Codificador, decodificador y generador de hash
Convierta texto hacia y desde Base64, Base64url, URL, JWT y hexadecimal, y genere firmas MD5, SHA-256, SHA-512 y HMAC. En su navegador.
Codificar, decodificar o aplicar hash a texto
Codificación y hash diario para ingenieros de red
La codificación convierte datos a formatos de transporte seguros, mientras que el hash criptográfico produce resúmenes de longitud fija para verificar la integridad y autenticar webhooks de API. Esta herramienta se ejecuta 100% en su navegador.
Lo que ofrece esta herramienta
- Conversión bidireccional Base64, Base64url seguro para URL y parámetros de URL con control de errores.
- Analizador de URL de redirección de portal cautivo con ajustes para Cisco Meraki, Aruba ClearPass, Ruckus y Fortinet.
- Conjunto criptográfico completo con MD5, SHA-1, SHA-256, SHA-512 y firmas HMAC-SHA256 con clave secreta.
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
¿Cuál es la diferencia entre codificación, cifrado y hash?
La codificación es reversible sin clave. El cifrado protege datos con una clave secreta. El hash es una función unidireccional para verificar la integridad.
¿Por qué es necesaria la codificación de URL en portales cautivos?
Los caracteres especiales deben codificarse en porcentaje para que los navegadores no los confundan con delimitadores de URL.
¿En qué se diferencia Base64url de Base64 estándar?
Base64url reemplaza + por - y / por _ y elimina el relleno = para su uso en URL y tokens JWT.
¿Cómo se verifican las firmas HMAC-SHA256 en webhooks de API?
El servidor calcula el hash HMAC-SHA256 del cuerpo HTTP usando la clave secreta compartida y compara los valores.
¿Qué algoritmos de hash son seguros en 2026?
SHA-256, SHA-384 y SHA-512 son los estándares recomendados por NIST. MD5 y SHA-1 están obsoletos.
¿Esta herramienta envía datos a servidores externos?
No. Todas las transformaciones se ejecutan de forma local en su navegador mediante la API Web Crypto.
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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