### Question:
Jwt { public static boolean verifySHA256withRSA(PublicKey publicKey, ByteBuf token) { return doVerify("SHA256withRSA", publicKey, token); }  static ByteBuf header(ByteBuf token); static ByteBuf payload(ByteBuf token); static ByteBuf signature(ByteBuf token); static ByteBuf headerAndPayload(ByteBuf token); static boolean verifySHA256withRSA(PublicKey publicKey, ByteBuf token); static boolean verify(String alg, PublicKey publicKey, ByteBuf token); static long parseAccessKey(ByteBuf token, Set<String> mappedFields); static String parseAlgorithm(ByteBuf token);  }### Answer:
@Test public void testVerifySHA256withRSA() throws Exception { InputStream is = ClassLoader.getSystemClassLoader().getResourceAsStream("rsocket_broker_public_key.der"); ByteBuf buf = Unpooled.buffer(); int b; while ((b = is.read()) != -1) { buf.writeByte(b); } byte[] keyBytes = new byte[buf.readableBytes()]; buf.readBytes(keyBytes); X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes); RSAPublicKey publicKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(spec); boolean valid = Jwt.verifySHA256withRSA(publicKey, JWT); Assert.assertTrue(valid); }