Poly1305 Key Generator Online - Generate 32-byte Authentication Keys

About Poly1305

Poly1305 is a cryptographic message authentication code (MAC) designed by Daniel J. Bernstein. It provides high-speed, high-security message authentication.

High Performance

One of the fastest authentication algorithms available

Proven Security

Mathematically proven 128-bit security guarantee

Fixed Size

32-byte key, 16-byte tag output

IETF Standard

RFC 8439 (ChaCha20-Poly1305)

Important: Poly1305 keys are ONE-TIME USE only. Never reuse a key for multiple messages. Use ChaCha20-Poly1305 AEAD for automatic key derivation.

Key Structure

A Poly1305 key is 256 bits (32 bytes) divided into two parts:

r (16 bytes): The secret multiplier, "clamped" for security
s (16 bytes): The secret nonce for final addition

Usage Example

      // Using libsodium (Node.js)
const sodium = require('libsodium-wrappers');

await sodium.ready;

// Generate key
const key = sodium.randombytes_buf(32);

// Create MAC
const message = new TextEncoder().encode("Hello, World!");
const mac = sodium.crypto_onetimeauth(message, key);

// Verify MAC
const isValid = sodium.crypto_onetimeauth_verify(mac, message, key);
console.log(isValid); // true
    

Poly1305 Key Generator

Generate Poly1305 Key