Delphi DLL Requires Chilkat v11.0.0+

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

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);