Pascal (Lazarus/Delphi)

Load an Ed25519 Private Key from Hex

See more Ed25519 Examples

Demonstrates how to load an Ed25519 private key from raw hex bytes.

Note: This example requires Chilkat v9.5.0.83 or greater.

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.StringBuilder;

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

procedure RunDemo;
var
  success: Boolean;
  privKey: TPrivateKey;
  privKeyHex: string;
  pubKeyHex: string;
  privKey2: TPrivateKey;
  sbPubKeyHex: TStringBuilder;

begin
  success := False;

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

  privKey := TPrivateKey.Create;

  //  We have the hexidecimal encoded bytes of the private key and public key:
  privKeyHex := 'd4ee72dbf913584ad5b6d8f1f769f8ad3afe7c28cbf1d4fbe097a88f44755842';
  pubKeyHex := '19bf44096984cdfe8541bac167dc3b96c85086aa30b6b6cb0c5c38ad703166e1';

  //  Load these values into the Chilkat private key object:
  success := privKey.LoadEd25519(privKeyHex,pubKeyHex);
  if (success = False) then
    begin
      WriteLn(privKey.LastErrorText);
      Exit;
    end;

  //  ---------------------------------------------------------------
  //  We don't actually need the public key.  If we pass an empty string for the public key,
  //  Chilkat will automatically compute it.
  privKey2 := TPrivateKey.Create;
  success := privKey2.LoadEd25519(privKeyHex,'');

  //  Let's get the public key to see that it computed the same value.
  sbPubKeyHex := TStringBuilder.Create;
  privKeyHex := privKey2.GetRawHex(sbPubKeyHex);
  WriteLn('computed public key = ' + sbPubKeyHex.GetAsString());

  //  The output should be:
  //  computed public key = 19bf44096984cdfe8541bac167dc3b96c85086aa30b6b6cb0c5c38ad703166e1


  privKey.Free;
  privKey2.Free;
  sbPubKeyHex.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.