export function decryptFrom(
  ciphertextWithNonce: Uint8Array,
  senderPublicKey: Uint8Array,
  recipientPrivateKey: Uint8Array
): Uint8Array {
  const [nonce, ciphertext] = splitNonceFromMessage(ciphertextWithNonce);
  const decrypted = nacl.crypto_box_open(ciphertext, nonce, senderPublicKey, recipientPrivateKey);

  return decrypted as Uint8Array;
}

export function encryptFor(
  message: Uint8Array,
  recipientPublicKey: Uint8Array,
  senderPrivateKey: Uint8Array
): Uint8Array {
  const nonce = generateNonce();

  const ciphertext = nacl.crypto_box(message, nonce, recipientPublicKey, senderPrivateKey);

  return concat(nonce, ciphertext);
}

export function generateNonce(): Uint8Array {
  return nacl.crypto_box_random_nonce();
}

export function generateAsymmetricKeys() {
  return nacl.crypto_box_keypair();
}