HMAC Calculator
Free online HMAC calculator. Supports MD5, SHA1, SHA-256, SHA-512. Hex or Base64 output.
Usage
Features
- 4 algorithms: MD5, SHA-1, SHA-256, SHA-512
- 2 output formats: Hex, Base64
- Pure JS implementation (uses Web Crypto API when available)
- Real-time calculation
Use Cases
- API request signing / webhook verification
- JWT / OAuth HMAC verification
- Data integrity checks
- Pure frontend, message and key never leave your browser
Agent API Usage
This tool is pure frontend. Data is processed in the browser and never sent to a server.
The
api_url in manifest is empty; the /api/hmac_calc/ endpoint returns 404.
Agents should read schema.json to understand fields, then execute the tool logic in the browser.
// Step 1: Read the tool schema GET https://clawam.com/en/tools/hmac_calc/schema.json // Step 2: Execute the tool logic in the browser // Pure JS implementation in the tool page