15 lines
517 B
TypeScript
15 lines
517 B
TypeScript
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/**
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* Client-side msgId helper. Mirrors `@shade/inbox-server/msg-id` but lives
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* in this package so client code doesn't need to import the server bundle.
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*
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* `msgId = lowercase-hex( sha256(ciphertext) )`
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*/
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export async function computeMsgId(ciphertext: Uint8Array): Promise<string> {
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const buf = await globalThis.crypto.subtle.digest(
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'SHA-256',
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ciphertext as unknown as ArrayBuffer,
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);
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const arr = new Uint8Array(buf);
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return Array.from(arr, (b) => b.toString(16).padStart(2, '0')).join('');
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}
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