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我需要一些帮助来验证带有 ECDSA 公钥的 jwt 签名。我正在从带有充气城堡的 .pem 文件中读取密钥并使用 jjwt 进行验证。验证签名时出现错误。

Security.addProvider(new BouncyCastleProvider());
String jwt = "eyJ0eXAiOiJKV1QiLCJhbGciOiJFUzI1NiJ9.eyJtc2kiOiI5NzE1NTA5ODc2NTUiLCJmZWEiOiJzaWdudXAtZGF0YSIsImlzcyI6IkNEUCIsImV4cCI6MTU1NDU2NjMzNiwiaWF0IjoxNTU0MzkzNTM2LCJzaWQiOiIwNDI0MDMwMDg5NzI4MTg3QG5haS5lcGMubW5jMTMwLm1jYzMxMC4zZ3BwbmV0d29yay5vcmcifQ.RwxoGmFd1_dQPeGN-0gnWIW79xXvGHoyJKBbCKajgO75UooceS6tskxwqViEuP1gZD66UE8Bd2L0FaeI2aS_IA";
PemReader pemReader = new PemReader(new FileReader("/publickey.pem"));
X509EncodedKeySpec spec = new X509EncodedKeySpec(pemReader.readPemObject().getContent());
KeyFactory kf = KeyFactory.getInstance("ECDSA","BC");
PublicKey publicKey = kf.generatePublic(spec);
Jws<Claims> claims = Jwts.parser().setSigningKey(publicKey).parseClaimsJws(jwt);

我收到签名异常：无法使用配置的 ECPublicKey 验证椭圆曲线签名。错误解码签名字节。