@polkadot/util-crypto/sr25519/derivePublic.js

A collection of useful crypto utilities for @polkadot

import * as sr25519 from '@scure/sr25519';
import { isU8a, u8aToU8a } from '@polkadot/util';
export function sr25519DerivePublic(publicKey, chainCode) {
    const publicKeyU8a = u8aToU8a(publicKey);
    if (!isU8a(chainCode) || chainCode.length !== 32) {
        throw new Error('Invalid chainCode passed to derive');
    }
    else if (publicKeyU8a.length !== 32) {
        throw new Error(`Invalid publicKey, received ${publicKeyU8a.length} bytes, expected 32`);
    }
    return sr25519.HDKD.publicSoft(publicKeyU8a, chainCode);
}