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export function encryptData(  key: CryptoKey,  plaintext: string,) {  const data = new TextEncoder().encode(plaintext);  return crypto.subtle.encrypt(    { name: key.algorithm.name, iv: new Uint8Array(12) },    key,    data,  ).then((encryptedData) => {    return btoa(      String.fromCharCode(...new Uint8Array(encryptedData)),    );  });}