WebCrypt/examples/asymmetric.html at main · putervision/WebCrypt · 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" />
    <title>WebCryptAsym — Asymmetric Example</title>
  </head>
  <body>
    <h1>WebCryptAsym — RSA Encryption &amp; ECDSA Signing</h1>
    <p>Generate an RSA keypair for encrypt/decrypt, and an ECDSA keypair for sign/verify.</p>

    <button id="gen">Generate Key Pairs</button>
    <button id="encrypt">Encrypt &amp; Decrypt</button>
    <button id="sign">Sign &amp; Verify</button>
    <pre id="out"></pre>

    <script type="module">
      // For npm users: import { WebCryptAsym } from 'webcrypt';
      import { WebCryptAsym } from "../src/WebCryptAsym.js";

      const asym = new WebCryptAsym();
      const out = document.getElementById("out");
      let rsaKeys, sigKeys;

      document.getElementById("gen").addEventListener("click", async () => {
        out.textContent = "Generating RSA-4096 key pair (this may take a moment)...";
        rsaKeys = await asym.generateKeyPair();
        const pubB64 = await asym.exportPublicKey(rsaKeys.publicKey);
        out.textContent = `RSA Public Key (SPKI, base64):\n${pubB64}\n`;

        out.textContent += "\nGenerating ECDSA signing key pair...";
        sigKeys = await asym.generateSigningKeyPair("P-256");
        out.textContent += `\nECDSA Public Key (base64):\n${sigKeys.publicKeyB64}`;
      });

      document.getElementById("encrypt").addEventListener("click", async () => {
        if (!rsaKeys) {
          out.textContent = "Generate keys first.";
          return;
        }
        const message = "Hello from WebCryptAsym!";
        out.textContent = `Encrypting: "${message}"...\n`;

        const encrypted = await asym.encryptText(message, rsaKeys.publicKey);
        out.textContent += `Encrypted (base64): ${encrypted.slice(0, 60)}...\n`;

        const decrypted = await asym.decryptText(encrypted, rsaKeys.privateKey);
        out.textContent += `Decrypted: "${decrypted}"`;
      });

      document.getElementById("sign").addEventListener("click", async () => {
        if (!sigKeys) {
          out.textContent = "Generate keys first.";
          return;
        }
        const message = "I approve transaction #123";
        out.textContent = `Signing: "${message}"...\n`;

        const signature = await asym.signText(message, sigKeys.privateKey);
        out.textContent += `Signature (base64): ${signature}\n`;

        const valid = await asym.verifyText(message, signature, sigKeys.publicKey);
        out.textContent += valid ? "Signature valid ✅" : "Signature invalid ❌";
      });
    </script>
  </body>
</html>