🛡️HMAC Hash Generator Documentation & Guide
Security & Privacy
The HMAC Keyed-Hash Generator produces cryptographic Hash-based Message Authentication Codes (HMAC) using SHA-256 or SHA-512 and secret keys via the browser Web Cryptography API.
📋How to Use This Tool
- Enter Message Data: Provide the message payload, JSON string, or webhook body to authenticate.
- Provide Secret Key: Enter your shared secret or API signing key.
- Select Algorithm & Encoding: Choose SHA-256, SHA-512, or legacy SHA-1, and select Hexadecimal or Base64 encoding.
- Click Generate HMAC: Execute hardware-accelerated Web Crypto API hashing and copy the signature.
⚙️Technical & Algorithmic Details
• W3C Web Cryptography API: Uses crypto.subtle.importKey and crypto.subtle.sign for FIPS-compliant cryptographic speed and security.
• RFC 2104 Compliance: Implements standard keyed-hashing for message authentication (HMAC = H(K XOR opad || H(K XOR ipad || m))).
• Multiple Encoding Outputs: Exports lower-case hexadecimal digests or standard Base64 encoded strings.
💡Practical Use Cases & Best Practices
- Verifying incoming webhook signatures from Stripe, GitHub, Shopify, or Slack.
- Generating API authentication headers (such as AWS Signature Version 4 or custom API HMACs).
- Testing JWT token signature generation and cryptographic integrity checks.
100% Client-Side Privacy Guarantee:Secret keys and message payloads never touch external servers. All cryptographic operations run in browser hardware memory.
