HMAC Generator & Verifier
Security Tools
Verified
★ Popular
Generate and verify Hash-based Message Authentication Codes using various algorithms for secure authentication and data integrity verification
HMAC Generator & Verifier
Generate and verify Hash-based Message Authentication Codes for data integrity and authentication
Generate HMAC
Create a cryptographic hash using your message and secret key
HMAC Information
What is HMAC?
HMAC (Hash-based Message Authentication Code) is a cryptographic authentication technique that combines a secret key with a message and a hash function to create a unique signature.
It provides both data integrity and authentication, ensuring that the message hasn't been tampered with and comes from someone who knows the secret key.
Common Use Cases
• API request authentication
• Digital signatures
• Message integrity verification
• Webhook payload validation
• Secure token generation
• Password-based authentication
Algorithm Comparison
SHA-1: 160 bits (deprecated, use only for legacy support)
SHA-256: 256 bits (recommended for most use cases)
SHA-384: 384 bits (good for high security needs)
SHA-512: 512 bits (maximum security, slower)
Security Best Practices
• Use SHA-256 or higher for new implementations
• Keep secret keys secure and rotate regularly
• Use sufficiently long random secret keys
• Always validate HMAC on the receiving end
• Never log or expose secret keys
• Use constant-time comparison when verifying