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Generatore di HMAC

Genera firme HMAC usando SHA-1, SHA-256, SHA-384 o SHA-512.

Come usare questo strumento

  1. 1

    Pick a hash algorithm from the dropdown: SHA-1, SHA-256, SHA-384, or SHA-512.

  2. 2

    Type or paste your shared secret key into the key field.

  3. 3

    Type or paste the message you want to authenticate into the message box.

  4. 4

    Click Generate to compute the HMAC; the lowercase hex digest appears below.

Che cos'è il generatore di HMAC?

HMAC (Hash-based Message Authentication Code) verifica sia l'integrità sia l'autenticità di un messaggio usando una chiave segreta condivisa. È la base delle firme dei webhook, della firma delle richieste API (AWS Signature V4, webhook di Stripe) e degli algoritmi HS256/HS384/HS512 dei JWT.

Casi d'uso comuni

  • Verify an incoming webhook by recomputing the HMAC of the raw request body with your endpoint's signing secret and comparing it to the provider's signature header.

  • Check a Stripe webhook locally: HMAC-SHA256 the timestamped payload with your whsec_ secret to confirm your verification logic before deploying.

  • Debug a mismatched signature by pasting the exact bytes your server and client each signed to see which side is wrong.

  • Generate a quick integrity tag for a config file or message so a teammate with the same key can confirm it was not altered in transit.

  • Teach or learn how HMAC differs from a bare hash by toggling algorithms and watching the digest length change.

  • Sanity-check a single HMAC step of a larger signing scheme (such as one round of the AWS SigV4 key-derivation chain) during development.

Domande frequenti

HMAC è la stessa cosa di un hash?
No. Un hash semplice (SHA-256) può calcolarlo chiunque. HMAC richiede una chiave segreta: senza di essa, non è possibile verificare né falsificare la firma.

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