(Delphi ActiveX) Get ECC Public Key in JWK Format (JSON Web Key)

Demonstrates how to get an ECC public key in JWK (JSON Web Key) format.

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

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
sbPem: TChilkatStringBuilder;
success: Integer;
pubKey: TPublicKey;
jwk: WideString;
json: TChilkatJsonObject;

begin
// Note: This example requires Chilkat v9.5.0.66 or later.

// Load a PEM file into memory.
sbPem := TChilkatStringBuilder.Create(Self);
success := sbPem.LoadFile('qa_data/pem/ecc_public.pem','utf-8');
if (success <> 1) then
  begin
    Memo1.Lines.Add('Failed to load PEM file.');
    Exit;
  end;

// Load the PEM into a public key object.
pubKey := TPublicKey.Create(Self);
success := pubKey.LoadFromString(sbPem.GetAsString());
if (success <> 1) then
  begin
    Memo1.Lines.Add(pubKey.LastErrorText);
    Exit;
  end;

// Get the public key in JWK format:
jwk := pubKey.GetJwk();

// The GetJwk method will return the JWK in the most compact JSON format possible,
// as a single line with no extra whitespace.  To get a more human-readable JWK (for this example),
// load into a Chilkat JSON object and emit non-compact:

json := TChilkatJsonObject.Create(Self);
json.Load(jwk);
json.EmitCompact := 0;
Memo1.Lines.Add('ECC Public Key in JWK format:');
Memo1.Lines.Add(json.Emit());

// Sample output:
// { 
//   "kty": "EC",
//   "crv": "P-256",
//   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
//   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU"
// }
// 
// Additional information can be added like this:
json.AppendString('use','enc');
json.AppendString('kid','123ABC');

// Now examine the JSON:
Memo1.Lines.Add(json.Emit());

// { 
//   "kty": "EC",
//   "crv": "P-256",
//   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
//   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
//   "use": "enc",
//   "kid": "123ABC"
// }
end;