Pascal (Lazarus/Delphi)

Generate an ECC Key (Public and Private)

See more ECC Examples

Demonstrates how to generate an ECC key and save both public and private parts. 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.PublicKey,
  Chilkat.PrivateKey,
  Chilkat.Prng,
  Chilkat.Ecc;

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

procedure RunDemo;
var
  success: Boolean;
  fortuna: TPrng;
  entropy: string;
  ecc: TEcc;
  privKey: TPrivateKey;
  pubKey: TPublicKey;
  bPreferPkcs1: Boolean;

begin
  success := False;

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

  //  Create a Fortuna PRNG and seed it with system entropy.
  //  This will be our source of random data for generating the ECC private key.
  fortuna := TPrng.Create;
  entropy := fortuna.GetEntropy(32,'base64');
  success := fortuna.AddEntropy(entropy,'base64');

  ecc := TEcc.Create;

  //  Generate a random ECC private key on the secp256r1 curve.
  //  Chilkat also supports other curves, such as secp384r1, secp521r1, and secp256k1.

  privKey := TPrivateKey.Create;
  success := ecc.GenKey('secp256r1',fortuna,privKey);
  if (success = False) then
    begin
      WriteLn(ecc.LastErrorText);
      Exit;
    end;

  //  Save the private key to PKCS8 encrypted PEM
  //  (The private key can be saved in a variety of different formats. See the online reference documentation.)
  success := privKey.SavePkcs8EncryptedPemFile('pemPassword','qa_output/eccPrivKey.pem');
  if (success <> True) then
    begin
      WriteLn(privKey.LastErrorText);
    end;

  //  The private key PEM looks like this:

  //  	-----BEGIN ENCRYPTED PRIVATE KEY-----
  //  	MIHFMEAGCSqGSIb3DQEFDTAzMBsGCSqGSIb3DQEFDDAOBAhUmn+1/lwCIwICCAAw
  //  	FAYIKoZIhvcNAwcECPlyNXAXZO+oBIGAIvxvTENXJWbrCwSjh0QNxLecBotUpfI5
  //  	auOonLmwVMyt1ahMmNyVo/D+pnKQSE41Fg8fApM0DCDKZUOVCCcK1qirIsMPQkGp
  //  	klPJbvrQRVYgzBtU31uNB5y2wqhrIeepal1HXBvbkUK0nfJMbcdz/XAEIQu2HhTD
  //  	t6LMScPQld4=
  //  	-----END ENCRYPTED PRIVATE KEY-----

  //  Now get the public key part from the private key.
  //  (A public key is actually a subset of the private key.)
  pubKey := TPublicKey.Create;
  privKey.ToPublicKey(pubKey);

  //  Save the public key to a PEM file.
  //  (The public key can be saved in a variety of different formats. See the online reference documentation.)
  //  For ECC keys, the 1st argument (bPreferPkcs1) is ignored and unused.
  bPreferPkcs1 := False;
  success := pubKey.SavePemFile(bPreferPkcs1,'qa_output/eccPubKey.pem');

  //  The public key PEM looks like this:

  //  	-----BEGIN PUBLIC KEY-----
  //  	MIIBSzCCAQMGByqGSM49AgEwgfcCAQEwLAYHKoZIzj0BAQIhAP////8AAAABAAAA
  //  	AAAAAAAAAAAA////////////////MFsEIP////8AAAABAAAAAAAAAAAAAAAA////
  //  	///////////8BCBaxjXYqjqT57PrvVV2mIa8ZR0GsMxTsPY7zjw+J9JgSwMVAMSd
  //  	NgiG5wSTamZ44ROdJreBn36QBEEEaxfR8uEsQkf4vOblY6RA8ncDfYEt6zOg9KE5
  //  	RdiYwpZP40Li/hp/m47n60p8D54WK84zV2sxXs7LtkBoN79R9QIhAP////8AAAAA
  //  	//////////+85vqtpxeehPO5ysL8YyVRAgEBA0IABGdOH8uM6SfX3mdV+TR0mWp2
  //  	gfVRPlxWxwhOiowuNByBxmQz7ZR4CJY1XcN2zkUo5pzW73ZhGwgd2XTOvqPqG40=
  //  	-----END PUBLIC KEY-----
  //  

  WriteLn('finished.');


  fortuna.Free;
  ecc.Free;
  privKey.Free;
  pubKey.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.