(Delphi ActiveX) Create JWS using the Flattened JSON Serialization Format

Creates a JSON Web Signature (JWS) containing 1 signature and output using the flattened JSON serialization format.

Note: This example requires Chilkat v9.5.0.66 or greater.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
sbEccJwk: TChilkatStringBuilder;
eccKey: TPrivateKey;
success: Integer;
jwsProtHdr: TChilkatJsonObject;
jwsUnprotHdr: TChilkatJsonObject;
jws: TChilkatJws;
bIncludeBom: Integer;
payloadStr: WideString;
jwsStr: WideString;
json: TChilkatJsonObject;

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

// Note: This example requires Chilkat v9.5.0.66 or greater.

// The JWS to be created will contain one signature using an ECDSA key.

sbEccJwk := TChilkatStringBuilder.Create(Self);
sbEccJwk.Append('{"kty":"EC",');
sbEccJwk.Append('"crv":"P-256",');
sbEccJwk.Append('"x":"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU",');
sbEccJwk.Append('"y":"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0",');
sbEccJwk.Append('"d":"jpsQnnGQmL-YBIffH1136cspYG6-0iY7X1fCE9-E9LI"');
sbEccJwk.Append('}');

eccKey := TPrivateKey.Create(Self);
// Note: This example loads the ECDSA key from JWK format.  Any format can be loaded
// into the private key object. (See the online reference documentation..)
success := eccKey.LoadJwk(sbEccJwk.GetAsString());
if (success <> 1) then
  begin
    Memo1.Lines.Add(eccKey.LastErrorText);
    Exit;
  end;

// ---------------------------------------------------
// Prepare both a protected and unprotected header.

jwsProtHdr := TChilkatJsonObject.Create(Self);
jwsProtHdr.AppendString('alg','ES256');

jwsUnprotHdr := TChilkatJsonObject.Create(Self);
jwsUnprotHdr.AppendString('kid','myEcKey');

// ---------------------------------------------------
jws := TChilkatJws.Create(Self);

jws.SetProtectedHeader(0,jwsProtHdr.ControlInterface);
jws.SetUnprotectedHeader(0,jwsUnprotHdr.ControlInterface);

jws.SetPrivateKey(0,eccKey.ControlInterface);

bIncludeBom := 0;
payloadStr := 'In our village, folks say God crumbles up the old moon into stars.';
jws.SetPayload(payloadStr,'utf-8',bIncludeBom);

// ---------------------------------------------------
// Create the JWS.
// Indicate we prefer the non-compact, flattened serialization.
jws.PreferCompact := 0;
jws.PreferFlattened := 1;

jwsStr := jws.CreateJws();
if (jws.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(jws.LastErrorText);
    Exit;
  end;

// The jwsStr is contains the flattened JSON in the smallest possible size, which is a single line.
// To get in human-readable format, load into a Chilkat JSON object and emit..
json := TChilkatJsonObject.Create(Self);
json.Load(jwsStr);
json.EmitCompact := 0;
Memo1.Lines.Add(json.Emit());

// Sample output:

// { 
//   "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",
//   "protected": "eyJhbGciOiJFUzI1NiJ9",
//   "header": { 
//     "kid": "myEcKey"
//   },
//   "signature": "b7V2UpDPytr-kMnM_YjiQ3E0J2ucOI9LYA7mt57vccrK1rb84j9areqgQcJwOA00aWGoz4hf6sMTBfobdcJEGg"
// }
end;