22 lines
1015 B
TypeScript
22 lines
1015 B
TypeScript
/**
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* SeedQR encoding (SeedSigner standard, supported by Passport/Passport Prime,
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* SeedSigner, Keystone, Nunchuk, Sparrow, …): each BIP39 word becomes its
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* zero-padded 4-digit wordlist index (0000–2047), concatenated into one
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* digit stream and rendered as a numeric-mode QR. A 24-word seed is 96
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* digits. Spec: github.com/SeedSigner/seedsigner/blob/main/docs/seed_qr
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*
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* Only valid for real BIP39 mnemonics — LND's aezeed shares the wordlist but
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* is NOT BIP39, and hardware wallets cannot import it; never SeedQR-encode it.
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*/
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export async function toSeedQrDigits(words: string[]): Promise<string | null> {
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if (words.length === 0) return null
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const { wordlist } = await import('@scure/bip39/wordlists/english.js')
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const digits: string[] = []
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for (const raw of words) {
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const idx = wordlist.indexOf(raw.trim().toLowerCase())
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if (idx < 0) return null // not a BIP39 word — caller falls back to text
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digits.push(idx.toString().padStart(4, '0'))
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}
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return digits.join('')
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}
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