public static byte[] readPem(InputStream keyStream) {
		final PemObject pemObject = readPemObject(keyStream);
		if (null != pemObject) {
			return pemObject.getContent();
		}
		return null;
	}
@Test
	@Disabled
	public void readECPrivateKeyTest2() {
		// https://gitee.com/dromara/hutool/issues/I37Z75
		final byte[] d = PemUtil.readPem(FileUtil.getInputStream("d:/test/keys/priv.key"));
		final byte[] publicKey = PemUtil.readPem(FileUtil.getInputStream("d:/test/keys/pub.key"));

		final SM2 sm2 = new SM2(d, publicKey);
		sm2.usePlainEncoding();

		final String content = "我是Hanley.";
		final byte[] sign = sm2.sign(StrUtil.utf8Bytes(content));
		final boolean verify = sm2.verify(StrUtil.utf8Bytes(content), sign);
		assertTrue(verify);
	}