Pascal (Lazarus/Delphi)

RSA Encrypt with Modulus and Exponent

See more RSA Examples

Demonstrates how to RSA encrypt with a given modulus and exponent. 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.Rsa,
  Chilkat.Xml;

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

procedure RunDemo;
var
  success: Boolean;
  rsa: TRsa;
  modulus: string;
  exponent: string;
  xml: TXml;
  pubKey: TPublicKey;
  usePrivateKey: Boolean;
  plainText: string;
  encryptedStrBase64: string;

begin
  success := False;

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

  rsa := TRsa.Create;

  //  Assuming you already have a base64 modulus and exponent,
  //  wrap it in XML like this:
  modulus := 'qMBRpdYrAy5aMmo31NErUizh5sbweguSmh4wlK6uJEIDl+kwTlROnE34KOFExeTbJSX0WygPi+vWl0yNq7buIMUKpytossAAWut5khO3CQJxTk7G2gnEPNUUXHiExGgNrLzcSLv8YIlfVALhoRWyC67KOL+a+3taNq3h+BHeWhM=';
  exponent := 'AQAB';

  xml := TXml.Create;
  xml.Tag := 'RSAPublicKey';
  xml.NewChild2('Modulus',modulus);
  xml.NewChild2('Exponent',exponent);

  pubKey := TPublicKey.Create;
  success := pubKey.LoadFromString(xml);
  if (success = False) then
    begin
      WriteLn(pubKey.LastErrorText);
      Exit;
    end;

  success := rsa.UsePublicKey(pubKey);
  if (success = False) then
    begin
      WriteLn(rsa.LastErrorText);
      Exit;
    end;

  usePrivateKey := False;
  plainText := 'message in a bottle';

  rsa.EncodingMode := 'base64';
  encryptedStrBase64 := rsa.EncryptStringENC(plainText,usePrivateKey);
  WriteLn(encryptedStrBase64);


  rsa.Free;
  xml.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.