KMAC256 File Hash Generator

What is KMAC256?

KMAC256 is a cryptographic hash function that produces a fixed-size hash value from variable-length input data. KMAC (Keccak Message Authentication Code) is a variable-output-length PRF and keyed hash function based on Keccak. It provides authentication and integrity with a secret key. This tool allows you to upload files and calculate their KMAC256 hash for verification and integrity checking.

How to Use KMAC256

1. Click "Select File" or drag and drop your file into the upload area. 2. The KMAC256 hash will be calculated automatically. 3. Copy the resulting hash value for verification or storage. All processing happens locally in your browser - no files are uploaded to any server.

When to Use KMAC256

Use KMAC256 when you need authenticated message verification with a secret key, such as API authentication or secure communication protocols.

How KMAC256 Works

KMAC256 combines a secret key with the message using the cSHAKE function. It provides both authentication (proving the message came from someone with the key) and integrity (detecting modifications). The file is read in chunks and processed incrementally to handle large files efficiently without loading the entire file into memory.

Common Use Cases

• Message authentication
• Key derivation functions
• API authentication
• Secure communications
• Digital signatures