cold-wallet-generator/binance.html at main · expatjedi/cold-wallet-generator · 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>Binance BNB Cold Wallet</title>
    <link rel="stylesheet" href="css/style2.css">
    <!-- Binance BNB addresses use secp256k1 and bech32 (bnb...) -->
    <script src="js/elliptic-hash-bech32.min.js"></script>
    <script src="js/qrcode.js"></script>
    <script src="js/bip39.min.js"></script>
</head>
<body onload="generate()">
    <div class="container">
        <h1>Binance BNB Cold Wallet</h1>
        <div class="button-group">
            <button onclick="window.location.href='index.html'">Home</button>
            <button onclick="generate()">Generate</button>
            <button onclick="window.print()">Print</button>
        </div>
        <div class="info-box">
            <label>Public Address (SHARE)</label>
            <span id="public">Click Generate to create wallet</span>
            <div id="public_qr" class="qr-code"></div>
        </div>
        <div class="info-box">
            <label>Mnemonic Seed (SECRET)</label>
            <span id="secret">Click Generate to create wallet</span>
            <div id="secret_qr" class="qr-code"></div>
        </div>
    </div>
    <script>
        // Utility: RIPEMD160
        async function ripemd160(buffer) {
            if (typeof window.crypto.subtle === 'undefined') {
                alert('Browser does not support crypto.subtle');
                return null;
            }
            // Use a library for RIPEMD160. Here we use 'hash.js' if available.
            if (typeof hash !== 'undefined' && hash.ripemd160) {
                return new Uint8Array(hash.ripemd160().update(buffer).digest());
            } else {
                alert('RIPEMD160 is required (try hash.js)');
                return null;
            }
        }

        // Utility: Bech32 encode
        function toWords(bytes) {
            // from bech32 library
            return bech32.bech32.toWords(bytes);
        }

        function hexToUint8Array(hex) {
            if (hex.startsWith('0x')) hex = hex.slice(2);
            if (hex.length % 2 !== 0) hex = '0' + hex;
            const arr = [];
            for (let i = 0; i < hex.length; i += 2) {
                arr.push(parseInt(hex.substring(i, i + 2), 16));
            }
            return new Uint8Array(arr);
        }

        async function generate() {
            if (typeof elliptic === 'undefined' || typeof bech32 === 'undefined' || typeof bip39 === 'undefined') {
                alert('A required library is not loaded!');
                return;
            }
            // 1. Generate mnemonic
            const mnemonic = bip39.generateMnemonic(256); // 24-word phrase
            // 2. Get seed from mnemonic
            const seed = bip39.mnemonicToSeedSync(mnemonic); // Buffer
            // 3. Use first 32 bytes as private key
            const privKeyHex = Array.from(seed.slice(0, 32)).map(x => x.toString(16).padStart(2, '0')).join('');
            const ec = new elliptic.ec('secp256k1');
            const key = ec.keyFromPrivate(privKeyHex, 'hex');
            const pub = key.getPublic(true, 'hex'); // compressed public key hex
            const pubBytes = hexToUint8Array(pub);

            // Hash: SHA256 then RIPEMD160
            const sha256 = await window.crypto.subtle.digest('SHA-256', pubBytes);
            const sha256Bytes = new Uint8Array(sha256);

            // RIPEMD160 (needs hash.js library)
            let ripemdBytes = await ripemd160(sha256Bytes);
            if (!ripemdBytes) {
                document.getElementById('public').textContent = 'RIPEMD160 is not available. Add hash.js for full support.';
                return;
            }

            // Bech32 encode
            const words = toWords(ripemdBytes);
            const address = bech32.bech32.encode('bnb', words);

            // DOM elements
            const publicElem = document.getElementById("public");
            const mnemonicElem = document.getElementById("secret");
            const publicQRElem = document.getElementById("public_qr");
            const mnemonicQRElem = document.getElementById("secret_qr");

            if (publicElem && mnemonicElem && publicQRElem && mnemonicQRElem) {
                publicElem.textContent = address;
                mnemonicElem.textContent = mnemonic;

                publicQRElem.innerHTML = "";
                mnemonicQRElem.innerHTML = "";

                new QRCode(publicQRElem, {
                    text: address,
                    width: 100,
                    height: 100,
                    colorDark: "#e0e0e0",
                    colorLight: "#1e1e1e",
                    correctLevel: QRCode.CorrectLevel.H
                });

                new QRCode(mnemonicQRElem, {
                    text: mnemonic,
                    width: 100,
                    height: 100,
                    colorDark: "#e0e0e0",
                    colorLight: "#1e1e1e",
                    correctLevel: QRCode.CorrectLevel.H
                });
            }
        }
    </script>
</body>
</html>