jwt java signing

jwt java signing

    private String createBearerToken() throws Exception {
        byte[] decoded = ("-----BEGIN RSA PRIVATE KEY-----\n" +
                "-----END RSA PRIVATE KEY-----\n").getBytes();

        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
        PEMParser pemParser = new PEMParser(new BufferedReader(new InputStreamReader(new ByteArrayInputStream(decoded))));
        JcaPEMKeyConverter converter = new JcaPEMKeyConverter().setProvider("BC");
        Object object = pemParser.readObject();
        KeyPair kp = converter.getKeyPair((PEMKeyPair) object);
        java.security.interfaces.RSAPrivateKey generatedPvk = (java.security.interfaces.RSAPrivateKey)kp.getPrivate();

        // Create RSA-signer with the private key
        JWSSigner signer = new RSASSASigner(generatedPvk);

// Prepare JWT with claims set
        JWTClaimsSet claimsSet = new JWTClaimsSet.Builder()
                .subject("alice")
                .issuer("https://c2id.com")
                .expirationTime(new Date(new Date().getTime() + 60 * 1000))
                .build();

        SignedJWT signedJWT = new SignedJWT(
                new JWSHeader(JWSAlgorithm.RS256),
                claimsSet);

// Compute the RSA signature
        signedJWT.sign(signer);

        return signedJWT.serialize();

    }