HMAC Generator

Generate and verify HMAC (Hash-based Message Authentication Code) signatures using various algorithms.

Configuration

Algorithm

Output Format

Secret Key

About HMAC

What is HMAC?

HMAC (Hash-based Message Authentication Code) is a specific type of message authentication code involving a cryptographic hash function and a secret key. It can verify both data integrity and authentication of a message.

Common Use Cases

API request authentication
Webhook signature verification
Data integrity verification
Session token generation

Algorithm Comparison

Algorithm	Output Size	Security
HMAC-MD5	128 bits	Weak
HMAC-SHA1	160 bits	Legacy
HMAC-SHA256	256 bits	Recommended
HMAC-SHA384	384 bits	Strong
HMAC-SHA512	512 bits	Strongest