// 1. Public API -------------------------------------------------------------- public RegistrationResult Register(string userInput)
return RegistrationResult.Success;
private bool VerifySignature(string key) finecam registration code
// f) Persist securely SaveLicenseSecurely(payload); if (cleaned == null) return RegistrationResult.InvalidFormat
// a) Sanitize input string cleaned = SanitizeKey(userInput); if (cleaned == null) return RegistrationResult.InvalidFormat; finecam registration code
// Trim, upper‑case, remove whitespace/hyphens as needed // Return null if characters outside allowed set are found
// 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