encPaymentInstrument JWE encryption example in Java

[Jyothiswaroop]

Hi, 

I'm currently working on Visa VTS project. It would be really helpful to see some examples of Java code for encPaymentInstrument JWE encryption. Could you please send some examples if you have?

Thanks & Regards

[API_Products]

Hey @Jyothiswaroop,

I'm happy to help you. Visa Token Service is a restricted product. Please kindly reach out to developer@visa.com or provide your email address and someone will reach out to you to help you with your Visa Token Service product access request.  

[paul_earnest]

Hi @Jyothiswaroop 

We used the below implementation in JWE construction. You can consider the below code for your JWE implementation.
------
private static String timeStamp() {
    return String.valueOf(System.currentTimeMillis() / 1000L);
}

public String getEncPaymentInstrument(EncryptedPaymentInstrument encryptedPaymentInstrument) {
    try {
        String encPIString = JSONUtil.toJSON(encryptedPaymentInstrument);
        logger.info(encPIString);

        MessageDigest md = MessageDigest.getInstance("SHA-256");
        byte[] digest = md.digest(sharedSecret.getBytes("UTF-8"));

        JsonWebEncryption jwe = new JsonWebEncryption();
        jwe.setAlgorithmHeaderValue(KeyManagementAlgorithmIdentifiers.A256GCMKW);
        jwe.setIv(digest);

        jwe.setEncryptionMethodHeaderParameter(ContentEncryptionAlgorithmIdentifiers.AES_256_GCM);

        jwe.setHeader("iat", timeStamp());
        jwe.setHeader("channelSecurityContext", "SHARED_SECRET");
        jwe.setHeader(HeaderParameterNames.TYPE, "JOSE");

        jwe.setKey(new SecretKeySpec(digest, "AES"));
        jwe.setKeyIdHeaderValue(apiKey);

        jwe.setPayload(encPIString);

        String serializedJwe = jwe.getCompactSerialization();
        return serializedJwe;

    } catch (Exception e) {
        logger.error("Exception in getEncPaymentInstrument()", e);
        throw new IssuerVTSException(IssuerVTSStatusCode.EnrollPanCardVerificationFailed);
    }
}

Regards
Paul