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🔑 HMAC Generator

Compute a keyed-hash message authentication code (HMAC) for data integrity.

ℹ️ About HMAC Generator

The HMAC Generator is a security utility for verifying both the integrity and the authenticity of a message. It combines a cryptographic hash function (like SHA-256) with a secret cryptographic key.

If even a single bit of the message changes, or if an attacker without the secret key attempts to sign the data, the HMAC will not match. This makes it the standard method for securing API requests, webhook signatures, and data-at-rest verification in modern software architectures.

📖 How to use HMAC Generator

  1. 1. Paste the message or data you want to sign into the 'Text' field.
  2. 2. Enter your shared secret key.
  3. 3. Select the hashing algorithm (SHA-256 is the modern standard).
  4. 4. Click 'Run Tool' to generate the hex-encoded signature.

❓ Frequently Asked Questions

How is HMAC different from a regular hash?

A standard hash (like SHA-256) only proves the data hasn't changed. An HMAC includes a secret key, which proves the data was signed by someone who possesses that key.

Which algorithm should I use?

SHA-256 or SHA-512 are recommended for all new applications. MD5 and SHA-1 are considered weak and should only be used for legacy compatibility.

Can I verify an HMAC?

Yes. Simply enter the original text and key; if the resulting signature matches the one you received, the message is authentic.

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