Codificatore, decodificatore e generatore di hash
Converti testo da e verso Base64, Base64url, URL, JWT ed esadecimale e genera firme MD5, SHA-256, SHA-512 e HMAC. Nel tuo browser.
Codifica, decodifica o calcola l hash del testo
Codifica e hash per ingegneri di rete
La codifica converte i dati in formati sicuri per il trasporto, mentre l hash crittografico produce digest a lunghezza fissa per verificare l integrità e autenticare i webhook delle API. Tutto viene eseguito localmente nel browser.
Cosa offre questo strumento
- Conversione bidirezionale Base64, Base64url per URL e parametri URL con gestione degli errori.
- Parser di URL di reindirizzamento captive portal con preset per Cisco Meraki, Aruba ClearPass, Ruckus e Fortinet.
- Suite crittografica completa con MD5, SHA-1, SHA-256, SHA-512 e firme HMAC-SHA256.
Captive portal redirect parameters and URL encoding standards
When a wireless client associates with a guest WiFi network, the access point (AP) or wireless LAN controller (WLC) intercepts the initial HTTP request and issues an HTTP 302 redirect to the external captive portal splash page. To maintain state across the onboarding flow, the controller appends essential hardware and network context to the query string.
1. Cisco Meraki splash parameters
Meraki MR access points pass base_grant_url (the endpoint to authorise the client), user_continue_url (the guest's target URL), node_mac (AP MAC address), and client_mac. Correct percent-encoding of the grant and continue URLs is essential to prevent redirection loops.
2. Aruba ClearPass and Instant AP parameters
Aruba Instant APs and controller-managed architectures pass cmd=login, mac, ip, essid, apname, and url. Nested original destination URLs must be safely decoded when constructing post-login landing pages.
3. Ruckus SmartZone and ZoneDirector parameters
Ruckus controllers forward sip (controller IP), uip (client IP), mac (unformatted or colon-separated MAC), vlan, and url. Our tool detects MAC formats and automatically identifies Ruckus controller redirect structures.
For a complete technical overview of captive portal onboarding protocols, RADIUS authentication, and walled garden configurations, review our comprehensive captive portal technical guide and the RADIUS setup reference guide.
Cryptographic hash functions and webhook signature reference table
Cryptographic hashes produce deterministic, fixed-length digest outputs from arbitrary input data. Unlike encoding (which is fully reversible), cryptographic hashes are one-way functions designed to verify data integrity and authenticate API requests.
| Algorithm | Digest Output Length | Security Status | Primary Application | Standard Specification |
|---|---|---|---|---|
| HMAC-SHA256 | 256 bits (64 hex chars) | Strong (Recommended) | API authentication, webhook signature validation (Purple Webhooks, Stripe) | RFC 2104 / FIPS 198 |
| SHA-256 | 256 bits (64 hex chars) | Strong (Recommended) | TLS certificates, digital signatures, blockchain proof-of-work | FIPS 180-4 / NIST |
| SHA-512 | 512 bits (128 hex chars) | Strong (Recommended) | High-security password hashing (with salt/KDF), data archiving | FIPS 180-4 / NIST |
| SHA-384 | 384 bits (96 hex chars) | Strong (Recommended) | NSA Suite B cryptography, enterprise VPN integrity checks | FIPS 180-4 / NIST |
| SHA-1 | 160 bits (40 hex chars) | Deprecated | Git commit hashes, legacy file integrity checks (insecure for TLS) | RFC 3174 (SHAttered attack 2017) |
| MD5 | 128 bits (32 hex chars) | Insecure / Broken | Legacy non-cryptographic file checksums and Content-MD5 headers | RFC 1321 (Collision vulnerable) |
| CRC32 | 32 bits (8 hex chars) | Non-Cryptographic | Ethernet frame check sequences (FCS), ZIP file archive integrity | IEEE 802.3 |
Understanding the differences: encoding, encryption, and hashing
Encoding (Reversible, No Key)
Transforms data into a format safe for transmission across networks or storage in text systems (e.g. Base64, URL percent-encoding). Anyone can decode encoded data without a secret key. Encoding does not provide confidentiality.
Hashing (One-Way, Deterministic)
Generates a fixed-size fingerprint from input data. It is computationally infeasible to reconstruct the original input from the hash (preimage resistance) or find two inputs with the same hash (collision resistance). Used for integrity checks.
Encryption (Reversible with Key)
Transforms plaintext into ciphertext using a mathematical cipher (e.g. AES-256, RSA) and a cryptographic secret key. Only holders of the decryption key can recover the original data. Provides confidentiality.
Automate guest WiFi onboarding and webhook data delivery
Eliminate manual captive portal scripting. Purple connects natively with Cisco Meraki, Aruba, Ruckus, Fortinet, and Extreme Networks to automate guest authentication, GDPR-compliant data capture, and real-time webhook delivery to your CRM.
Related network engineering tools and technical guides
RADIUS setup guide
Configure FreeRADIUS and Cloud RADIUS servers with Cisco, Aruba, and Ruckus controllers.
SSL certificate checker
Inspect TLS certificates, certificate chains, expiry dates, and SAN extensions for captive portal domains.
MAC address lookup
Identify OUI vendor details, device manufacturers, and randomisation status for connected clients.
Captive portal guide
Comprehensive architectural reference for guest WiFi authentication and compliance.
Frequently asked questions
Qual è la differenza tra codifica, crittografia e hash?
La codifica è reversibile senza chiave. La crittografia protegge i dati con una chiave segreta. L hash è una funzione unidirezionale per verificare l integrità.
Perché è necessaria la codifica URL nei captive portal?
I caratteri speciali devono essere percent-encoded per non essere scambiati per delimitatori URL.
In cosa differisce Base64url da Base64 standard?
Base64url usa - e _ al posto di + e / e rimuove il padding = per un uso sicuro negli URL e nei JWT.
Come si verificano le firme HMAC-SHA256 sui webhook API?
Il server calcola l hash HMAC-SHA256 del corpo della richiesta con la chiave segreta condivisa e confronta i valori.
Quali algoritmi di hash sono sicuri nel 2026?
SHA-256, SHA-384 e SHA-512 sono raccomandati da NIST. MD5 e SHA-1 sono deprecati.
Questo strumento invia dati a server esterni?
No. Tutte le operazioni vengono eseguite al 100% nel browser tramite la Web Crypto API.
Building captive portals or webhook integrations?
Encoding redirect URLs and validating HMAC webhook signatures is part of every custom WiFi deployment. Purple automates the complete onboarding workflow, data validation, and CRM synchronisation across your entire access point fleet.
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