(C# UWP/WinRT) 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

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

// Create public/private key pair (RSA)
Chilkat.Rsa rsa = new Chilkat.Rsa();

// Generate a 2048-bit key.
bool success = rsa.GenerateKey(2048);
if (success != true) {
    Debug.WriteLine(rsa.LastErrorText);
    return;
}

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

Chilkat.PublicKey pubkey = rsa.ExportPublicKeyObj();
success = pubkey.SavePemFile(true,"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.
Chilkat.Jwt jwt = new Chilkat.Jwt();

// Create the header:
// {
//     "typ": "JWT",
//     "alg": "RS256"
// }
Chilkat.JsonObject jsonHeader = new Chilkat.JsonObject();
jsonHeader.UpdateString("typ","JWT");
jsonHeader.UpdateString("alg","RS256");

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

int curDateTime = jwt.GenNumericDate(0);

// Set the "not process before" timestamp to now.
success = jsonPayload.AddIntAt(-1,"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,"exp",curDateTime + 3600);

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

// Produce the smallest possible JWT:
jwt.AutoCompact = true;

string jwtStr = jwt.CreateJwtPk(jsonHeader.Emit(),jsonPayload.Emit(),privkey);
if (jwt.LastMethodSuccess != true) {
    Debug.WriteLine(jwt.LastErrorText);
    return;
}

// Here is the JWT:
Debug.WriteLine(jwtStr);