docs: final byte[] cryptoAsym(final byte[] input, final int offset, final int len, final boolean decrypt)
  			throws InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException,
  			BadPaddingException {
  		rsaCipher.init(decrypt ? Cipher.DECRYPT_MODE : Cipher.ENCRYPT_MODE, decrypt ? rsaKeyForDecrypt
  				: rsaKeyForEncrypt);
  		return rsaCipher.doFinal(input, offset, len);
  	}