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 provides a way to verify both the data integrity and authenticity of a message.

Which HMAC algorithm should I use?

For most modern applications, HMAC-SHA256 or HMAC-SHA512 are recommended. SHA-256 provides excellent security for most use cases, while SHA-512 offers additional security margin. Avoid older algorithms like MD5 or SHA-1 for new applications.

How should I manage HMAC keys?

HMAC keys should be: randomly generated, at least as long as the hash output, stored securely, rotated periodically, and never transmitted in plain text. Use secure key management systems in production environments.

What are common uses for HMAC?

HMAC is commonly used for: API authentication, message integrity verification, digital signatures, secure cookie validation, webhook verification, and secure token generation. It's a fundamental tool in cryptographic protocols.

Are all algorithms supported in browsers?

No, browser support varies. The Web Crypto API typically supports common algorithms like SHA-256 and SHA-512, but specialized algorithms might require server-side implementation or external libraries.

HMAC Generator

Generate Hash-based Message Authentication Codes (HMAC) with support for multiple algorithms. Perfect for API authentication, message integrity verification, and secure token generation.

HMAC Signature Generator

Algorithm

Message

Secret Key

Output Format

Note: Some algorithms might not be supported in your browser's Web Crypto API. For production use, ensure server-side validation.

Features

A comprehensive tool for generating and working with HMAC signatures.

Multiple Algorithms

Support for SHA, MD5, RIPEMD, DES, and other HMAC algorithms

Secure Generation

Uses Web Crypto API for cryptographic operations

Format Options

Output in hexadecimal or base64 encoding

Developer Friendly

Clear interface with instant feedback

Easy Export

One-click copy of generated signatures

Educational Resource

Learn about HMAC implementation best practices

Input Validation

Real-time validation of inputs and parameters

Key Management

Secure handling of cryptographic keys

How to Use the HMAC Generator

Step 1

Select your preferred HMAC algorithm from the dropdown

Step 2

Enter your message and secret key in the respective fields

Step 3

Choose hex or base64 output format

Step 4

Generate and verify your HMAC signature

Frequently Asked Questions about HMAC

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