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HMAC Generator

Generate HMAC signatures with various hash algorithms

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Enter message and key to generate HMAC

Description

The HMAC Generator creates Hash-based Message Authentication Codes (HMAC) using a secret key. HMAC provides both data integrity and authentication, commonly used in API signatures and secure communications.

Key features

  • Support for SHA-256, SHA-384, SHA-512
  • Key-based message authentication
  • API signature generation
  • Real-time hash output

Common use cases

  • API request signing
  • Webhook verification
  • Message authentication
  • Data integrity verification

Privacy & security: All HMAC generation happens locally in your browser.

How to Use

  1. Enter your message data.
  2. Enter your secret key.
  3. Select the hash algorithm.
  4. Copy the generated HMAC signature.

Example

Example: API Signature

Input:

Message: {"user": "john", "action": "update"}
Key: my-secret-key
Algorithm: SHA-256

Output:

a1b2c3d4e5f6...

FAQ

What is HMAC?

HMAC is a mechanism for message authentication using cryptographic hash functions and a secret key.

Which algorithm should I use?

SHA-256 is most common. Use SHA-512 for higher security requirements.