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20 lines
724 B
TypeScript
20 lines
724 B
TypeScript
export const HARDENED_KEY_BITMASK = 0x80000000
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export const GMW_ACCOUNT_DERIVATION_INDEX = 1
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export const AUF_ACCOUNT_DERIVATION_INDEX = 2
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/*
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* change derivation index from x => x'
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* for more infos to hardened keys look here:
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* https://en.bitcoin.it/wiki/BIP_0032
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*/
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export const hardenDerivationIndex = (derivationIndex: number): number => {
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/*
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TypeScript uses signed integers by default,
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but bip32-ed25519 expects an unsigned value for the derivation index.
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The >>> shifts the bits 0 places to the right, which effectively makes no change to the value,
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but forces TypeScript to treat derivationIndex as an unsigned value.
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Source: ChatGPT
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*/
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return (derivationIndex | HARDENED_KEY_BITMASK) >>> 0
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}
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