| 1 | import { compactAddLength, isU8a, stringToU8a, u8aConcat } from '@polkadot/util';
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| 2 | import { blake2AsU8a } from '../blake2/asU8a.js';
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| 3 | const HDKD = compactAddLength(stringToU8a('Secp256k1HDKD'));
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| 4 | export function secp256k1DeriveHard(seed, chainCode) {
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| 5 | if (!isU8a(chainCode) || chainCode.length !== 32) {
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| 6 | throw new Error('Invalid chainCode passed to derive');
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| 7 | }
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| 8 | // NOTE This is specific to the Substrate HDD derivation, so always use the blake2 hasher
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| 9 | return blake2AsU8a(u8aConcat(HDKD, seed, chainCode), 256);
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| 10 | }
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