docs: public static PrivateKey readPemPrivateKey(final File file) throws IOException,
  		NoSuchAlgorithmException, InvalidKeySpecException, NoSuchProviderException
  	{
  		final String privateKeyAsString = readPemFileAsBase64(file);
  		final byte[] decoded = new Base64().decode(privateKeyAsString);
  		return readPrivateKey(decoded);
  	}