为什么 JWS 签名验证失败？

如何解决为什么 JWS 签名验证失败？

我正在尝试使用 Java 中的 Nimbus JOSE JWT 库以分离的有效负载对消息进行签名。验证在本地通过，但每当我尝试使用 Postman 将其发送到服务器时，我都会得到："The signature header x-jws-signature was parsed and has a valid JOSE header that complies with the specification. However,the signature itself Could not be verified"

 JWSSigner signer = new RSASSASigner(privateKey);

        HashMap<String,Object> criticalParameters = new HashMap<>();
        criticalParameters.put("http://openbanking.org.uk/iat",1501497671);
        criticalParameters.put("http://openbanking.org.uk/iss",orgId);
        criticalParameters.put("http://openbanking.org.uk/tan","openbankingtest.org.uk");

        JWSHeader header = new JWSHeader.Builder(JWSAlgorithm.PS256)
                .type(JOSEObjectType.JOSE)
                .keyID(keyID)
                .criticalParams(criticalParameters.keySet())
                .customParams(criticalParameters)
                .build();

        // With encoding the payload
        JWSObject jwsObject = new JWSObject(header,payload);
        jwsObject.sign(signer);

        String jws = jwsObject.serialize(true);


        JWSObject parsedJWSObject = JWSObject.parse(jws,payload);

        if (parsedJWSObject.verify(new RSASSAVerifier(publicKey,criticalParameters.keySet()))) {
            System.out.println(parsedJWSObject.serialize(true));
        } else {
            System.out.println("Invalid");
        }
        //=============================

        // Without encoding the payload
        Base64URL signature = signer.sign(header,(header.toBase64URL().toString() + "." + payload).getBytes());
        JWsverifier verifier = new RSASSAVerifier(publicKey,criticalParameters.keySet());

        boolean isValid = verifier.verify(header,(header.toBase64URL().toString() + "." + payload).getBytes(),signature);
        System.out.println(header.toBase64URL().toString() + ".." + signature.toString());
        System.out.println(isValid);
        //=============================

这两个函数都成功地对 JWS 进行了签名和验证，但由于某种原因，它不起作用。如果有帮助，我正在尝试访问 Open Banking API。