Java – ECDH + JWE encryption using nimbus-jose and Java 6

I

have a question and I was wondering if you could help me.

I need to create an encrypted JWE with elliptic curves.

I’m using

jre 1.6.0，nimbus-jose-jwt-8.20-jdk6.jar，bcprov-jdk15to18-166.jar。

I have created a keystore and a key pair using the EC algorithm and the elliptic curve P-512. If I sign a JWT with a private key, then I try to verify it with the public key, everything works fine, but in addition to signing, I need encryption to create a JWE that doesn’t see the payload.

The

following exception is thrown when attempting to encrypt a JWE with a public key

Exception in thread "main" java.lang.NoClassDefFoundError: java/util/Objects
at com.nimbusds.jose.jwk.KeyUse.hashCode(KeyUse.java:121)
at java.util.HashMap.put(Unknown Source)
at com.nimbusds.jose.jwk.KeyUseAndOpsConsistency.<clinit>(KeyUseAndOpsConsistency.java:43)
at com.nimbusds.jose.jwk.JWK.<init>(JWK.java:197)
at com.nimbusds.jose.jwk.ECKey.<init>(ECKey.java:706)
at com.nimbusds.jose.jwk.ECKey$Builder.build(ECKey.java:571)
at com.nimbusds.jose.crypto.ECDHEncrypter.encrypt(ECDHEncrypter.java:217)
at com.nimbusds.jose.JWEObject.encrypt(JWEObject.java:370)
at pruebasJwt.inicioJwt.main(inicioJwt.java:373)

This is the code I used to encrypt :

        //encriptar token
        ECPublicKey publicKey = (ECPublicKey) certificadoBean.getPublicKey();
        Payload payload = new Payload(signedJWT2);
        JWEObject jwe = new JWEObject(jweHeader, payload);                              
        jwe.encrypt(new ECDHEncrypter(publicKey)); **This is where the exception occurs**
        String jweString = jwe.serialize();
        
String tokenJwt = signedJWT2.serialize();
        System.err.println(tokenJwt);

I defined the library in the Eclipe classpath.

Although my requirement is a JWE encrypted with an elliptic curve, I have created a test certificate RSA so that I can generate an encrypted JWE with said certificate without any problems.

I also used the > they put in A very simple example page on https://connect2id.com/products/nimbus-jose-jwt/examples/jws-with-ec-signature and it doesn’t work for me either. I got the same exception when creating the key pair.

public class JweEC {

public static void main(String[] args) {
        System.out.println("############ INICIO JWE FIRMADO CON CERTIFICADO CURVA ELIPTICA ##############");
        System.out.println("soporta ES512" + JCASupport.isSupported(JWSAlgorithm.ES512));
        
Proveedor de criptografica
        Provider bc = BouncyCastleProviderSingleton.getInstance();
        Security.addProvider(bc);
        System.out.println("soporta ES512" + JCASupport.isSupported(JWSAlgorithm.ES512));
        try {
            
ECKey ecJWK = new ECKeyGenerator(Curve.P_521)
                    .generate(); **This is where the exception occurs**
                ECKey ecPublicJWK = ecJWK.toPublicJWK();
        }catch (Exception e) {
             TODO: handle exception
        }

}

}

The NoClassDefFoundError exception indicates that the classloader responsible for dynamic class loading could not find the .class file for the class you are trying to use, but as I said earlier, all my libraries are included in the classpath.

Could it be that I missed some Liberia? I don’t know, I’m lost in this issue

The problem is that nimbus-jose-jwt-8.20-jdk6.jar does not support running on Java 6, despite the fact that “jdk6” appears in its name.

The error you see is because KeyUse’s hashCode() method class uses get in contact with Connect2Id and ask them for support.