Function signCookie

http/unstable_signed_cookie.ts:45–53

(
  value: string,
  key: CryptoKey,
)

 * @returns The signed cookie.
 */
export async function signCookie(
  value: string,
  key: CryptoKey,
): Promise<string> {
  const data = encoder.encode(value);
  const signature = await crypto.subtle.sign("HMAC", key, data);
  const signatureHex = encodeHex(signature);
  return `${value}.${signatureHex}`;
}

/**
 * Returns a promise of a boolean indicating whether the signed cookie is valid.