Generate HMAC digest
Calculate HMAC authentication bytes.
Local processing · Nothing is uploaded · Maximum 10 MB per file
Input & settings
Ready. Enter your input to begin.
How to use this tool
Calculate HMAC authentication bytes.
Limits and behavior
Results are generated in your browser, not uploaded to CraftAI. Inputs are size-limited and validated. Calculate HMAC authentication bytes. Enter your own input, adjust settings, then process. Inspect and save the generated result. Reset or cancel to clear results. HMAC over UTF-8 message and key, produced locally. No key is stored.
Calculate a message authentication code
Generate an HMAC from a supplied key and message for compatible development checks.
Is an HMAC the same as a public-key digital signature?
No. HMAC relies on a shared secret and does not provide asymmetric signer identity guarantees.
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