HMAC Generator
Compute HMAC (Hash-based Message Authentication Code) signatures using SHA-256 or SHA-512. Essential for verifying webhook payloads, signing API requests, and implementing JWT manually. Outputs both hex and Base64 encoded signatures.
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Common Use Cases
- Verify GitHub, Stripe, or Slack webhook signatures
- Sign API requests with HMAC authentication
- Implement custom JWT signature verification
- Debug HMAC-based authentication flows
Frequently Asked Questions
What is HMAC used for?
HMAC is used to verify both the integrity and authenticity of a message. Common uses include webhook signature verification (GitHub, Stripe), API request signing (AWS, Shopify), and as the signature algorithm in JWTs.
What is the difference between HMAC and a plain hash?
A plain hash (like SHA-256) has no secret — anyone can compute it. HMAC uses a secret key, so only parties that know the key can generate or verify the signature. This prevents tampering.
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Tool Info
CategorysecurityAI EnhancementNoData StorageZero retention