Pascal (Lazarus/Delphi)

Load ECC Private Key from JWK Format (JSON Web Key)

See more ECC Examples

Demonstrates how to load an ECC private key from JWK (JSON Web Key) format.

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

Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.PrivateKey,
  Chilkat.JsonObject;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  json: TJsonObject;
  jwkStr: string;
  privKey: TPrivateKey;

begin
  success := False;

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

  //  First build a JWK sample to load..
  json := TJsonObject.Create;
  json.UpdateString('kty','EC');
  json.UpdateString('crv','P-256');
  json.UpdateString('x','oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE');
  json.UpdateString('y','vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU');
  json.UpdateString('d','EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM');

  //  The JSON contains the following:
  //  { 
  //    "kty": "EC",
  //    "crv": "P-256",
  //    "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
  //    "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
  //    "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM"
  //  }

  //  Note: The JSON can contain other members, such as "use", "kid", or anything else.  These will be ignored.
  json.EmitCompact := False;

  //  Show the JWK string to be loaded:
  jwkStr := json.Emit();

  privKey := TPrivateKey.Create;
  success := privKey.LoadJwk(jwkStr);
  if (success <> True) then
    begin
      WriteLn(privKey.LastErrorText);
      Exit;
    end;

  //  OK.. the JWK is loaded.  It can be used in whatever way desired...

  //  The key can be retrieved in any other format, such as XML or PEM..
  WriteLn(privKey.GetXml());

  //  XML output:
  //  <ECCKeyValue curve="secp256r1">MHcCAQEEIBG1c3z52T8XwMsahGVdOZWgKCQJfv+l7djuJjgetdbDoAoGCCqGSM49AwEHoEQDQgAEoBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxG+9DLFmRSMlBQ9T/RsLLc+PmpB1+7yPAR+oR5gZn3kJQ==</ECCKeyValue>

  WriteLn(privKey.GetPkcs8EncryptedPem('secret'));

  //  PEM output
  //  
  //  -----BEGIN ENCRYPTED PRIVATE KEY-----
  //  MIHFMEAGCSqGSIb3DQEFDTAzMBsGCSqGSIb3DQEFDDAOBAiku9rUjavLQQICCAAw
  //  FAYIKoZIhvcNAwcECGsl/5nLai+JBIGAVIqKAdfcRQNLl1t3x+n8OZ92d1H+qgjS
  //  Hs83wn2joJK4nlqy+rzosZxQ3e8NTJQyUEWZWcjqMj/N0phS3QWtcD/qbda5oEcv
  //  QgtU60cZ4ql3truefAmlZz2PdpOfqtYhxlvjJQxnyojn4ntj69OwLOt9SZbaBQQi
  //  KUL8KXT4Pq8=
  //  -----END ENCRYPTED PRIVATE KEY-----


  json.Free;
  privKey.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.