Finecam | Registration Code

// 2. Helper functions -------------------------------------------------------- private string SanitizeKey(string input)

// b) Basic structural validation (e.g., groups of 4 chars) if (!IsCorrectStructure(cleaned)) return RegistrationResult.InvalidFormat; finecam registration code

// 1) Decode base64 segment that contains the digital signature // 2) Use the embedded public key (RSA 2048 or ECDSA P‑256) to verify // 3) Constant‑time comparison to avoid timing attacks finecam registration code

private bool VerifySignature(string key) finecam registration code

// Windows: DPAPI ProtectData (CurrentUser) // macOS: Keychain // Linux: libsecret or encrypted file with file‑system ACLs

// f) Persist securely SaveLicenseSecurely(payload);

return RegistrationResult.Success;