicKeyType(this.value.getPublicKey());
-  }
-
-  public toBytes(): Buffer {
-    return Buffer.from(this.value.serialize());
-  }
-
-  public toHexString(): string {
-    return `0x${this.value.serializeToHexStr()}`;
-  }
-}
--- a/src/publicKey.ts
+++ b/src/publicKey.ts
@ -1,61 +0,0 @@
-import {PrivateKey} from "./privateKey";
-import {PublicKeyType} from "@chainsafe/eth2-bls-wasm";
-import {getContext} from "./context";
-import {PUBLIC_KEY_LENGTH} from "./constants";
-import assert from "assert";
-import {Signature} from "./signature";
-import {EMPTY_PUBLIC_KEY} from "./helpers/utils";
-
-export class PublicKey {
-  private value: PublicKeyType;
-
-  protected constructor(value: PublicKeyType) {
-    this.value = value;
-  }
-
-  public static fromPrivateKey(privateKey: PrivateKey): PublicKey {
-    return privateKey.toPublicKey();
-  }
-
-  public static fromBytes(bytes: Uint8Array): PublicKey {
-    const context = getContext();
-    const publicKey = new context.PublicKey();
-    if (!EMPTY_PUBLIC_KEY.equals(bytes)) {
-      publicKey.deserialize(bytes);
-    }
-    return new PublicKey(publicKey);
-  }
-
-  public static fromHex(value: string): PublicKey {
-    value = value.replace("0x", "");
-    assert(value.length === PUBLIC_KEY_LENGTH * 2);
-    const context = getContext();
-    return new PublicKey(context.deserializeHexStrToPublicKey(value));
-  }
-
-  public static fromPublicKeyType(value: PublicKeyType): PublicKey {
-    return new PublicKey(value);
-  }
-
-  public add(other: PublicKey): PublicKey {
-    const agg = new PublicKey(this.value.clone());
-    agg.value.add(other.value);
-    return agg;
-  }
-
-  public verifyMessage(signature: Signature, messageHash: Uint8Array): boolean {
-    return this.value.verify(signature.getValue(), messageHash);
-  }
-
-  public toBytesCompressed(): Buffer {
-    return Buffer.from(this.value.serialize());
-  }
-
-  public toHexString(): string {
-    return `0x${this.toBytesCompressed().toString("hex")}`;
-  }
-
-  public getValue(): PublicKeyType {
-    return this.value;
-  }
-}
--- a/src/signature.ts
+++ b/src/signature.ts
@ -1,72 +0,0 @@
-import assert from "assert";
-import {FP_POINT_LENGTH} from "./constants";
-import {SignatureType} from "@chainsafe/eth2-bls-wasm";
-import {getContext} from "./context";
-import {PublicKey} from "./publicKey";
-import {EMPTY_SIGNATURE} from "./helpers/utils";
-
-export class Signature {
-  private value: SignatureType;
-
-  protected constructor(value: SignatureType) {
-    this.value = value;
-    assert(this.value.isValidOrder());
-  }
-
-  public static fromCompressedBytes(value: Uint8Array): Signature {
-    assert(value.length === 2 * FP_POINT_LENGTH, `Signature must have ${2 * FP_POINT_LENGTH} bytes`);
-    const context = getContext();
-    const signature = new context.Signature();
-    if (!EMPTY_SIGNATURE.equals(value)) {
-      signature.deserialize(value);
-    }
-    return new Signature(signature);
-  }
-
-  public static fromValue(signature: SignatureType): Signature {
-    return new Signature(signature);
-  }
-
-  public static aggregate(signatures: Signature[]): Signature {
-    const context = getContext();
-    const signature = new context.Signature();
-    signature.aggregate(signatures.map((sig) => sig.getValue()));
-    return new Signature(signature);
-  }
-
-  public add(other: Signature): Signature {
-    const agg = this.value.clone();
-    agg.add(other.value);
-    return new Signature(agg);
-  }
-
-  public getValue(): SignatureType {
-    return this.value;
-  }
-
-  public verifyAggregate(publicKeys: PublicKey[], message: Uint8Array): boolean {
-    return this.value.fastAggregateVerify(
-      publicKeys.map((key) => key.getValue()),
-      message
-    );
-  }
-
-  public verifyMultiple(publicKeys: PublicKey[], messages: Uint8Array[], fast = false): boolean {
-    const msgs = Buffer.concat(messages);
-    if (!fast && !getContext().areAllMsgDifferent(msgs)) {
-      return false;
-    }
-    return this.value.aggregateVerifyNoCheck(
-      publicKeys.map((key) => key.getValue()),
-      msgs
-    );
-  }
-
-  public toBytesCompressed(): Buffer {
-    return Buffer.from(this.value.serialize());
-  }
-
-  public toHex(): string {
-    return "0x" + this.value.serializeToHexStr();
-  }
-}
--- a/test/benchmark/index.ts
+++ b/test/benchmark/index.ts
@ -0,0 +1,102 @@
+import {runBenchmark} from "./runner";
+import {runForAllImplementations} from "../switch";
+import {IPublicKey, ISignature} from "../../src/interface";
+import {randomBytes} from "../../src/helpers";
+
+runForAllImplementations(async (bls, implementation) => {
+  await bls.init();
+
+  const aggCount = 30;
+
+  // verify
+
+  runBenchmark<{pk: IPublicKey; msg: Uint8Array; sig: ISignature}, boolean>({
+    id: `${implementation} verify`,
+
+    prepareTest: () => {
+      const msg = randomMsg();
+      const sk = bls.PrivateKey.fromKeygen();
+      const pk = sk.toPublicKey();
+      const sig = sk.sign(msg);
+      return {
+        input: {pk, msg, sig},
+        resultCheck: (valid) => valid === true,
+      };
+    },
+    testRunner: ({pk, msg, sig}) => {
+      return sig.verify(pk, msg);
+    },
+  });
+
+  // Fast aggregate
+
+  runBenchmark<{pks: IPublicKey[]; msg: Uint8Array; sig: ISignature}, boolean>({
+    id: `${implementation} verifyAggregate`,
+
+    prepareTest: () => {
+      const msg = randomMsg();
+      const dataArr = range(aggCount).map(() => {
+        const sk = bls.PrivateKey.fromKeygen();
+        const pk = sk.toPublicKey();
+        const sig = sk.sign(msg);
+        return {pk, sig};
+      });
+
+      const pks = dataArr.map((data) => data.pk);
+      const sig = bls.Signature.aggregate(dataArr.map((data) => data.sig));
+
+      return {
+        input: {pks, msg, sig},
+        resultCheck: (valid) => valid === true,
+      };
+    },
+    testRunner: ({pks, msg, sig}) => {
+      return sig.verifyAggregate(pks, msg);
+    },
+  });
+
+  // Aggregate pubkeys
+
+  runBenchmark<IPublicKey[], void>({
+    id: `${implementation} aggregate pubkeys (${aggCount})`,
+
+    prepareTest: () => {
+      return {
+        input: range(aggCount).map(() => bls.PrivateKey.fromKeygen().toPublicKey()),
+      };
+    },
+    testRunner: (pks) => {
+      bls.PublicKey.aggregate(pks);
+    },
+  });
+
+  // Aggregate sigs
+
+  runBenchmark<ISignature[], void>({
+    id: `${implementation} aggregate signatures (${aggCount})`,
+
+    prepareTest: () => {
+      const msg = randomMsg();
+      const sigs = range(aggCount).map(() => {
+        const sk = bls.PrivateKey.fromKeygen();
+        return sk.sign(msg);
+      });
+      return {
+        input: sigs,
+      };
+    },
+    testRunner: (sigs) => {
+      bls.Signature.aggregate(sigs);
+    },
+  });
+});
+
+function range(n: number): number[] {
+  const nums: number[] = [];
+  for (let i = 0; i < n; i++) nums.push(i);
+  return nums;
+}
+
+function randomMsg(): Uint8Array {
+  return randomBytes(32);
+}
--- a/test/benchmark/runner.ts
+++ b/test/benchmark/runner.ts
@ -0,0 +1,34 @@
+export function runBenchmark<T, R>({
+  prepareTest,
+  testRunner,
+  runs = 100,
+  id,
+}: {
+  prepareTest: (i: number) => {input: T; resultCheck?: (result: R) => boolean};
+  testRunner: (input: T) => R;
+  runs?: number;
+  id: string;
+}): void {
+  const diffsNanoSec: bigint[] = [];
+
+  for (let i = 0; i < runs; i++) {
+    const {input, resultCheck} = prepareTest(i);
+
+    const start = process.hrtime.bigint();
+    const result = testRunner(input);
+    const end = process.hrtime.bigint();
+
+    if (resultCheck && !resultCheck(result)) throw Error("Result fails check test");
+    diffsNanoSec.push(end - start);
+  }
+
+  const average = averageBigint(diffsNanoSec);
+  const opsPerSec = 1e9 / Number(average);
+  // eslint-disable-next-line no-console
+  console.log(`${id}: ${opsPerSec.toPrecision(5)} ops/sec (${runs} runs)`); // ±1.74%
+}
+
+function averageBigint(arr: bigint[]): bigint {
+  const total = arr.reduce((total, value) => total + value);
+  return total / BigInt(arr.length);
+}
--- a/test/params.ts
+++ b/test/params.ts
@ -0,0 +1,2 @@
+import path from "path";
+export const SPEC_TESTS_DIR = path.join(__dirname, "../node_modules/@chainsafe/eth2-spec-tests/tests");
--- a/test/spec/aggregate_sigs.test.ts
+++ b/test/spec/aggregate_sigs.test.ts
@ -1,6 +1,8 @@
 import path from "path";
-import bls, {initBLS} from "../../src";
 import {describeDirectorySpecTest, InputType} from "@chainsafe/lodestar-spec-test-util";
+import {bytesToHex, hexToBytes} from "../../src/helpers";
+import {SPEC_TESTS_DIR} from "../params";
+import {describeForAllImplementations} from "../switch";

 interface IAggregateSigsTestCase {
  data: {
@ -9,32 +11,23 @@ interface IAggregateSigsTestCase {
  };
 }

-before(async function f() {
-  await initBLS();
-});
-
+describeForAllImplementations((bls) => {
  describeDirectorySpecTest<IAggregateSigsTestCase, string>(
-  "BLS - aggregate sigs",
-  path.join(__dirname, "../../node_modules/@chainsafe/eth2-spec-tests/tests/general/phase0/bls/aggregate/small"),
+    "bls/aggregate/small",
+    path.join(SPEC_TESTS_DIR, "general/phase0/bls/aggregate/small"),
    (testCase) => {
      try {
-      const result = bls.aggregateSignatures(
-        testCase.data.input.map((pubKey) => {
-          return Buffer.from(pubKey.replace("0x", ""), "hex");
-        })
-      );
-      return `0x${result.toString("hex")}`;
+        const signatures = testCase.data.input;
+        const agg = bls.aggregateSignatures(signatures.map(hexToBytes));
+        return bytesToHex(agg);
      } catch (e) {
-      if (e.message === "signatures is null or undefined or empty array") {
-        return null;
-      }
+        if (e.message === "EMPTY_AGGREGATE_ARRAY") return null;
        throw e;
      }
    },
    {
-    inputTypes: {
-      data: InputType.YAML,
-    },
+      inputTypes: {data: InputType.YAML},
      getExpected: (testCase) => testCase.data.output,
    }
  );
+});
--- a/test/spec/aggregate_sigs_verify.test.ts
+++ b/test/spec/aggregate_sigs_verify.test.ts
@ -1,6 +1,8 @@
 import path from "path";
-import bls, {initBLS} from "../../src";
 import {describeDirectorySpecTest, InputType} from "@chainsafe/lodestar-spec-test-util";
+import {hexToBytes} from "../../src/helpers";
+import {SPEC_TESTS_DIR} from "../params";
+import {describeForAllImplementations} from "../switch";

 interface IAggregateSigsVerifyTestCase {
  data: {
@ -13,30 +15,17 @@ interface IAggregateSigsVerifyTestCase {
  };
 }

-before(async function f() {
-  try {
-    await initBLS();
-  } catch (e) {
-    console.log(e);
-  }
-});
-
+describeForAllImplementations((bls) => {
  describeDirectorySpecTest<IAggregateSigsVerifyTestCase, boolean>(
-  "BLS - aggregate sigs verify",
-  path.join(__dirname, "../../node_modules/@chainsafe/eth2-spec-tests/tests/general/phase0/bls/aggregate_verify/small"),
+    "bls/aggregate_verify/small",
+    path.join(SPEC_TESTS_DIR, "general/phase0/bls/aggregate_verify/small"),
    (testCase) => {
-    const pubkeys = testCase.data.input.pubkeys.map((pubkey) => {
-      return Buffer.from(pubkey.replace("0x", ""), "hex");
-    });
-    const messages = testCase.data.input.messages.map((msg) => {
-      return Buffer.from(msg.replace("0x", ""), "hex");
-    });
-    return bls.verifyMultiple(pubkeys, messages, Buffer.from(testCase.data.input.signature.replace("0x", ""), "hex"));
+      const {pubkeys, messages, signature} = testCase.data.input;
+      return bls.verifyMultiple(pubkeys.map(hexToBytes), messages.map(hexToBytes), hexToBytes(signature));
    },
    {
-    inputTypes: {
-      data: InputType.YAML,
-    },
+      inputTypes: {data: InputType.YAML},
      getExpected: (testCase) => testCase.data.output,
    }
  );
+});
--- a/test/spec/fast_aggregate_verify.test.ts
+++ b/test/spec/fast_aggregate_verify.test.ts
@ -1,6 +1,8 @@
 import path from "path";
-import bls, {initBLS} from "../../src";
 import {describeDirectorySpecTest, InputType} from "@chainsafe/lodestar-spec-test-util";
+import {hexToBytes} from "../../src/helpers";
+import {SPEC_TESTS_DIR} from "../params";
+import {describeForAllImplementations} from "../switch";

 interface IAggregateSigsVerifyTestCase {
  data: {
@ -13,31 +15,17 @@ interface IAggregateSigsVerifyTestCase {
  };
 }

-before(async function f() {
-  try {
-    await initBLS();
-  } catch (e) {
-    console.log(e);
-  }
-});
-
+describeForAllImplementations((bls) => {
  describeDirectorySpecTest<IAggregateSigsVerifyTestCase, boolean>(
-  "BLS - aggregate sigs verify",
-  path.join(
-    __dirname,
-    "../../node_modules/@chainsafe/eth2-spec-tests/tests/general/phase0/bls/fast_aggregate_verify/small"
-  ),
+    "bls/fast_aggregate_verify/small",
+    path.join(SPEC_TESTS_DIR, "general/phase0/bls/fast_aggregate_verify/small"),
    (testCase) => {
-    return bls.verifyAggregate(
-      testCase.data.input.pubkeys.map((key) => Buffer.from(key.replace("0x", ""), "hex")),
-      Buffer.from(testCase.data.input.message.replace("0x", ""), "hex"),
-      Buffer.from(testCase.data.input.signature.replace("0x", ""), "hex")
-    );
+      const {pubkeys, message, signature} = testCase.data.input;
+      return bls.verifyAggregate(pubkeys.map(hexToBytes), hexToBytes(message), hexToBytes(signature));
    },
    {
-    inputTypes: {
-      data: InputType.YAML,
-    },
+      inputTypes: {data: InputType.YAML},
      getExpected: (testCase) => testCase.data.output,
    }
  );
+});
--- a/test/spec/sign.test.ts
+++ b/test/spec/sign.test.ts
@ -1,6 +1,8 @@
 import path from "path";
-import bls, {initBLS} from "../../src";
 import {describeDirectorySpecTest, InputType} from "@chainsafe/lodestar-spec-test-util";
+import {bytesToHex, hexToBytes} from "../../src/helpers";
+import {SPEC_TESTS_DIR} from "../params";
+import {describeForAllImplementations} from "../switch";

 interface ISignMessageTestCase {
  data: {
@ -12,24 +14,18 @@ interface ISignMessageTestCase {
  };
 }

-before(async function f() {
-  await initBLS();
-});
-
+describeForAllImplementations((bls) => {
  describeDirectorySpecTest<ISignMessageTestCase, string>(
-  "BLS - sign",
-  path.join(__dirname, "../../node_modules/@chainsafe/eth2-spec-tests/tests/general/phase0/bls/sign/small"),
+    "bls/sign/small",
+    path.join(SPEC_TESTS_DIR, "general/phase0/bls/sign/small"),
    (testCase) => {
-    const signature = bls.sign(
-      Buffer.from(testCase.data.input.privkey.replace("0x", ""), "hex"),
-      Buffer.from(testCase.data.input.message.replace("0x", ""), "hex")
-    );
-    return `0x${signature.toString("hex")}`;
+      const {privkey, message} = testCase.data.input;
+      const signature = bls.sign(hexToBytes(privkey), hexToBytes(message));
+      return bytesToHex(signature);
    },
    {
-    inputTypes: {
-      data: InputType.YAML,
-    },
+      inputTypes: {data: InputType.YAML},
      getExpected: (testCase) => testCase.data.output,
    }
  );
+});
--- a/test/spec/verify.test.ts
+++ b/test/spec/verify.test.ts
@ -1,6 +1,8 @@
 import path from "path";
-import bls, {initBLS} from "../../src";
 import {describeDirectorySpecTest, InputType} from "@chainsafe/lodestar-spec-test-util";
+import {hexToBytes} from "../../src/helpers";
+import {SPEC_TESTS_DIR} from "../params";
+import {describeForAllImplementations} from "../switch";

 interface IVerifyTestCase {
  data: {
@ -13,24 +15,17 @@ interface IVerifyTestCase {
  };
 }

-before(async function f() {
-  await initBLS();
-});
-
+describeForAllImplementations((bls) => {
  describeDirectorySpecTest<IVerifyTestCase, boolean>(
-  "BLS - verify",
-  path.join(__dirname, "../../node_modules/@chainsafe/eth2-spec-tests/tests/general/phase0/bls/verify/small"),
+    "bls/verify/small",
+    path.join(SPEC_TESTS_DIR, "general/phase0/bls/verify/small"),
    (testCase) => {
-    return bls.verify(
-      Buffer.from(testCase.data.input.pubkey.replace("0x", ""), "hex"),
-      Buffer.from(testCase.data.input.message.replace("0x", ""), "hex"),
-      Buffer.from(testCase.data.input.signature.replace("0x", ""), "hex")
-    );
+      const {pubkey, message, signature} = testCase.data.input;
+      return bls.verify(hexToBytes(pubkey), hexToBytes(message), hexToBytes(signature));
    },
    {
-    inputTypes: {
-      data: InputType.YAML,
-    },
+      inputTypes: {data: InputType.YAML},
      getExpected: (testCase) => testCase.data.output,
    }
  );
+});
--- a/test/switch.ts
+++ b/test/switch.ts
@ -0,0 +1,36 @@
+import blst from "../src/blst";
+import herumi from "../src/herumi";
+import {IBls} from "../src/interface";
+
+export type Implementation = "blst" | "herumi";
+
+// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
+export function getBls(implementation: Implementation): IBls {
+  switch (implementation) {
+    case "blst":
+      return blst;
+    case "herumi":
+      return herumi;
+  }
+}
+
+export async function runForAllImplementations(
+  callback: (bls: IBls, implementation: Implementation) => Promise<void> | void
+): Promise<void> {
+  for (const implementation of ["blst", "herumi"] as Implementation[]) {
+    const bls = getBls(implementation);
+    await callback(bls, implementation);
+  }
+}
+
+export function describeForAllImplementations(callback: (bls: IBls) => void): void {
+  runForAllImplementations((bls, implementation) => {
+    describe(implementation, () => {
+      before(async () => {
+        await bls.init();
+      });
+
+      callback(bls);
+    });
+  });
+}
--- a/test/unit/context.test.ts
+++ b/test/unit/context.test.ts
@ -1,19 +0,0 @@
-import {init, getContext, destroy} from "../../src/context";
-import {expect} from "chai";
-
-describe("bls wasm constext", function () {
-  afterEach(() => {
-    destroy();
-  });
-
-  it("initializes and works", async function () {
-    await init();
-    expect(getContext().getCurveOrder()).to.be.equal(
-      "52435875175126190479447740508185965837690552500527637822603658699938581184513"
-    );
-  });
-
-  it("throws if context not initialized", async function () {
-    expect(() => getContext().getCurveOrder()).to.throw();
-  });
-});
--- a/test/unit/helpers/hex.test.ts
+++ b/test/unit/helpers/hex.test.ts
@ -0,0 +1,29 @@
+import {expect} from "chai";
+import {hexToBytes, bytesToHex} from "../../../src/helpers/hex";
+
+describe("helpers / hex", () => {
+  const testCases: {id: string; hex: string}[] = [
+    {
+      id: "pubkey",
+      hex: "0xb6f21199594b56d77670564bf422cb331d5281ca2c1f9a45588a56881d8287ef8619efa6456d6cd2ef61306aa5b21311",
+    },
+  ];
+
+  for (const {id, hex} of testCases) {
+    it(`${id} hexToBytes`, () => {
+      const expectedBytes = hexToBytesNode(hex);
+      const bytes = hexToBytes(hex);
+      expect(expectedBytes.equals(bytes)).to.be.true;
+    });
+
+    it(`${id} bytesToHex`, () => {
+      const bytes = hexToBytesNode(hex);
+      const _hex = bytesToHex(bytes);
+      expect(_hex).to.equal(hex);
+    });
+  }
+});
+
+function hexToBytesNode(hex: string): Buffer {
+  return Buffer.from(hex.replace("0x", ""), "hex");
+}
--- a/test/unit/index.test.ts
+++ b/test/unit/index.test.ts
@ -1,226 +1,93 @@
-import bls, {aggregatePubkeys, aggregateSignatures, initBLS, Keypair, verify, verifyMultiple} from "../../src";
-import SHA256 from "@chainsafe/as-sha256";
 import {expect} from "chai";
-import {destroy} from "../../src/context";
+import {IBls} from "../../src/interface";
+import {getN, randomMessage} from "../util";

-describe("test bls", function () {
-  before(async function () {
-    await initBLS();
-  });
+export function runIndexTests(bls: IBls): void {
+  // eslint-disable-next-line @typescript-eslint/explicit-function-return-type
+  function getRandomData() {
+    const sk = bls.PrivateKey.fromKeygen();
+    const pk = sk.toPublicKey();
+    const msg = randomMessage();
+    const sig = sk.sign(msg);
+    return {sk, pk, msg, sig};
+  }

-  after(function () {
-    destroy();
-  });
-
-  describe("aggregate pubkey", function () {
-    it("should aggregate empty array", function () {
-      expect(bls.aggregatePubkeys([])).to.not.throw;
-    });
-  });
-
-  describe("verify", function () {
+  describe("verify", () => {
    it("should verify signature", () => {
-      const keypair = Keypair.generate();
-      const messageHash = Buffer.from(SHA256.digest(Buffer.from("Test")));
-      const signature = keypair.privateKey.signMessage(messageHash);
-      const result = verify(keypair.publicKey.toBytesCompressed(), messageHash, signature.toBytesCompressed());
-      expect(result).to.be.true;
-    });
+      const {pk, msg, sig} = getRandomData();
+      const pkHex = pk.toHex();
+      const isValid = bls.verify(pk.toBytes(), msg, sig.toBytes());
+      expect(isValid, "fail verify").to.be.true;

-    it("should not modify original pubkey when verifying", () => {
-      const keypair = Keypair.generate();
-      const messageHash = Buffer.from(SHA256.digest(Buffer.from("Test")));
-      const signature = keypair.privateKey.signMessage(messageHash);
-      const pubKey = keypair.publicKey.toBytesCompressed();
-      verify(pubKey, messageHash, signature.toBytesCompressed());
-      expect("0x" + pubKey.toString("hex")).to.be.equal(keypair.publicKey.toHexString());
+      // Make sure to not modify original pubkey when verifying
+      expect(pk.toHex()).to.be.equal(pkHex, "pubkey modified when verifying");
    });

    it("should fail verify empty signature", () => {
-      const keypair = Keypair.generate();
-      const messageHash2 = Buffer.from(SHA256.digest(Buffer.from("Test message2")));
-      const signature = Buffer.alloc(96);
-      const result = verify(keypair.publicKey.toBytesCompressed(), messageHash2, signature);
-      expect(result).to.be.false;
+      const {pk, msg} = getRandomData();
+      const emptySig = Buffer.alloc(96);
+      const isValid = bls.verify(pk.toBytes(), msg, emptySig);
+      expect(isValid).to.be.false;
    });

    it("should fail verify signature of different message", () => {
-      const keypair = Keypair.generate();
-      const messageHash = Buffer.from(SHA256.digest(Buffer.from("Test message")));
-      const messageHash2 = Buffer.from(SHA256.digest(Buffer.from("Test message2")));
-      const signature = keypair.privateKey.signMessage(messageHash);
-      const result = verify(keypair.publicKey.toBytesCompressed(), messageHash2, signature.toBytesCompressed());
-      expect(result).to.be.false;
+      const {pk, sig} = getRandomData();
+      const msg2 = randomMessage();
+      const isValid = bls.verify(pk.toBytes(), msg2, sig.toBytes());
+      expect(isValid).to.be.false;
    });

    it("should fail verify signature signed by different key", () => {
-      const keypair = Keypair.generate();
-      const keypair2 = Keypair.generate();
-      const messageHash = Buffer.from(SHA256.digest(Buffer.from("Test message")));
-      const signature = keypair.privateKey.signMessage(messageHash);
-      const result = verify(keypair2.publicKey.toBytesCompressed(), messageHash, signature.toBytesCompressed());
-      expect(result).to.be.false;
+      const {msg, sig} = getRandomData();
+      const {pk: pk2} = getRandomData();
+      const isValid = bls.verify(pk2.toBytes(), msg, sig.toBytes());
+      expect(isValid).to.be.false;
    });
  });

-  describe("verify multiple", function () {
-    it("should verify aggregated signatures", function () {
-      this.timeout(5000);
+  describe("verify multiple", () => {
+    it("should verify aggregated signatures", () => {
+      const sks = getN(4, () => bls.PrivateKey.fromKeygen());
+      const msgs = getN(2, () => randomMessage());
+      const pks = sks.map((sk) => sk.toPublicKey());

-      const keypair1 = Keypair.generate();
-      const keypair2 = Keypair.generate();
-      const keypair3 = Keypair.generate();
-      const keypair4 = Keypair.generate();
+      const sigs = [sks[0].sign(msgs[0]), sks[1].sign(msgs[0]), sks[2].sign(msgs[1]), sks[3].sign(msgs[1])];

-      const message1 = Buffer.from(SHA256.digest(Buffer.from("Test1")));
-      const message2 = Buffer.from(SHA256.digest(Buffer.from("Test2")));
+      const aggPubkeys = [
+        bls.aggregatePubkeys([pks[0], pks[1]].map((pk) => pk.toBytes())),
+        bls.aggregatePubkeys([pks[2], pks[3]].map((pk) => pk.toBytes())),
+      ];

-      const signature1 = keypair1.privateKey.signMessage(message1);
-      const signature2 = keypair2.privateKey.signMessage(message1);
-      const signature3 = keypair3.privateKey.signMessage(message2);
-      const signature4 = keypair4.privateKey.signMessage(message2);
+      const aggSig = bls.aggregateSignatures(sigs.map((sig) => sig.toBytes()));

-      const aggregatePubKey12 = aggregatePubkeys([
-        keypair1.publicKey.toBytesCompressed(),
-        keypair2.publicKey.toBytesCompressed(),
-      ]);
-
-      const aggregatePubKey34 = aggregatePubkeys([
-        keypair3.publicKey.toBytesCompressed(),
-        keypair4.publicKey.toBytesCompressed(),
-      ]);
-
-      const aggregateSignature = aggregateSignatures([
-        signature1.toBytesCompressed(),
-        signature2.toBytesCompressed(),
-        signature3.toBytesCompressed(),
-        signature4.toBytesCompressed(),
-      ]);
-
-      const result = verifyMultiple([aggregatePubKey12, aggregatePubKey34], [message1, message2], aggregateSignature);
-
-      expect(result).to.be.true;
+      expect(bls.verifyMultiple(aggPubkeys, msgs, aggSig), "should be valid").to.be.true;
+      expect(bls.verifyMultiple(aggPubkeys.reverse(), msgs, aggSig), "should fail - swaped pubkeys").to.be.false;
    });

-    it("should verify aggregated signatures - same message", function () {
-      this.timeout(5000);
+    it("should verify aggregated signatures - same message", () => {
+      const n = 4;
+      const msg = randomMessage();
+      const sks = getN(n, () => bls.PrivateKey.fromKeygen());
+      const pks = sks.map((sk) => sk.toPublicKey());
+      const sigs = sks.map((sk) => sk.sign(msg));

-      const keypair1 = Keypair.generate();
-      const keypair2 = Keypair.generate();
-      const keypair3 = Keypair.generate();
-      const keypair4 = Keypair.generate();
+      const aggregateSignature = bls.aggregateSignatures(sigs.map((sig) => sig.toBytes()));

-      const message = Buffer.from(SHA256.digest(Buffer.from("Test1")));
-
-      const signature1 = keypair1.privateKey.signMessage(message);
-      const signature2 = keypair2.privateKey.signMessage(message);
-      const signature3 = keypair3.privateKey.signMessage(message);
-      const signature4 = keypair4.privateKey.signMessage(message);
-
-      const aggregateSignature = aggregateSignatures([
-        signature1.toBytesCompressed(),
-        signature2.toBytesCompressed(),
-        signature3.toBytesCompressed(),
-        signature4.toBytesCompressed(),
-      ]);
-
-      const result = verifyMultiple(
-        [
-          keypair1.publicKey.toBytesCompressed(),
-          keypair2.publicKey.toBytesCompressed(),
-          keypair3.publicKey.toBytesCompressed(),
-          keypair4.publicKey.toBytesCompressed(),
-        ],
-        [message, message, message, message],
-        aggregateSignature,
-        true
-      );
-
-      expect(result).to.be.true;
-    });
-
-    it("should fail to verify aggregated signatures - swapped messages", function () {
-      this.timeout(5000);
-
-      const keypair1 = Keypair.generate();
-      const keypair2 = Keypair.generate();
-      const keypair3 = Keypair.generate();
-      const keypair4 = Keypair.generate();
-
-      const message1 = Buffer.from(SHA256.digest(Buffer.from("Test1")));
-      const message2 = Buffer.from(SHA256.digest(Buffer.from("Test2")));
-
-      const signature1 = keypair1.privateKey.signMessage(message1);
-      const signature2 = keypair2.privateKey.signMessage(message1);
-      const signature3 = keypair3.privateKey.signMessage(message2);
-      const signature4 = keypair4.privateKey.signMessage(message2);
-
-      const aggregatePubKey12 = bls.aggregatePubkeys([
-        keypair1.publicKey.toBytesCompressed(),
-        keypair2.publicKey.toBytesCompressed(),
-      ]);
-
-      const aggregatePubKey34 = bls.aggregatePubkeys([
-        keypair3.publicKey.toBytesCompressed(),
-        keypair4.publicKey.toBytesCompressed(),
-      ]);
-
-      const aggregateSignature = bls.aggregateSignatures([
-        signature1.toBytesCompressed(),
-        signature2.toBytesCompressed(),
-        signature3.toBytesCompressed(),
-        signature4.toBytesCompressed(),
-      ]);
-
-      const result = bls.verifyMultiple(
-        [aggregatePubKey12, aggregatePubKey34],
-        [message2, message1],
+      const isValid = bls.verifyMultiple(
+        pks.map((pk) => pk.toBytes()),
+        getN(4, () => msg), // Same message n times
        aggregateSignature
      );
-
-      expect(result).to.be.false;
-    });
-
-    it("should fail to verify aggregated signatures - different pubkeys and messsages", () => {
-      const keypair1 = Keypair.generate();
-      const keypair2 = Keypair.generate();
-      const keypair3 = Keypair.generate();
-      const keypair4 = Keypair.generate();
-
-      const message1 = Buffer.from(SHA256.digest(Buffer.from("Test1")));
-      const message2 = Buffer.from(SHA256.digest(Buffer.from("Test2")));
-
-      const signature1 = keypair1.privateKey.signMessage(message1);
-      const signature2 = keypair2.privateKey.signMessage(message1);
-      const signature3 = keypair3.privateKey.signMessage(message2);
-      const signature4 = keypair4.privateKey.signMessage(message2);
-
-      const aggregatePubKey12 = bls.aggregatePubkeys([
-        keypair1.publicKey.toBytesCompressed(),
-        keypair2.publicKey.toBytesCompressed(),
-      ]);
-
-      const aggregateSignature = bls.aggregateSignatures([
-        signature1.toBytesCompressed(),
-        signature2.toBytesCompressed(),
-        signature3.toBytesCompressed(),
-        signature4.toBytesCompressed(),
-      ]);
-
-      const result = bls.verifyMultiple([aggregatePubKey12], [message2, message1], aggregateSignature);
-
-      expect(result).to.be.false;
+      expect(isValid).to.be.true;
    });

    it("should fail to verify aggregated signatures - no public keys", () => {
-      const signature = Buffer.alloc(96);
+      const sig = Buffer.alloc(96);
+      const msg1 = randomMessage();
+      const msg2 = randomMessage();

-      const message1 = Buffer.from(SHA256.digest(Buffer.from("Test1")));
-      const message2 = Buffer.from(SHA256.digest(Buffer.from("Test2")));
-
-      const result = bls.verifyMultiple([], [message2, message1], signature);
-
-      expect(result).to.be.false;
-    });
+      const isValid = bls.verifyMultiple([], [msg2, msg1], sig);
+      expect(isValid).to.be.false;
    });
  });
+}
--- a/test/unit/keypair.test.ts
+++ b/test/unit/keypair.test.ts
@ -1,32 +0,0 @@
-import {PrivateKey, PublicKey, Keypair} from "../../src";
-import {expect} from "chai";
-import {destroy, init} from "../../src/context";
-
-describe("keypair", function () {
-  before(async function () {
-    await init();
-  });
-
-  after(function () {
-    destroy();
-  });
-
-  it("should create from private and public key", () => {
-    const secret = PrivateKey.random();
-    const secret2 = PrivateKey.random();
-    const publicKey = PublicKey.fromBytes(PublicKey.fromPrivateKey(secret2).toBytesCompressed());
-    const keypair = new Keypair(secret, publicKey);
-    expect(keypair.publicKey).to.be.equal(publicKey);
-    expect(keypair.privateKey).to.be.equal(secret);
-    expect(keypair.privateKey).to.not.be.equal(secret2);
-  });
-
-  it("should create from private", () => {
-    const secret = PrivateKey.random();
-    const publicKey = PublicKey.fromPrivateKey(secret);
-    const keypair = new Keypair(secret);
-    expect(keypair.publicKey.toBytesCompressed().toString("hex")).to.be.equal(
-      publicKey.toBytesCompressed().toString("hex")
-    );
-  });
-});
--- a/test/unit/privateKey.test.ts
+++ b/test/unit/privateKey.test.ts
@ -1,38 +1,26 @@
-import {PrivateKey} from "../../src";
 import {expect} from "chai";
-import {SECRET_KEY_LENGTH} from "../../src/constants";
-import {destroy, init} from "../../src/context";
+import {IBls} from "../../src/interface";

-describe("privateKey", function () {
-  before(async function () {
-    await init();
+export function runPrivateKeyTests(bls: IBls): void {
+  describe("PrivateKey", () => {
+    it("should generate fromKeygen private key", () => {
+      const privateKey1 = bls.PrivateKey.fromKeygen();
+      const privateKey2 = bls.PrivateKey.fromKeygen();
+      expect(privateKey1.toHex()).to.not.be.equal(privateKey2.toHex());
    });

-  after(function () {
-    destroy();
-  });
-
-  it("should generate random private key", function () {
-    const privateKey1 = PrivateKey.random();
-    const privateKey2 = PrivateKey.random();
-    expect(privateKey1.toHexString()).to.not.be.equal(privateKey2.toHexString());
-  });
-
-  it("should export private key to hex string", function () {
    const privateKey = "0x07656fd676da43883d163f49566c72b9cbf0a5a294f26808c807700732456da7";

-    expect(PrivateKey.fromHexString(privateKey).toHexString()).to.be.equal(privateKey);
-
-    const privateKey2 = "07656fd676da43883d163f49566c72b9cbf0a5a294f26808c807700732456da7";
-
-    expect(PrivateKey.fromHexString(privateKey2).toHexString()).to.be.equal(privateKey);
+    it("should export private key to hex string", () => {
+      expect(bls.PrivateKey.fromHex(privateKey).toHex()).to.be.equal(privateKey);
    });

-  it("should export private key to bytes", function () {
-    expect(PrivateKey.random().toBytes().length).to.be.equal(SECRET_KEY_LENGTH);
+    it("should export private key to hex string from non-prefixed hex", () => {
+      expect(bls.PrivateKey.fromHex(privateKey).toHex()).to.be.equal(privateKey);
    });

-  it("should not accept too short private key", function () {
-    expect(() => PrivateKey.fromHexString("0x2123")).to.throw();
+    it("should not accept too short private key", () => {
+      expect(() => bls.PrivateKey.fromHex("0x2123")).to.throw();
    });
  });
+}
--- a/test/unit/publicKey.test.ts
+++ b/test/unit/publicKey.test.ts
@ -1,29 +1,21 @@
-import {destroy, init} from "../../src/context";
-import {PublicKey, PrivateKey} from "../../src";
 import {expect} from "chai";
+import {IBls} from "../../src/interface";

-describe("public key", function () {
-  before(async function f() {
-    await init();
-  });
-
-  after(function () {
-    destroy();
-  });
-
-  it("from hex", function () {
+export function runPublicKeyTests(bls: IBls): void {
+  describe("PublicKey", () => {
    const publicKey =
      "0xb6f21199594b56d77670564bf422cb331d5281ca2c1f9a45588a56881d8287ef8619efa6456d6cd2ef61306aa5b21311";
-    expect(PublicKey.fromHex(publicKey).toHexString()).to.be.equal(publicKey);
+
+    it("should export public key to hex string", () => {
+      expect(bls.PublicKey.fromHex(publicKey).toHex()).to.be.equal(publicKey);
    });

-  it("from bytes", function () {
-    const publicKey =
-      "b6f21199594b56d77670564bf422cb331d5281ca2c1f9a45588a56881d8287ef8619efa6456d6cd2ef61306aa5b21311";
-    expect(PublicKey.fromBytes(Buffer.from(publicKey, "hex")).toHexString()).to.be.equal(`0x${publicKey}`);
+    it("should export public key to hex string from non-prefixed hex", () => {
+      expect(bls.PublicKey.fromHex(publicKey).toHex()).to.be.equal(publicKey);
    });

-  it("from private key", function () {
-    PublicKey.fromPrivateKey(PrivateKey.random());
+    it("from private key", () => {
+      bls.PrivateKey.fromKeygen().toPublicKey();
    });
  });
+}
--- a/test/unit/run-all-implementations.test.ts
+++ b/test/unit/run-all-implementations.test.ts
@ -0,0 +1,13 @@
+import {runPrivateKeyTests} from "./privateKey.test";
+import {runPublicKeyTests} from "./publicKey.test";
+// import {runKeypairTests} from "./keypair.test";
+import {runIndexTests} from "./index.test";
+import {describeForAllImplementations} from "../switch";
+
+// Import test's bls lib lazily to prevent breaking test with Karma
+describeForAllImplementations((bls) => {
+  runPrivateKeyTests(bls);
+  runPublicKeyTests(bls);
+  // runKeypairTests(bls);
+  runIndexTests(bls);
+});
--- a/test/unit/run-web-implementation.test.ts
+++ b/test/unit/run-web-implementation.test.ts
@ -0,0 +1,21 @@
+import herumi from "../../src/herumi";
+import {runPrivateKeyTests} from "./privateKey.test";
+import {runPublicKeyTests} from "./publicKey.test";
+// import {runKeypairTests} from "./keypair.test";
+import {runIndexTests} from "./index.test";
+
+// This file is intended to be compiled and run by Karma
+// Do not import the node.bindings or it will break with:
+// Error: BLST bindings loader should only run in a NodeJS context: process.platform
+describe("herumi", () => {
+  before(async () => {
+    // For consistency with describeForAllImplementations
+    // eslint-disable-next-line import/no-named-as-default-member
+    await herumi.init();
+  });
+
+  runPrivateKeyTests(herumi);
+  runPublicKeyTests(herumi);
+  // runKeypairTests(bls);
+  runIndexTests(herumi);
+});
--- a/test/util.ts
+++ b/test/util.ts
@ -0,0 +1,9 @@
+import {randomBytes} from "../src/helpers";
+
+export function randomMessage(): Uint8Array {
+  return randomBytes(32);
+}
+
+export function getN<T>(n: number, getter: () => T): T[] {
+  return Array.from({length: n}, () => getter());
+}
--- a/tsconfig.json
+++ b/tsconfig.json
@ -4,9 +4,8 @@
    "target": "esnext",
    "module": "commonjs",
    "pretty": true,
-    "lib": [
-      "esnext.bigint"
-    ],
+    "lib": ["esnext.bigint"],
+    "typeRoots": ["./node_modules/@types"],
    "declaration": true,
    "strict": true,
    "strictNullChecks": false,
--- a/yarn.lock
+++ b/yarn.lock