uses System.NetEncoding, System.Hash; function GenerateActivationFile(const MachineID, UserEmail: string; ExpireDays: Integer): string; var ExpireDate: TDateTime; RawData, HashData: string; begin ExpireDate := Now + ExpireDays; RawData := Format('%s|%s|%s', [MachineID, UserEmail, DateToStr(ExpireDate)]); HashData := THashSHA2.GetHashString(RawData, SHA256); Result := TNetEncoding.Base64.Encode(RawData + '|' + HashData); // Save Result to a file, e.g., "activation.key" end;
Here’s a simplified example using Base64 encoding (not secure alone – always use encryption in real apps):
function ValidateActivationFile(const FileName: string): Boolean; var Lines: TStringList; Decoded, MachineIDPart, HashPart, CalculatedHash: string; Parts: TArray<string>; begin Result := False; if not FileExists(FileName) then Exit; Lines := TStringList.Create; try Lines.LoadFromFile(FileName); if Lines.Count = 0 then Exit; Decoded := TNetEncoding.Base64.Decode(Lines[0]); Parts := Decoded.Split(['|']); if Length(Parts) < 3 then Exit; file activation delphi 2016
Result := True; finally Lines.Free; end; end; In your project source (or main form’s OnCreate ):
uses Winapi.Windows, System.SysUtils, System.Classes; function GetMachineID: string; var VolumeSerial: DWORD; MaxCompLen, FileSysFlags: DWORD; RootPath: string; ComputerName: array[0..MAX_COMPUTERNAME_LENGTH + 1] of Char; Size: DWORD; begin RootPath := 'C:'; GetVolumeInformation(PChar(RootPath), nil, 0, @VolumeSerial, MaxCompLen, FileSysFlags, nil, 0); Size := MAX_COMPUTERNAME_LENGTH + 1; GetComputerName(ComputerName, Size); Result := Format('%d-%s', [VolumeSerial, string(ComputerName)]); end; ⚠️ Note: For production, combine multiple identifiers (MAC address, processor ID) to avoid false positives. On your server (or within an admin tool), encrypt the machine ID along with expiration date and features. Use System.NetEncoding and a strong cipher (e.g., Delphi's TCipher_AES from System.Encryption ). uses System
On activation, your server returns this encoded string as a .key or .lic file. When your application starts, locate the activation file and validate it.
// Optional: Check expiration date if StrToDateDef(Parts[2], 0) < Now then Exit; On activation, your server returns this encoded string as a
MachineIDPart := Parts[0]; HashPart := Parts[High(Parts)];