Pascal (Lazarus/Delphi)

BCrypt Verify a Password (Check if Password is Correct)

See more Encryption Examples

A system that uses BCrypt for storing passwords would not store the actual password, but would instead store the bcrypt hash of the password. When a user presents the password, such as for login, call BCryptVerify to verify the password against the stored bcrypt hash.

Note: This example requires Chilkat v9.5.0.65 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.Crypt2;

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

procedure RunDemo;
var
  crypt: TCrypt2;
  storedHash: string;
  password: string;
  passwordValid: Boolean;

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

  crypt := TCrypt2.Create;

  storedHash := '$2a$10$H5kIVktMGzAPKGKNAe9DVu0iwEqfhv/o4MMJ/Dzw/MPy1leOE9NOK';
  password := 'mySecretPassword';

  passwordValid := crypt.BCryptVerify(password,storedHash);
  if (passwordValid = True) then
    begin
      WriteLn(password + ' is valid.');
    end
  else
    begin
      WriteLn(password + ' is NOT valid.');
    end;

  password := 'notAValidPassword';
  passwordValid := crypt.BCryptVerify(password,storedHash);
  if (passwordValid = True) then
    begin
      WriteLn(password + ' is valid.');
    end
  else
    begin
      WriteLn(password + ' is NOT valid.');
    end;

  //  Output should be:

  //  	mySecretPassword is valid.
  //  	notAValidPassword is NOT valid.


  crypt.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.