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25 lines
839 B
Plaintext
25 lines
839 B
Plaintext
import { isoCrypto } from './iso/index.js';
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/**
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* Generate a suitably random value to be used as an attestation or assertion challenge
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*/
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export async function generateChallenge() {
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/**
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* WebAuthn spec says that 16 bytes is a good minimum:
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*
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* "In order to prevent replay attacks, the challenges MUST contain enough entropy to make
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* guessing them infeasible. Challenges SHOULD therefore be at least 16 bytes long."
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*
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* Just in case, let's double it
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*/
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const challenge = new Uint8Array(32);
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await isoCrypto.getRandomValues(challenge);
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return _generateChallengeInternals.stubThis(challenge);
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}
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/**
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* Make it possible to stub the return value during testing
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* @ignore Don't include this in docs output
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*/
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export const _generateChallengeInternals = {
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stubThis: (value) => value,
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};
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