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[samples] fix passkey challenge encoding in frontend sample #569

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Merged
pengying merged 1 commit into from
Jun 18, 2026
Merged

[samples] fix passkey challenge encoding in frontend sample #569

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7 changes: 4 additions & 3 deletions samples/frontend/src/steps/embeddedWallet/AuthenticateAndSign.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -77,12 +77,13 @@ export default function AuthenticateAndSign({
{ clientPublicKey },
)

// 3. WebAuthn assertion against the Grid-issued challenge. The OS shows
// its biometric prompt regardless of whether we send the real
// 3. WebAuthn assertion against the Grid-issued challenge. The challenge
// is a lowercase hex string; UTF-8 encode it exactly as returned. The
// OS shows its biometric prompt regardless of whether we send the real
// signature or the sandbox magic value below.
const assertion = (await navigator.credentials.get({
publicKey: {
challenge: base64urlToBytes(challenge.challenge),
challenge: new TextEncoder().encode(challenge.challenge),
userVerification: 'required',
timeout: 60_000,
},
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