(Unicode C++) ABN AMRO Create Signed JSON Web Token

Demonstrates how to create a signed JWT to be used for authenticating requests to the ABN AMRO REST API's.

For more information, see https://developer.abnamro.com/get-started#headingFive

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#include <CkRsaW.h>
#include <CkPrivateKeyW.h>
#include <CkPublicKeyW.h>
#include <CkJwtW.h>
#include <CkJsonObjectW.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Create public/private key pair (RSA)
    CkRsaW rsa;

    // Generate a 2048-bit key.
    bool success = rsa.GenerateKey(2048);
    if (success != true) {
        wprintf(L"%s\n",rsa.lastErrorText());
        return;
    }

    // Export the key to PEM files.
    // Write one PEM file for the private key, and one for the public key.
    CkPrivateKeyW *privkey = rsa.ExportPrivateKeyObj();
    success = privkey->SavePemFile(L"qa_data/pem/abnAmroPrivateKey.pem");

    CkPublicKeyW *pubkey = rsa.ExportPublicKeyObj();
    success = pubkey->SavePemFile(true,L"qa_data/pem/abnAmroPublicKey.pem");
    // Note: Please share your public key along with your app name and developer email id at api.support@nl.abnamro.com. 
    // Token generation will not work unless public key is associated with your app.

    // Create the JWT.
    CkJwtW jwt;

    // Create the header:
    // {
    //     "typ": "JWT",
    //     "alg": "RS256"
    // }
    CkJsonObjectW jsonHeader;
    jsonHeader.UpdateString(L"typ",L"JWT");
    jsonHeader.UpdateString(L"alg",L"RS256");

    // Create the payload:
    // {
    //     "nbf": 1499947668,
    //     "exp": 1499948668,
    //     "iss": "me",
    //     "sub": "anApiKey",
    //     "aud": "https://auth-sandbox.abnamro.com/oauth/token"
    // }
    CkJsonObjectW jsonPayload;

    int curDateTime = jwt.GenNumericDate(0);

    // Set the "not process before" timestamp to now.
    success = jsonPayload.AddIntAt(-1,L"nbf",curDateTime);

    // Set the timestamp defining an expiration time (end time) for the token
    // to be now + 1 hour (3600 seconds)
    success = jsonPayload.AddIntAt(-1,L"exp",curDateTime + 3600);

    jsonPayload.UpdateString(L"iss",L"me");
    jsonPayload.UpdateString(L"sub",L"anApiKey");
    jsonPayload.UpdateString(L"aud",L"https://auth-sandbox.abnamro.com/oauth/token");

    // Produce the smallest possible JWT:
    jwt.put_AutoCompact(true);

    const wchar_t *jwtStr = jwt.createJwtPk(jsonHeader.emit(),jsonPayload.emit(),*privkey);
    if (jwt.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",jwt.lastErrorText());
        return;
    }

    delete privkey;
    delete pubkey;

    // Here is the JWT:
    wprintf(L"%s\n",jwtStr);
    }