/**
  * Import a private key
  *
  * Read a PEM formatted private key from stdin and import it into the
  * RSAWalletService. The public key will be automatically extracted and stored
  * together with the private key as a key pair.
  *
  * @param boolean $usedForPasswords If the private key should be used for passwords
  * @return void
  * @see typo3.flow:security:importpublickey
  */
 public function importPrivateKeyCommand($usedForPasswords = false)
 {
     $keyData = '';
     // no file_get_contents here because it does not work on php://stdin
     $fp = fopen('php://stdin', 'rb');
     while (!feof($fp)) {
         $keyData .= fgets($fp, 4096);
     }
     fclose($fp);
     $uuid = $this->rsaWalletService->registerKeyPairFromPrivateKeyString($keyData, $usedForPasswords);
     $this->outputLine('The keypair has been successfully imported. Use the following uuid to refer to it in the RSAWalletService: ' . PHP_EOL . PHP_EOL . $uuid . PHP_EOL);
 }