HMAC Generator
Generate Hash-based Message Authentication Codes (HMAC) for message authentication and API signature verification.
HMAC Generator
Generate HMAC signatures for message authentication.
🔐 About HMAC
Hash-based Message Authentication Code (HMAC) provides both data integrity and authenticity. Used extensively for API signature verification and webhook validation.
- API request signing (AWS, GitHub, Stripe)
- Webhook signature verification
- JWT token signing
- Message authentication
- Password-based authentication
What is HMAC?
HMAC provides both data integrity and authenticity by combining a cryptographic hash function with a secret key. It's widely used for API authentication and webhook verification.
How HMAC Works
Secret Key: Shared between sender and receiver
Message: Data to be authenticated
Hash Function: SHA-256 or SHA-1
Output: HMAC signature that proves message authenticity
Common Use Cases
API Authentication: AWS, GitHub, Stripe API signatures
Webhook Verification: Confirm webhook payload authenticity
JWT Signing: JSON Web Token signatures
Message Authentication: Prove message hasn't been tampered with
Example Workflow
Security Best Practices
Keep secret keys confidential
Use strong, random secret keys
Prefer HMAC-SHA256 over HMAC-SHA1
Implement constant-time comparison for verification
