java - 嵌套的JSON JWT nimbus-jose -jwt库

我正在尝试按照此处提供的示例创建嵌套的json JWT
http://connect2id.com/products/nimbus-jose-jwt/examples/signed-and-encrypted-jwt

import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

import com.nimbusds.jose.*;
import com.nimbusds.jose.crypto.*;
import com.nimbusds.jwt.*;


    // Generate 256-bit AES key for HMAC as well as encryption
    KeyGenerator keyGen = KeyGenerator.getInstance("AES");
    keyGen.init(256);
    SecretKey secretKey = keyGen.generateKey();

    // Create HMAC signer
    JWSSigner signer = new MACSigner(secretKey.getEncoded());

    // Prepare JWT with claims set
    JWTClaimsSet claimsSet = new JWTClaimsSet();
    claimsSet.setSubject("alice");
    claimsSet.setIssueTime(new Date());
    claimsSet.setIssuer("https://c2id.com");

    SignedJWT signedJWT = new SignedJWT(new JWSHeader(JWSAlgorithm.HS256), claimsSet);

    // Apply the HMAC
    signedJWT.sign(signer);

    // Create JWE object with signed JWT as payload
    JWEObject jweObject = new JWEObject(
        new JWEHeader.Builder(JWEAlgorithm.DIR, EncryptionMethod.A256GCM)
            .contentType("JWT") // required to signal nested JWT
            .build(),
        new Payload(signedJWT));

    // Perform encryption
    jweObject.encrypt(new DirectEncrypter(secretKey.getEncoded()));

    // Serialise to JWE compact form
    String jweString = jweObject.serialize();

我产生的结果jweString的问题未正确解决

eyJhbGc.
.6Ne
.tw8z

我得到的是4个而不是3个，有一个空的部分

 eyJhbGc.
           .6Ne

最佳答案

JWE的一般格式有五个部分，<Header>.<EncryptedKey>.<InitializationVector>.<Ciphertext>.<AuthenticationTag>。在某些情况下，例如使用示例中的直接加密，则没有加密密钥，而该部分将保留为空。因此，您应该获得一个包含五个部分的JWE，其中一个部分为空，看起来像eyJjdHkiOiJKV1QiLCJlbmMiOiJBMjU2R0NNIiwiYWxnIjoiZGlyIn0..PVEd_V4E8qyppt6u.UOLp2qTNMw3iA9tyTEDHeJAdTczzI5uP4BkXHQSC6U73kywATBbvdWqz9nilsSWr1y-E1duTMvRL7hzDyyWPMZnpfnCWsjhzZtTnd22HODMWUpU.CoQq987RvHGIN5D6HhrjiQ