HMAC Hash Generator
Compute Hash-based Message Authentication Codes (HMAC) securely using standard cryptographic hash algorithms entirely client-side.
Parameters
HMAC Signature Output
-- chars
Computing...
HMAC operations are executed locally in your browser using the Web Crypto API (`crypto.subtle`). Your secret key and message never leave your device.
HMAC Best Practices & Usage
- Message Integrity & Authenticity: HMAC combines a cryptographic hash function with a secret shared key. It guarantees both data integrity and authenticity.
- API Security: Extensively used in webhooks, authorization headers, and request signing (e.g., AWS Signature Version 4, GitHub Webhook signatures).
- Key Management: Keep secret keys secure and rotate them periodically. Never expose private HMAC keys in client-side public code repositories.