HMAC Generator
Generate Keyed-Hash Message Authentication Codes (HMAC-SHA256) given a secret key.
About HMAC Generator
The HMAC Keyed-Hash Message Authentication Code Generator computes cryptographic authentication signatures (HMAC-SHA256, HMAC-SHA512, HMAC-MD5, HMAC-SHA1) for API webhook verification (Stripe, GitHub, Shopify, AWS Signature v4).
How to Use HMAC Generator
Step 1
Enter your secret signing key.
Step 2
Paste the message or payload into the data pane.
Step 3
Select algorithm (e.g. HMAC-SHA256).
Step 4
Click "Copy HMAC Signature".
Practical Use Cases for HMAC Generator
Payment Gateway Webhook Verification
Verify HMAC-SHA256 webhook signatures from Stripe (`Stripe-Signature`), Shopify, PayPal, and GitHub webhooks.
AWS Signature Version 4 Signing
Compute HMAC-SHA256 authorization signatures for Amazon Web Services (AWS) REST API requests.
Input & Output Examples
Computing HMAC-SHA256 Signature
Secret Key: secret123 | Message: {"event": "payment_success"}HMAC-SHA256: 64-character hexadecimal authentication signature
Key Features & Performance
- ✓Supports HMAC-SHA256, HMAC-SHA512, HMAC-SHA384, HMAC-SHA1, and HMAC-MD5.
- ✓Outputs Hexadecimal, Base64, and Base64URL signature formats.
- ✓Supports UTF-8 string keys and Hexadecimal raw byte keys.
- ✓100% Client-Side calculation guarantees API secret confidentiality.
- ✓1-Click Copy signature.
Key Terminology & Definitions
HMAC (Hash-based Message Authentication Code)
A specific construction for calculating a message authentication code involving a cryptographic hash function in combination with a secret key (RFC 2104).
Webhook Verification
A security practice where a receiver validates that an incoming webhook payload was truly sent by the authentic service without tampering.