*Update dist

lib/blst-native/index.d.ts

@@ -0,0 +1,8 @@
+import { SecretKey } from "./secretKey.js";
+import { PublicKey } from "./publicKey.js";
+import { Signature } from "./signature.js";
+import { IBls } from "../types.js";
+export * from "../constants.js";
+export { SecretKey, PublicKey, Signature };
+export declare const bls: IBls;
+export default bls;

lib/blst-native/index.js

@@ -0,0 +1,14 @@
+import { SecretKey } from "./secretKey.js";
+import { PublicKey } from "./publicKey.js";
+import { Signature } from "./signature.js";
+import { functionalInterfaceFactory } from "../functional.js";
+export * from "../constants.js";
+export { SecretKey, PublicKey, Signature };
+export const bls = {
+    implementation: "blst-native",
+    SecretKey,
+    PublicKey,
+    Signature,
+    ...functionalInterfaceFactory({ SecretKey, PublicKey, Signature }),
+};
+export default bls;

lib/blst-native/publicKey.d.ts

@@ -0,0 +1,11 @@
+import * as blst from "@chainsafe/blst";
+import { PointFormat, PublicKey as IPublicKey } from "../types.js";
+export declare class PublicKey extends blst.PublicKey implements IPublicKey {
+    constructor(value: ConstructorParameters<typeof blst.PublicKey>[0]);
+    /** @param type Defaults to `CoordType.jacobian` */
+    static fromBytes(bytes: Uint8Array, type?: blst.CoordType, validate?: boolean): PublicKey;
+    static fromHex(hex: string): PublicKey;
+    static aggregate(publicKeys: PublicKey[]): PublicKey;
+    toBytes(format?: PointFormat): Uint8Array;
+    toHex(format?: PointFormat): string;
+}

lib/blst-native/publicKey.js

@@ -0,0 +1,37 @@
+import * as blst from "@chainsafe/blst";
+import { EmptyAggregateError } from "../errors.js";
+import { bytesToHex, hexToBytes } from "../helpers/index.js";
+import { PointFormat } from "../types.js";
+export class PublicKey extends blst.PublicKey {
+    constructor(value) {
+        super(value);
+    }
+    /** @param type Defaults to `CoordType.jacobian` */
+    static fromBytes(bytes, type, validate) {
+        const pk = blst.PublicKey.fromBytes(bytes, type);
+        if (validate)
+            pk.keyValidate();
+        return new PublicKey(pk.value);
+    }
+    static fromHex(hex) {
+        return this.fromBytes(hexToBytes(hex));
+    }
+    static aggregate(publicKeys) {
+        if (publicKeys.length === 0) {
+            throw new EmptyAggregateError();
+        }
+        const pk = blst.aggregatePubkeys(publicKeys);
+        return new PublicKey(pk.value);
+    }
+    toBytes(format) {
+        if (format === PointFormat.uncompressed) {
+            return this.value.serialize();
+        }
+        else {
+            return this.value.compress();
+        }
+    }
+    toHex(format) {
+        return bytesToHex(this.toBytes(format));
+    }
+}

lib/blst-native/secretKey.d.ts

@@ -0,0 +1,15 @@
+import * as blst from "@chainsafe/blst";
+import { SecretKey as ISecretKey } from "../types.js";
+import { PublicKey } from "./publicKey.js";
+import { Signature } from "./signature.js";
+export declare class SecretKey implements ISecretKey {
+    readonly value: blst.SecretKey;
+    constructor(value: blst.SecretKey);
+    static fromBytes(bytes: Uint8Array): SecretKey;
+    static fromHex(hex: string): SecretKey;
+    static fromKeygen(entropy?: Uint8Array): SecretKey;
+    sign(message: Uint8Array): Signature;
+    toPublicKey(): PublicKey;
+    toBytes(): Uint8Array;
+    toHex(): string;
+}

lib/blst-native/secretKey.js

@@ -0,0 +1,39 @@
+import * as blst from "@chainsafe/blst";
+import { bytesToHex, hexToBytes, isZeroUint8Array, randomBytes } from "../helpers/index.js";
+import { SECRET_KEY_LENGTH } from "../constants.js";
+import { PublicKey } from "./publicKey.js";
+import { Signature } from "./signature.js";
+import { ZeroSecretKeyError } from "../errors.js";
+export class SecretKey {
+    constructor(value) {
+        this.value = value;
+    }
+    static fromBytes(bytes) {
+        // draft-irtf-cfrg-bls-signature-04 does not allow SK == 0
+        if (isZeroUint8Array(bytes)) {
+            throw new ZeroSecretKeyError();
+        }
+        const sk = blst.SecretKey.fromBytes(bytes);
+        return new SecretKey(sk);
+    }
+    static fromHex(hex) {
+        return this.fromBytes(hexToBytes(hex));
+    }
+    static fromKeygen(entropy) {
+        const sk = blst.SecretKey.fromKeygen(entropy || randomBytes(SECRET_KEY_LENGTH));
+        return new SecretKey(sk);
+    }
+    sign(message) {
+        return new Signature(this.value.sign(message).value);
+    }
+    toPublicKey() {
+        const pk = this.value.toPublicKey();
+        return new PublicKey(pk.value);
+    }
+    toBytes() {
+        return this.value.toBytes();
+    }
+    toHex() {
+        return bytesToHex(this.toBytes());
+    }
+}

lib/blst-native/signature.d.ts

@@ -0,0 +1,21 @@
+import * as blst from "@chainsafe/blst";
+import { PointFormat, Signature as ISignature } from "../types.js";
+import { PublicKey } from "./publicKey.js";
+export declare class Signature extends blst.Signature implements ISignature {
+    constructor(value: ConstructorParameters<typeof blst.Signature>[0]);
+    /** @param type Defaults to `CoordType.affine` */
+    static fromBytes(bytes: Uint8Array, type?: blst.CoordType, validate?: boolean): Signature;
+    static fromHex(hex: string): Signature;
+    static aggregate(signatures: Signature[]): Signature;
+    static verifyMultipleSignatures(sets: {
+        publicKey: PublicKey;
+        message: Uint8Array;
+        signature: Signature;
+    }[]): boolean;
+    verify(publicKey: PublicKey, message: Uint8Array): boolean;
+    verifyAggregate(publicKeys: PublicKey[], message: Uint8Array): boolean;
+    verifyMultiple(publicKeys: PublicKey[], messages: Uint8Array[]): boolean;
+    toBytes(format?: PointFormat): Uint8Array;
+    toHex(format?: PointFormat): string;
+    private aggregateVerify;
+}

lib/blst-native/signature.js

@@ -0,0 +1,62 @@
+import * as blst from "@chainsafe/blst";
+import { bytesToHex, hexToBytes } from "../helpers/index.js";
+import { PointFormat } from "../types.js";
+import { EmptyAggregateError, ZeroSignatureError } from "../errors.js";
+export class Signature extends blst.Signature {
+    constructor(value) {
+        super(value);
+    }
+    /** @param type Defaults to `CoordType.affine` */
+    static fromBytes(bytes, type, validate = true) {
+        const sig = blst.Signature.fromBytes(bytes, type);
+        if (validate)
+            sig.sigValidate();
+        return new Signature(sig.value);
+    }
+    static fromHex(hex) {
+        return this.fromBytes(hexToBytes(hex));
+    }
+    static aggregate(signatures) {
+        if (signatures.length === 0) {
+            throw new EmptyAggregateError();
+        }
+        const agg = blst.aggregateSignatures(signatures);
+        return new Signature(agg.value);
+    }
+    static verifyMultipleSignatures(sets) {
+        return blst.verifyMultipleAggregateSignatures(sets.map((s) => ({ msg: s.message, pk: s.publicKey, sig: s.signature })));
+    }
+    verify(publicKey, message) {
+        // Individual infinity signatures are NOT okay. Aggregated signatures MAY be infinity
+        if (this.value.is_inf()) {
+            throw new ZeroSignatureError();
+        }
+        return blst.verify(message, publicKey, this);
+    }
+    verifyAggregate(publicKeys, message) {
+        return blst.fastAggregateVerify(message, publicKeys, this);
+    }
+    verifyMultiple(publicKeys, messages) {
+        return blst.aggregateVerify(messages, publicKeys, this);
+    }
+    toBytes(format) {
+        if (format === PointFormat.uncompressed) {
+            return this.value.serialize();
+        }
+        else {
+            return this.value.compress();
+        }
+    }
+    toHex(format) {
+        return bytesToHex(this.toBytes(format));
+    }
+    aggregateVerify(msgs, pks) {
+        // If this set is simply an infinity signature and infinity publicKey then skip verification.
+        // This has the effect of always declaring that this sig/publicKey combination is valid.
+        // for Eth2.0 specs tests
+        if (this.value.is_inf() && pks.length === 1 && pks[0].value.is_inf()) {
+            return true;
+        }
+        return blst.aggregateVerify(msgs, pks, this);
+    }
+}

lib/constants.d.ts

@@ -0,0 +1,5 @@
+export declare const SECRET_KEY_LENGTH = 32;
+export declare const PUBLIC_KEY_LENGTH_COMPRESSED = 48;
+export declare const PUBLIC_KEY_LENGTH_UNCOMPRESSED: number;
+export declare const SIGNATURE_LENGTH_COMPRESSED = 96;
+export declare const SIGNATURE_LENGTH_UNCOMPRESSED: number;

lib/constants.js

@@ -0,0 +1,5 @@
+export const SECRET_KEY_LENGTH = 32;
+export const PUBLIC_KEY_LENGTH_COMPRESSED = 48;
+export const PUBLIC_KEY_LENGTH_UNCOMPRESSED = 48 * 2;
+export const SIGNATURE_LENGTH_COMPRESSED = 96;
+export const SIGNATURE_LENGTH_UNCOMPRESSED = 96 * 2;

lib/errors.d.ts

@@ -0,0 +1,25 @@
+/**
+ * This error should not be ignored by the functional interface
+ * try / catch blocks, to prevent false negatives
+ */
+export declare class NotInitializedError extends Error {
+    constructor(implementation: string);
+}
+export declare class ZeroSecretKeyError extends Error {
+    constructor();
+}
+export declare class ZeroPublicKeyError extends Error {
+    constructor();
+}
+export declare class ZeroSignatureError extends Error {
+    constructor();
+}
+export declare class EmptyAggregateError extends Error {
+    constructor();
+}
+export declare class InvalidOrderError extends Error {
+    constructor();
+}
+export declare class InvalidLengthError extends Error {
+    constructor(arg: string, length: number);
+}

lib/errors.js

@@ -0,0 +1,39 @@
+/**
+ * This error should not be ignored by the functional interface
+ * try / catch blocks, to prevent false negatives
+ */
+export class NotInitializedError extends Error {
+    constructor(implementation) {
+        super(`NOT_INITIALIZED: ${implementation}`);
+    }
+}
+export class ZeroSecretKeyError extends Error {
+    constructor() {
+        super("ZERO_SECRET_KEY");
+    }
+}
+export class ZeroPublicKeyError extends Error {
+    constructor() {
+        super("ZERO_PUBLIC_KEY");
+    }
+}
+export class ZeroSignatureError extends Error {
+    constructor() {
+        super("ZERO_SIGNATURE");
+    }
+}
+export class EmptyAggregateError extends Error {
+    constructor() {
+        super("EMPTY_AGGREGATE_ARRAY");
+    }
+}
+export class InvalidOrderError extends Error {
+    constructor() {
+        super("INVALID_ORDER");
+    }
+}
+export class InvalidLengthError extends Error {
+    constructor(arg, length) {
+        super(`INVALID_LENGTH: ${arg} - ${length} bytes`);
+    }
+}

lib/functional.d.ts

@@ -0,0 +1,15 @@
+import { IBls } from "./types.js";
+export declare function functionalInterfaceFactory({ SecretKey, PublicKey, Signature, }: Pick<IBls, "SecretKey" | "PublicKey" | "Signature">): {
+    sign: (secretKey: Uint8Array, message: Uint8Array) => Uint8Array;
+    aggregateSignatures: (signatures: Uint8Array[]) => Uint8Array;
+    aggregatePublicKeys: (publicKeys: 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;
+    verifyMultipleSignatures: (sets: {
+        publicKey: Uint8Array;
+        message: Uint8Array;
+        signature: Uint8Array;
+    }[]) => boolean;
+    secretKeyToPublicKey: (secretKey: Uint8Array) => Uint8Array;
+};

lib/functional.js

@@ -0,0 +1,137 @@
+import { validateBytes } from "./helpers/index.js";
+import { NotInitializedError } from "./errors.js";
+// Returned type is enforced at each implementation's index
+// eslint-disable-next-line max-len
+// eslint-disable-next-line @typescript-eslint/explicit-function-return-type,@typescript-eslint/explicit-module-boundary-types
+export function functionalInterfaceFactory({ SecretKey, PublicKey, Signature, }) {
+    /**
+     * Signs given message using secret key.
+     * @param secretKey
+     * @param message
+     */
+    function sign(secretKey, message) {
+        validateBytes(secretKey, "secretKey");
+        validateBytes(message, "message");
+        return SecretKey.fromBytes(secretKey).sign(message).toBytes();
+    }
+    /**
+     * Compines all given signature into one.
+     * @param signatures
+     */
+    function aggregateSignatures(signatures) {
+        const agg = Signature.aggregate(signatures.map((p) => Signature.fromBytes(p)));
+        return agg.toBytes();
+    }
+    /**
+     * Combines all given public keys into single one
+     * @param publicKeys
+     */
+    function aggregatePublicKeys(publicKeys) {
+        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, message, signature) {
+        validateBytes(publicKey, "publicKey");
+        validateBytes(message, "message");
+        validateBytes(signature, "signature");
+        try {
+            return Signature.fromBytes(signature).verify(PublicKey.fromBytes(publicKey), message);
+        }
+        catch (e) {
+            if (e instanceof NotInitializedError)
+                throw e;
+            return false;
+        }
+    }
+    /**
+     * Verifies if aggregated signature is same message signed with given public keys.
+     * @param publicKeys
+     * @param message
+     * @param signature
+     */
+    function verifyAggregate(publicKeys, message, signature) {
+        validateBytes(publicKeys, "publicKey");
+        validateBytes(message, "message");
+        validateBytes(signature, "signature");
+        try {
+            return Signature.fromBytes(signature).verifyAggregate(publicKeys.map((publicKey) => PublicKey.fromBytes(publicKey)), message);
+        }
+        catch (e) {
+            if (e instanceof NotInitializedError)
+                throw 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, messages, signature) {
+        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) {
+            if (e instanceof NotInitializedError)
+                throw e;
+            return false;
+        }
+    }
+    /**
+     * Verifies multiple signatures at once returning true if all valid or false
+     * if at least one is not. Optimization useful when knowing which signature is
+     * wrong is not relevant, i.e. verifying an entire Eth2.0 block.
+     *
+     * This method provides a safe way to do so by multiplying each signature by
+     * a random number so an attacker cannot craft a malicious signature that won't
+     * verify on its own but will if it's added to a specific predictable signature
+     * https://ethresear.ch/t/fast-verification-of-multiple-bls-signatures/5407
+     */
+    function verifyMultipleSignatures(sets) {
+        if (!sets)
+            throw Error("sets is null or undefined");
+        try {
+            return Signature.verifyMultipleSignatures(sets.map((s) => ({
+                publicKey: PublicKey.fromBytes(s.publicKey),
+                message: s.message,
+                signature: Signature.fromBytes(s.signature),
+            })));
+        }
+        catch (e) {
+            if (e instanceof NotInitializedError)
+                throw e;
+            return false;
+        }
+    }
+    /**
+     * Computes a public key from a secret key
+     */
+    function secretKeyToPublicKey(secretKey) {
+        validateBytes(secretKey, "secretKey");
+        return SecretKey.fromBytes(secretKey).toPublicKey().toBytes();
+    }
+    return {
+        sign,
+        aggregateSignatures,
+        aggregatePublicKeys,
+        verify,
+        verifyAggregate,
+        verifyMultiple,
+        verifyMultipleSignatures,
+        secretKeyToPublicKey,
+    };
+}

lib/getImplementation.d.ts

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+import type { IBls, Implementation } from "./types.js";
+export declare function getImplementation(impl?: Implementation): Promise<IBls>;

lib/getImplementation.js

@@ -0,0 +1,17 @@
+// Thanks https://github.com/iliakan/detect-node/blob/master/index.esm.js
+const isNode = Object.prototype.toString.call(typeof process !== "undefined" ? process : 0) === "[object process]";
+export async function getImplementation(impl = "herumi") {
+    switch (impl) {
+        case "herumi": {
+            return await (await import("./herumi/index.js")).bls();
+        }
+        case "blst-native":
+            // Lazy import native bindings to prevent automatically importing binding.node files
+            if (!isNode) {
+                throw Error("blst-native is only supported in NodeJS");
+            }
+            return (await import("./blst-native/index.js")).bls;
+        default:
+            throw new Error(`Unsupported implementation - ${impl}`);
+    }
+}

lib/helpers/hex.d.ts

@@ -0,0 +1,10 @@
+/**
+ * Browser compatible fromHex method
+ * From https://github.com/herumi/bls-eth-wasm/blob/04eedb77aa96e66b4f65a0ab477228adf8090c36/src/bls.js#L62
+ */
+export declare function hexToBytes(hex: string): Uint8Array;
+/**
+ * Browser compatible toHex method
+ * From https://github.com/herumi/bls-eth-wasm/blob/04eedb77aa96e66b4f65a0ab477228adf8090c36/src/bls.js#L50
+ */
+export declare function bytesToHex(bytes: Uint8Array): string;

lib/helpers/hex.js

@@ -0,0 +1,30 @@
+/**
+ * Browser compatible fromHex method
+ * From https://github.com/herumi/bls-eth-wasm/blob/04eedb77aa96e66b4f65a0ab477228adf8090c36/src/bls.js#L62
+ */
+export function hexToBytes(hex) {
+    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) {
+    let s = "";
+    const n = bytes.length;
+    for (let i = 0; i < n; i++) {
+        s += ("0" + bytes[i].toString(16)).slice(-2);
+    }
+    return "0x" + s;
+}

lib/helpers/index.d.ts

@@ -0,0 +1,2 @@
+export * from "./hex.js";
+export * from "./utils.js";

lib/helpers/index.js

@@ -0,0 +1,2 @@
+export * from "./hex.js";
+export * from "./utils.js";

lib/helpers/utils.d.ts

@@ -0,0 +1,8 @@
+import randomBytes from "randombytes";
+export { randomBytes };
+/**
+ * Validate bytes to prevent confusing WASM errors downstream if bytes is null
+ */
+export declare function validateBytes(bytes: Uint8Array | Uint8Array[] | null, argName?: string): asserts bytes is NonNullable<typeof bytes>;
+export declare function isZeroUint8Array(bytes: Uint8Array): boolean;
+export declare function concatUint8Arrays(bytesArr: Uint8Array[]): Uint8Array;

lib/helpers/utils.js

@@ -0,0 +1,26 @@
+import randomBytes from "randombytes";
+// Single import to ease changing this lib if necessary
+export { randomBytes };
+/**
+ * Validate bytes to prevent confusing WASM errors downstream if bytes is null
+ */
+export function validateBytes(bytes, argName) {
+    for (const item of Array.isArray(bytes) ? bytes : [bytes]) {
+        if (item == null) {
+            throw Error(`${argName || "bytes"} is null or undefined`);
+        }
+    }
+}
+export function isZeroUint8Array(bytes) {
+    return bytes.every((byte) => byte === 0);
+}
+export function concatUint8Arrays(bytesArr) {
+    const totalLen = bytesArr.reduce((total, bytes) => total + bytes.length, 0);
+    const merged = new Uint8Array(totalLen);
+    let mergedLen = 0;
+    for (const bytes of bytesArr) {
+        merged.set(bytes, mergedLen);
+        mergedLen += bytes.length;
+    }
+    return merged;
+}

lib/herumi/context.d.ts

@@ -0,0 +1,12 @@
+import bls from "bls-eth-wasm";
+declare type Bls = typeof bls;
+declare global {
+    interface Window {
+        msCrypto: typeof window["crypto"];
+    }
+}
+export declare function setupBls(): Promise<void>;
+export declare function init(): Promise<void>;
+export declare function destroy(): void;
+export declare function getContext(): Bls;
+export {};

lib/herumi/context.js

@@ -0,0 +1,35 @@
+/* eslint-disable require-atomic-updates */
+import bls from "bls-eth-wasm";
+import { NotInitializedError } from "../errors.js";
+let blsGlobal = null;
+let blsGlobalPromise = null;
+export async function setupBls() {
+    if (!blsGlobal) {
+        await bls.init(bls.BLS12_381);
+        // Patch to fix multiVerify() calls on a browser with polyfilled NodeJS crypto
+        if (typeof window === "object") {
+            const crypto = window.crypto || window.msCrypto;
+            // getRandomValues is not typed in `bls-eth-wasm` because it's not meant to be exposed
+            // @ts-ignore
+            bls.getRandomValues = (x) => crypto.getRandomValues(x);
+        }
+        blsGlobal = bls;
+    }
+}
+// Cache a promise for Bls instead of Bls to make sure it is initialized only once
+export async function init() {
+    if (!blsGlobalPromise) {
+        blsGlobalPromise = setupBls();
+    }
+    return blsGlobalPromise;
+}
+export function destroy() {
+    blsGlobal = null;
+    blsGlobalPromise = null;
+}
+export function getContext() {
+    if (!blsGlobal) {
+        throw new NotInitializedError("herumi");
+    }
+    return blsGlobal;
+}

lib/herumi/index.d.ts

@@ -0,0 +1,9 @@
+import { SecretKey } from "./secretKey.js";
+import { PublicKey } from "./publicKey.js";
+import { Signature } from "./signature.js";
+import { init, destroy } from "./context.js";
+import { IBls } from "../types.js";
+export * from "../constants.js";
+export { SecretKey, PublicKey, Signature, init, destroy };
+export declare const bls: () => Promise<IBls>;
+export default bls;

lib/herumi/index.js

@@ -0,0 +1,18 @@
+import { SecretKey } from "./secretKey.js";
+import { PublicKey } from "./publicKey.js";
+import { Signature } from "./signature.js";
+import { init, destroy } from "./context.js";
+import { functionalInterfaceFactory } from "../functional.js";
+export * from "../constants.js";
+export { SecretKey, PublicKey, Signature, init, destroy };
+export const bls = async () => {
+    await init();
+    return {
+        implementation: "herumi",
+        SecretKey,
+        PublicKey,
+        Signature,
+        ...functionalInterfaceFactory({ SecretKey, PublicKey, Signature }),
+    };
+};
+export default bls;

lib/herumi/publicKey.d.ts

@@ -0,0 +1,11 @@
+import type { PublicKeyType } from "bls-eth-wasm";
+import { PointFormat, PublicKey as IPublicKey } from "../types.js";
+export declare class PublicKey implements IPublicKey {
+    readonly value: PublicKeyType;
+    constructor(value: PublicKeyType);
+    static fromBytes(bytes: Uint8Array): PublicKey;
+    static fromHex(hex: string): PublicKey;
+    static aggregate(publicKeys: PublicKey[]): PublicKey;
+    toBytes(format?: PointFormat): Uint8Array;
+    toHex(format?: PointFormat): string;
+}

lib/herumi/publicKey.js

@@ -0,0 +1,53 @@
+import { getContext } from "./context.js";
+import { bytesToHex, hexToBytes, isZeroUint8Array } from "../helpers/index.js";
+import { PointFormat } from "../types.js";
+import { EmptyAggregateError, InvalidLengthError, ZeroPublicKeyError } from "../errors.js";
+import { PUBLIC_KEY_LENGTH_COMPRESSED, PUBLIC_KEY_LENGTH_UNCOMPRESSED } from "../constants.js";
+export class PublicKey {
+    constructor(value) {
+        if (value.isZero()) {
+            throw new ZeroPublicKeyError();
+        }
+        this.value = value;
+    }
+    static fromBytes(bytes) {
+        const context = getContext();
+        const publicKey = new context.PublicKey();
+        if (!isZeroUint8Array(bytes)) {
+            if (bytes.length === PUBLIC_KEY_LENGTH_COMPRESSED) {
+                publicKey.deserialize(bytes);
+            }
+            else if (bytes.length === PUBLIC_KEY_LENGTH_UNCOMPRESSED) {
+                publicKey.deserializeUncompressed(bytes);
+            }
+            else {
+                throw new InvalidLengthError("PublicKey", bytes.length);
+            }
+        }
+        return new PublicKey(publicKey);
+    }
+    static fromHex(hex) {
+        return this.fromBytes(hexToBytes(hex));
+    }
+    static aggregate(publicKeys) {
+        if (publicKeys.length === 0) {
+            throw new EmptyAggregateError();
+        }
+        const agg = new PublicKey(publicKeys[0].value.clone());
+        for (const pk of publicKeys.slice(1)) {
+            agg.value.add(pk.value);
+        }
+        return agg;
+    }
+    toBytes(format) {
+        if (format === PointFormat.uncompressed) {
+            return this.value.serializeUncompressed();
+        }
+        else {
+            return this.value.serialize();
+        }
+    }
+    toHex(format) {
+        return bytesToHex(this.toBytes(format));
+    }
+}

lib/herumi/secretKey.d.ts

@@ -0,0 +1,15 @@
+import type { SecretKeyType } from "bls-eth-wasm";
+import { PublicKey } from "./publicKey.js";
+import { Signature } from "./signature.js";
+import { SecretKey as ISecretKey } from "../types.js";
+export declare class SecretKey implements ISecretKey {
+    readonly value: SecretKeyType;
+    constructor(value: SecretKeyType);
+    static fromBytes(bytes: Uint8Array): SecretKey;
+    static fromHex(hex: string): SecretKey;
+    static fromKeygen(entropy?: Uint8Array): SecretKey;
+    sign(message: Uint8Array): Signature;
+    toPublicKey(): PublicKey;
+    toBytes(): Uint8Array;
+    toHex(): string;
+}

lib/herumi/secretKey.js

@@ -0,0 +1,43 @@
+import { generateRandomSecretKey } from "@chainsafe/bls-keygen";
+import { SECRET_KEY_LENGTH } from "../constants.js";
+import { getContext } from "./context.js";
+import { PublicKey } from "./publicKey.js";
+import { Signature } from "./signature.js";
+import { bytesToHex, hexToBytes } from "../helpers/index.js";
+import { InvalidLengthError, ZeroSecretKeyError } from "../errors.js";
+export class SecretKey {
+    constructor(value) {
+        if (value.isZero()) {
+            throw new ZeroSecretKeyError();
+        }
+        this.value = value;
+    }
+    static fromBytes(bytes) {
+        if (bytes.length !== SECRET_KEY_LENGTH) {
+            throw new InvalidLengthError("SecretKey", SECRET_KEY_LENGTH);
+        }
+        const context = getContext();
+        const secretKey = new context.SecretKey();
+        secretKey.deserialize(bytes);
+        return new SecretKey(secretKey);
+    }
+    static fromHex(hex) {
+        return this.fromBytes(hexToBytes(hex));
+    }
+    static fromKeygen(entropy) {
+        const sk = generateRandomSecretKey(entropy);
+        return this.fromBytes(sk);
+    }
+    sign(message) {
+        return new Signature(this.value.sign(message));
+    }
+    toPublicKey() {
+        return new PublicKey(this.value.getPublicKey());
+    }
+    toBytes() {
+        return this.value.serialize();
+    }
+    toHex() {
+        return bytesToHex(this.toBytes());
+    }
+}

lib/herumi/signature.d.ts

@@ -0,0 +1,24 @@
+import type { SignatureType } from "bls-eth-wasm";
+import { PublicKey } from "./publicKey.js";
+import { PointFormat, Signature as ISignature, CoordType } from "../types.js";
+export declare class Signature implements ISignature {
+    readonly value: SignatureType;
+    constructor(value: SignatureType);
+    /**
+     * @param type Does not affect `herumi` implementation, always de-serializes to `jacobian`
+     * @param validate With `herumi` implementation signature validation is always on regardless of this flag.
+     */
+    static fromBytes(bytes: Uint8Array, _type?: CoordType, _validate?: boolean): Signature;
+    static fromHex(hex: string): Signature;
+    static aggregate(signatures: Signature[]): Signature;
+    static verifyMultipleSignatures(sets: {
+        publicKey: PublicKey;
+        message: Uint8Array;
+        signature: Signature;
+    }[]): boolean;
+    verify(publicKey: PublicKey, message: Uint8Array): boolean;
+    verifyAggregate(publicKeys: PublicKey[], message: Uint8Array): boolean;
+    verifyMultiple(publicKeys: PublicKey[], messages: Uint8Array[]): boolean;
+    toBytes(format?: PointFormat): Uint8Array;
+    toHex(format?: PointFormat): string;
+}

lib/herumi/signature.js

@@ -0,0 +1,70 @@
+import { getContext } from "./context.js";
+import { bytesToHex, concatUint8Arrays, hexToBytes, isZeroUint8Array } from "../helpers/index.js";
+import { PointFormat } from "../types.js";
+import { EmptyAggregateError, InvalidLengthError, InvalidOrderError } from "../errors.js";
+import { SIGNATURE_LENGTH_COMPRESSED, SIGNATURE_LENGTH_UNCOMPRESSED } from "../constants.js";
+export class Signature {
+    constructor(value) {
+        if (!value.isValidOrder()) {
+            throw new InvalidOrderError();
+        }
+        this.value = value;
+    }
+    /**
+     * @param type Does not affect `herumi` implementation, always de-serializes to `jacobian`
+     * @param validate With `herumi` implementation signature validation is always on regardless of this flag.
+     */
+    static fromBytes(bytes, _type, _validate = true) {
+        const context = getContext();
+        const signature = new context.Signature();
+        if (!isZeroUint8Array(bytes)) {
+            if (bytes.length === SIGNATURE_LENGTH_COMPRESSED) {
+                signature.deserialize(bytes);
+            }
+            else if (bytes.length === SIGNATURE_LENGTH_UNCOMPRESSED) {
+                signature.deserializeUncompressed(bytes);
+            }
+            else {
+                throw new InvalidLengthError("Signature", bytes.length);
+            }
+            signature.deserialize(bytes);
+        }
+        return new Signature(signature);
+    }
+    static fromHex(hex) {
+        return this.fromBytes(hexToBytes(hex));
+    }
+    static aggregate(signatures) {
+        if (signatures.length === 0) {
+            throw new EmptyAggregateError();
+        }
+        const context = getContext();
+        const signature = new context.Signature();
+        signature.aggregate(signatures.map((sig) => sig.value));
+        return new Signature(signature);
+    }
+    static verifyMultipleSignatures(sets) {
+        const context = getContext();
+        return context.multiVerify(sets.map((s) => s.publicKey.value), sets.map((s) => s.signature.value), sets.map((s) => s.message));
+    }
+    verify(publicKey, message) {
+        return publicKey.value.verify(this.value, message);
+    }
+    verifyAggregate(publicKeys, message) {
+        return this.value.fastAggregateVerify(publicKeys.map((key) => key.value), message);
+    }
+    verifyMultiple(publicKeys, messages) {
+        return this.value.aggregateVerifyNoCheck(publicKeys.map((key) => key.value), concatUint8Arrays(messages));
+    }
+    toBytes(format) {
+        if (format === PointFormat.uncompressed) {
+            return this.value.serializeUncompressed();
+        }
+        else {
+            return this.value.serialize();
+        }
+    }
+    toHex(format) {
+        return bytesToHex(this.toBytes(format));
+    }
+}

lib/herumi/web.d.ts

@@ -0,0 +1 @@
+export {};

lib/herumi/web.js

@@ -0,0 +1,6 @@
+import { bls } from "./index.js";
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+(function (window) {
+    window.bls = bls;
+    // @ts-ignore
+})(window);

lib/index.d.ts

@@ -0,0 +1,3 @@
+import type { IBls } from "./types.js";
+export declare const bls: () => Promise<IBls>;
+export default bls;

lib/index.js

@@ -0,0 +1,14 @@
+import { getImplementation } from "./getImplementation.js";
+// Thanks https://github.com/iliakan/detect-node/blob/master/index.esm.js
+const isNode = Object.prototype.toString.call(typeof process !== "undefined" ? process : 0) === "[object process]";
+export const bls = async () => {
+    let bls;
+    try {
+        bls = await getImplementation(isNode ? "blst-native" : "herumi");
+    }
+    catch (e) {
+        bls = await getImplementation("herumi");
+    }
+    return bls;
+};
+export default bls;

lib/switchable.d.ts

@@ -0,0 +1,4 @@
+import type { IBls, Implementation } from "./types.js";
+declare const bls: IBls;
+export default bls;
+export declare function init(impl: Implementation): Promise<void>;

lib/switchable.js

@@ -0,0 +1,11 @@
+import { getImplementation } from "./getImplementation.js";
+// TODO: Use a Proxy for example to throw an error if it's not initialized yet
+const bls = {};
+export default bls;
+export async function init(impl) {
+    // Using Object.assign instead of just bls = getImplementation()
+    // because otherwise the default import breaks. The reference is lost
+    // and the imported object is still undefined after calling init()
+    const blsImpl = await getImplementation(impl);
+    Object.assign(bls, blsImpl);
+}

lib/types.d.ts

@@ -0,0 +1,66 @@
+export interface IBls {
+    implementation: Implementation;
+    SecretKey: typeof SecretKey;
+    PublicKey: typeof PublicKey;
+    Signature: typeof Signature;
+    sign(secretKey: Uint8Array, message: Uint8Array): Uint8Array;
+    aggregatePublicKeys(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;
+    verifyMultipleSignatures(sets: {
+        publicKey: Uint8Array;
+        message: Uint8Array;
+        signature: Uint8Array;
+    }[]): boolean;
+    secretKeyToPublicKey(secretKey: Uint8Array): Uint8Array;
+}
+export declare class SecretKey {
+    private constructor();
+    static fromBytes(bytes: Uint8Array): SecretKey;
+    static fromHex(hex: string): SecretKey;
+    static fromKeygen(entropy?: Uint8Array): SecretKey;
+    sign(message: Uint8Array): Signature;
+    toPublicKey(): PublicKey;
+    toBytes(): Uint8Array;
+    toHex(): string;
+}
+export declare class PublicKey {
+    private constructor();
+    /** @param type Only for impl `blst-native`. Defaults to `CoordType.jacobian` */
+    static fromBytes(bytes: Uint8Array, type?: CoordType, validate?: boolean): PublicKey;
+    static fromHex(hex: string): PublicKey;
+    static aggregate(publicKeys: PublicKey[]): PublicKey;
+    /** @param format Defaults to `PointFormat.compressed` */
+    toBytes(format?: PointFormat): Uint8Array;
+    toHex(format?: PointFormat): string;
+}
+export declare class Signature {
+    private constructor();
+    /** @param type Only for impl `blst-native`. Defaults to `CoordType.affine`
+     *  @param validate When using `herumi` implementation, signature validation is always on regardless of this flag. */
+    static fromBytes(bytes: Uint8Array, type?: CoordType, validate?: boolean): Signature;
+    static fromHex(hex: string): Signature;
+    static aggregate(signatures: Signature[]): Signature;
+    static verifyMultipleSignatures(sets: {
+        publicKey: PublicKey;
+        message: Uint8Array;
+        signature: Signature;
+    }[]): boolean;
+    verify(publicKey: PublicKey, message: Uint8Array): boolean;
+    verifyAggregate(publicKeys: PublicKey[], message: Uint8Array): boolean;
+    verifyMultiple(publicKeys: PublicKey[], messages: Uint8Array[]): boolean;
+    /** @param format Defaults to `PointFormat.compressed` */
+    toBytes(format?: PointFormat): Uint8Array;
+    toHex(format?: PointFormat): string;
+}
+export declare type Implementation = "herumi" | "blst-native";
+export declare enum PointFormat {
+    compressed = "compressed",
+    uncompressed = "uncompressed"
+}
+export declare enum CoordType {
+    affine = 0,
+    jacobian = 1
+}

lib/types.js

@@ -0,0 +1,10 @@
+export var PointFormat;
+(function (PointFormat) {
+    PointFormat["compressed"] = "compressed";
+    PointFormat["uncompressed"] = "uncompressed";
+})(PointFormat || (PointFormat = {}));
+export var CoordType;
+(function (CoordType) {
+    CoordType[CoordType["affine"] = 0] = "affine";
+    CoordType[CoordType["jacobian"] = 1] = "jacobian";
+})(CoordType || (CoordType = {}));

src/getImplementation.ts

@@ -6,7 +6,7 @@ const isNode = Object.prototype.toString.call(typeof process !== "undefined" ? p
 export async function getImplementation(impl: Implementation = "herumi"): Promise<IBls> {
   switch (impl) {
     case "herumi": {
-      return (await import("./herumi/index.js")).bls;
+      return await (await import("./herumi/index.js")).bls();
     }
 
     case "blst-native":

src/herumi/index.ts

@@ -5,19 +5,19 @@ import {init, destroy} from "./context.js";
 import {IBls} from "../types.js";
 import {functionalInterfaceFactory} from "../functional.js";
 
-await init();
-
 export * from "../constants.js";
 
 export {SecretKey, PublicKey, Signature, init, destroy};
 
-export const bls: IBls = {
-  implementation: "herumi",
-  SecretKey,
-  PublicKey,
-  Signature,
+export const bls = async (): Promise<IBls> => {
+  await init();
+  return {
+    implementation: "herumi",
+    SecretKey,
+    PublicKey,
+    Signature,
 
-  ...functionalInterfaceFactory({SecretKey, PublicKey, Signature}),
+    ...functionalInterfaceFactory({SecretKey, PublicKey, Signature}),
+  };
 };
-
 export default bls;

src/index.ts

@@ -4,11 +4,16 @@ import {getImplementation} from "./getImplementation.js";
 // Thanks https://github.com/iliakan/detect-node/blob/master/index.esm.js
 const isNode = Object.prototype.toString.call(typeof process !== "undefined" ? process : 0) === "[object process]";
 
-let bls: IBls;
-try {
-  bls = await getImplementation(isNode ? "blst-native" : "herumi");
-} catch (e) {
-  bls = await getImplementation("herumi");
-}
+export const bls = async (): Promise<IBls> => {
+  let bls: IBls;
+
+  try {
+    bls = await getImplementation(isNode ? "blst-native" : "herumi");
+  } catch (e) {
+    bls = await getImplementation("herumi");
+  }
+
+  return bls;
+};
 
 export default bls;