HMAC Generator
Generate Hash-based Message Authentication Codes (HMAC) using secret keys. Securely sign API requests and verify data authenticity.
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Applications
Crucial for securely signing API requests (e.g., AWS, Stripe) and authenticating messages between two parties who share a secret key.
The Formula
HMAC(K, m) = H((K ⊕ opad) || H((K ⊕ ipad) || m)) where K is the key and m is the message. It prevents length-extension attacks.
Fun Fact: HMAC is considered significantly more secure than simple hash-based signatures because it digests the secret key twice.
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