Pascal (Lazarus/Delphi)

secp256k1 Key Generation and Keccak-256

See more ECC Examples

Starting in v11.0.0, Chilkat supports both secp256k1 key generation and Keccak-256 directly. These algorithms are typically used for Bitcoin and Ethereum. 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.BinData,
  Chilkat.StringBuilder,
  Chilkat.PrivateKey,
  Chilkat.Prng,
  Chilkat.Ecc;

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

procedure RunDemo;
var
  success: Boolean;
  fortuna: TPrng;
  entropy: string;
  ecc: TEcc;
  privKey: TPrivateKey;
  sb: TStringBuilder;
  bd: TBinData;

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 ECDSA private key.
  fortuna := TPrng.Create;
  entropy := fortuna.GetEntropy(32,'base64');
  success := fortuna.AddEntropy(entropy,'base64');

  ecc := TEcc.Create;

  //  Generate a random ECDSA private key on the secp256k1 curve.
  privKey := TPrivateKey.Create;
  success := ecc.GenKey('secp256k1',fortuna,privKey);
  if (success = False) then
    begin
      WriteLn(ecc.LastErrorText);
      Exit;
    end;

  WriteLn('Successfully generated a sec256k1 key.');

  //  Show how to compute the Keccak-256 hash in a few ways.
  sb := TStringBuilder.Create;
  sb.Append('hello');

  WriteLn('keccak-256: ' + sb.GetHash('keccak-256','hex_lower','utf-8'));

  //  Output:
  //  keccak-256: 1c8aff950685c2ed4bc3174f3472287b56d9517b9c948127319a09a7a36deac8

  //  To keccak-256 hash binary data
  bd := TBinData.Create;
  bd.AppendEncoded('00010203040506','hex');

  WriteLn('keccak-256: ' + bd.GetHash('keccak-256','hex_lower'));

  //  Output:
  //  keccak-256: 801560412425120fa609be232d6fa71c7f64f42aee7977267687dcc0a2f5aa63


  fortuna.Free;
  ecc.Free;
  privKey.Free;
  sb.Free;
  bd.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.