Delphi DLL

ABN AMRO Create Signed JSON Web Token

See more ABN AMRO Examples

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

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Jwt, PrivateKey, Rsa, PublicKey, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
rsa: HCkRsa;
privkey: HCkPrivateKey;
pubkey: HCkPublicKey;
jwt: HCkJwt;
jsonHeader: HCkJsonObject;
jsonPayload: HCkJsonObject;
curDateTime: Integer;
jwtStr: PWideChar;

begin
success := False;

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

// Create public/private key pair (RSA)
rsa := CkRsa_Create();

// Generate a 2048-bit key.
privkey := CkPrivateKey_Create();
success := CkRsa_GenKey(rsa,2048,privkey);
if (success = False) then
  begin
    Memo1.Lines.Add(CkRsa__lastErrorText(rsa));
    Exit;
  end;

// Export the key to PEM files.
// Write one PEM file for the private key, and one for the public key.
success := CkPrivateKey_SavePemFile(privkey,'qa_data/pem/abnAmroPrivateKey.pem');

pubkey := CkPublicKey_Create();
CkPrivateKey_ToPublicKey(privkey,pubkey);
success := CkPublicKey_SavePemFile(pubkey,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.
jwt := CkJwt_Create();

// Create the header:
// {
//     "typ": "JWT",
//     "alg": "RS256"
// }
jsonHeader := CkJsonObject_Create();
CkJsonObject_UpdateString(jsonHeader,'typ','JWT');
CkJsonObject_UpdateString(jsonHeader,'alg','RS256');

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

curDateTime := CkJwt_GenNumericDate(jwt,0);

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

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

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

// Produce the smallest possible JWT:
CkJwt_putAutoCompact(jwt,True);

jwtStr := CkJwt__createJwtPk(jwt,CkJsonObject__emit(jsonHeader),CkJsonObject__emit(jsonPayload),privkey);
if (CkJwt_getLastMethodSuccess(jwt) = False) then
  begin
    Memo1.Lines.Add(CkJwt__lastErrorText(jwt));
    Exit;
  end;

// Here is the JWT:
Memo1.Lines.Add(jwtStr);

CkRsa_Dispose(rsa);
CkPrivateKey_Dispose(privkey);
CkPublicKey_Dispose(pubkey);
CkJwt_Dispose(jwt);
CkJsonObject_Dispose(jsonHeader);
CkJsonObject_Dispose(jsonPayload);

end;