HMAC Generator
Thinkforu.org HMAC Generator
Generate secure HMAC signatures for message authentication
User Guide
How to Use the HMAC Generator
- Enter the message you want to authenticate
- Enter your secret key
- Choose the hash algorithm (SHA-256 recommended)
- Select output format (Hex or Base64)
- Click "Generate HMAC" to create the signature
- Use the copy button to copy the HMAC to your clipboard
Features
- Multiple hash algorithms (SHA-256, SHA-384, SHA-512, SHA-1)
- Hex and Base64 output formats
- Client-side processing (your data never leaves your browser)
- Mobile-friendly interface
- Copy to clipboard functionality
Frequently Asked Questions
What is HMAC?
HMAC (Hash-based Message Authentication Code) is a specific type of message authentication code (MAC) involving a cryptographic hash function and a secret cryptographic key. It's used to verify both the data integrity and authenticity of a message.
Which hash algorithm should I use?
SHA-256 is recommended for most applications as it provides a good balance of security and performance. Use SHA-384 or SHA-512 for applications requiring higher security levels.
Is this tool secure?
Yes, all calculations are performed locally in your browser using the Web Crypto API. Your message and secret key never leave your device.
What's the difference between Hex and Base64?
Hexadecimal (Hex) and Base64 are different ways to represent binary data. Hex is longer but uses only numbers 0-9 and letters A-F. Base64 is more compact but uses a larger character set.