Fydler UtilityBelt - HMAC Generator

HMAC Generator

Security & Authentication Tool

Algorithm

Secret Key

Message

HMAC Signature (Hex)

What is HMAC?

HMAC (Hash-based Message Authentication Code) is a specific type of message authentication code involving a cryptographic hash function and a secret cryptographic key. It can be used to simultaneously verify both the data integrity and the authenticity of a message.

Copied to clipboard!

lucide.createIcons(); const algoSelect = document.getElementById('algo-select'); const keyInput = document.getElementById('hmac-key'); const messageInput = document.getElementById('hmac-message'); const output = document.getElementById('hmac-output'); async function generateHMAC() { const algo = algoSelect.value; const key = keyInput.value; const message = messageInput.value; if (!key || !message) { output.value = ''; return; } try { const fn = algo === 'sha256' ? hashwasm.createSHA256() : algo === 'sha512' ? hashwasm.createSHA512() : hashwasm.createMD5(); const inst = await hashwasm.createHMAC(fn, key); const hmac = inst.init().update(message).digest('hex'); output.value = hmac; } catch (e) { output.value = 'Error: ' + e.message; } } [algoSelect, keyInput, messageInput].forEach(el => { el.addEventListener('input', generateHMAC); }); document.getElementById('copy-btn').addEventListener('click', () => { if (output.value && !output.value.startsWith('Error')) { navigator.clipboard.writeText(output.value); showToast('Copied to clipboard!'); } }); function showToast(msg) { const toast = document.getElementById('toast'); const toastMsg = document.getElementById('toast-message'); toastMsg.textContent = msg; toast.classList.add('show'); setTimeout(() => toast.classList.remove('show'), 2000); }