FunctionSelector/index.html at main · 6ixtyy/FunctionSelector · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Function Selector Checker</title>
    <script src="https://cdn.jsdelivr.net/npm/ethers@6.10.0/dist/ethers.umd.min.js"></script>
    <script src="https://cdn.tailwindcss.com"></script>
  </head>
  <body class="bg-gray-900 text-white font-mono p-4">
    <div class="max-w-xl mx-auto">
      <h1 class="text-2xl font-bold mb-4">🔍 Function Selector Checker</h1>

      <!-- Single function selector calculator -->
      <div class="mb-8">
        <label class="block mb-2">Function Signature</label>
        <input
          id="sigInput"
          type="text"
          placeholder="transfer(address,uint256)"
          class="w-full p-2 rounded bg-gray-800 border border-gray-600"
        />
        <button
          onclick="calculateSelector()"
          class="mt-2 px-4 py-2 bg-blue-600 rounded hover:bg-blue-700"
        >
          Calculate Selector
        </button>
        <div class="mt-4">
          <p>Selector:</p>
          <div id="selectorResult" class="bg-gray-800 p-2 rounded break-all"></div>
          <button
            onclick="copySelector()"
            class="mt-2 px-3 py-1 bg-green-600 rounded hover:bg-green-700"
          >
            Copy Selector
          </button>
        </div>
      </div>

      <!-- Collision checker -->
      <div class="mb-8">
        <h2 class="text-xl font-bold mb-2"> Collision Checker</h2>
        <label class="block mb-2">Function Signature A</label>
        <input
          id="sigA"
          type="text"
          placeholder="approve(address,uint256)"
          class="w-full p-2 rounded bg-gray-800 border border-gray-600 mb-2"
        />

        <label class="block mb-2">Function Signature B</label>
        <input
          id="sigB"
          type="text"
          placeholder="transfer(address,uint256)"
          class="w-full p-2 rounded bg-gray-800 border border-gray-600"
        />

        <button
          onclick="checkCollision()"
          class="mt-2 px-4 py-2 bg-red-600 rounded hover:bg-red-700"
        >
          Check Collision
        </button>
        <div class="mt-4" id="collisionResult"></div>
      </div>

      <!-- Educational note -->
      <div class="text-sm text-gray-400">
        Function selector collisions can lead to critical vulnerabilities in proxy
        patterns or fallback calls. Always verify selector uniqueness. Built by
        <a href="https://github.com/yourusername" class="underline">Zaki</a>.
      </div>
    </div>

    <script>
      function calculateSelector() {
        const sig = document.getElementById("sigInput").value.trim();
        if (!sig) return;

        const hash = ethers.keccak256(ethers.toUtf8Bytes(sig));
        const selector = hash.slice(0, 10);
        document.getElementById("selectorResult").innerText = selector;
      }

      function copySelector() {
        const selector = document.getElementById("selectorResult").innerText;
        navigator.clipboard.writeText(selector);
        alert("Selector copied!");
      }

      function checkCollision() {
        const sigA = document.getElementById("sigA").value.trim();
        const sigB = document.getElementById("sigB").value.trim();
        if (!sigA || !sigB) return;

        const selA = ethers.keccak256(ethers.toUtf8Bytes(sigA)).slice(0, 10);
        const selB = ethers.keccak256(ethers.toUtf8Bytes(sigB)).slice(0, 10);

        const res = selA === selB
          ? ` Collision detected! Both have selector ${selA}`
          : ` No collision. Selector A: ${selA}, Selector B: ${selB}`;

        document.getElementById("collisionResult").innerText = res;
      }
    </script>
  </body>
</html>