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1import { compactAddLength, isU8a, stringToU8a, u8aConcat } from '@polkadot/util';
2import { blake2AsU8a } from '../blake2/asU8a.js';
3const HDKD = compactAddLength(stringToU8a('Ed25519HDKD'));
4export function ed25519DeriveHard(seed, chainCode) {
5 if (!isU8a(chainCode) || chainCode.length !== 32) {
6 throw new Error('Invalid chainCode passed to derive');
7 }
8 return blake2AsU8a(u8aConcat(HDKD, seed, chainCode));
9}