Good afternoon.

I have an APEX application that receives a token.
This token has been created in JAVA with the nimbus JOSE library.

It is first signed with the following method:

 public static String signer(final String signerKey, final Payload payload) throws JOSEException, ParseException {
  JWSObject jwsObject = new JWSObject(new JWSHeader(JWSAlgorithm.HS256), payload);
  final OctetSequenceKey keySigner = OctetSequenceKey.parse(signerKey);
  JWSSigner jwssigner = new MACSigner(keySigner);  
  jwsObject.sign(jwssigner);
  return jwsObject.serialize();
 }

It is subsequently encrypted with the following method:

 public static String encrypt(final String PayloadString, final String cypherKey) throws ParseException, JOSEException {
  final Payload payload = new Payload(PayloadString);
  final JWEObject jweObject = new JWEObject(new JWEHeader.Builder(JWEAlgorithm.DIR, EncryptionMethod.A128CBC_HS256)
    .contentType("JWT").compressionAlgorithm(CompressionAlgorithm.DEF).build(), payload);
  final OctetSequenceKey keyEncrypter = OctetSequenceKey.parse(cypherKey);
  final JWEEncrypter jweEncrypter = new DirectEncrypter(keyEncrypter);
  jweObject.encrypt(jweEncrypter);
  return jweObject.serialize();
 }

I have both the encryption key and the signing key.

My question is whether it would be possible to decrypt said token from PL/SQL.
If possible, could you tell me how it could be done?
I've tried to do it with DBMS_CRYPTO but I haven't succeeded.

If it were not possible to do it with PL/SQL code, would it be possible to load the nimbus JOSE JAR file into Oracle to perform the decryption process?

Thank you in advance for your attention and help.

Greetings