export async function main() {

  const keys = await window.crypto.subtle.generateKey(

    {

      name: "RSA-PSS",

      modulusLength: 1024,

      publicExponent: new Uint8Array([1, 0, 1]),

      hash: "SHA-256",

    },

    true,

    ["sign", "verify"],

  );

  return {

    private: await exportKey(keys.privateKey, true),

    public: await exportKey(keys.publicKey, false),

  };

}

async function exportKey(key: CryptoKey, isPrivateKey: boolean) {

  const exported = await window.crypto.subtle.exportKey(

    isPrivateKey ? "pkcs8" : "spki",

    key,

  );

  const exportedAsString = ab2str(exported);

  const exportedAsBase64 = window.btoa(exportedAsString);

  const pemExported = `-----BEGIN ${

    isPrivateKey ? "PRIVATE" : "PUBLIC"

  } KEY-----\n${exportedAsBase64}\n-----END PRIVATE KEY-----`;

  return pemExported;

}

function ab2str(buf: ArrayBuffer) {

  return String.fromCharCode.apply(null, new Uint8Array(buf));

}