Integrity plus authenticity
Unlike an ordinary hash, HMAC includes a shared secret so a receiver can check both content integrity and knowledge of the key.
HMAC Generator
Generate SHA-256, SHA-384, or SHA-512 keyed message authentication codes locally.
HMAC generator
Authenticate a message with a shared secret.
Compare exact bytes
Line endings, character encoding, and every space affect the result. Use the exact message bytes expected by the receiving system.