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offline encrypter tool
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‎Offline_Encryption_Tool/encrypter_encrypter.html‎

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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>EncrypterMod — Offline AES-GCM Encryptor</title>
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<meta name="viewport" content="width=device-width,initial-scale=1" />
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<style>
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body{font-family:system-ui, -apple-system, "Segoe UI", Roboto, Arial;max-width:900px;margin:24px auto;padding:0 18px;color:#111}
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label{display:block;margin-top:12px;font-weight:600}
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input, textarea, select{width:100%;padding:8px;margin-top:6px;border-radius:6px;border:1px solid #ddd;box-sizing:border-box}
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button{padding:10px 14px;border-radius:8px;border:0;background:#0b6efd;color:#fff;font-weight:600;cursor:pointer;margin-top:10px}
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pre{background:#f6f8fa;padding:12px;border-radius:8px;overflow:auto;white-space:pre-wrap;word-break:break-word}
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.row{display:flex;gap:10px}
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.col{flex:1}
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.note{color:#666;font-size:13px}
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</style>
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</head>
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<body>
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<h1>EncrypterMod — Offline AES-GCM Encryptor</h1>
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<p class="note">Encrypts plaintext into IV+ciphertext+tag blob compatible with the mod/decryptor. Works fully offline in the browser.</p>
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<label>Username (used in ID)</label>
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<input id="username" placeholder="yourname123">
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<label>Key format</label>
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<select id="keyFormat">
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<option value="text">Raw text key (UTF-8) — paste exactly what's in config/key.json</option>
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<option value="base64">Base64 key (URL-safe or normal)</option>
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</select>
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<label>Key</label>
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<input id="keyInput" type="password" placeholder="Paste AES key (raw text or base64)">
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<label>Message to encrypt</label>
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<textarea id="plaintext" rows="4" placeholder="Type message here..."></textarea>
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<div style="margin-top:10px">
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<button id="genKey">Generate random 32-byte key (Base64)</button>
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<button id="encryptBtn">Encrypt & Generate Chat Line</button>
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<button id="clearBtn" style="background:#6c757d;margin-left:8px">Clear</button>
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</div>
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<div id="outputArea" style="margin-top:14px;display:none">
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<label>Chat line (copy this into Minecraft chat)</label>
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<pre id="outputPre"></pre>
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<button id="copyBtn">Copy to clipboard</button>
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</div>
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<div class="note" style="margin-top:12px">
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IMPORTANT: If your mod key in <code>config/encrypter/key.json</code> is a textual string like <code>1234567890abcdef1234567890abcdef</code>, choose <strong>Raw text key</strong> and paste that exact string. Do not paste screenshots / OCR text.
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</div>
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<script>
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/* helpers */
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function uint8ToBase64Url(uint8) {
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// safe conversion -> use chunks to avoid call limit
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let CHUNK = 0x8000;
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let index = 0;
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let result = '';
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while (index < uint8.length) {
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let slice = uint8.subarray(index, Math.min(index + CHUNK, uint8.length));
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result += String.fromCharCode.apply(null, slice);
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index += CHUNK;
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}
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let b64 = btoa(result);
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return b64.replace(/\+/g,'-').replace(/\//g,'_').replace(/=+$/,'');
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}
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function base64UrlToUint8(base64Url) {
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let b64 = base64Url.replace(/-/g,'+').replace(/_/g,'/');
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while (b64.length % 4 !== 0) b64 += '=';
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const binary = atob(b64);
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const len = binary.length;
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const bytes = new Uint8Array(len);
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for (let i = 0; i < len; i++) bytes[i] = binary.charCodeAt(i);
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return bytes;
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}
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function hexToUint8(hex) {
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hex = hex.replace(/\s+/g,'');
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if (hex.length % 2 !== 0) throw new Error('Invalid hex length');
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const arr = new Uint8Array(hex.length/2);
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for (let i=0;i<hex.length;i+=2) arr[i/2] = parseInt(hex.substring(i,i+2),16);
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return arr;
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}
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function uuidv4() {
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// crypto-based v4
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return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g,c=>{
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const r = crypto.getRandomValues(new Uint8Array(1))[0] & 15;
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const v = c === 'x' ? r : (r & 0x3 | 0x8);
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return v.toString(16);
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});
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}
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/* import key helpers */
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async function importKeyFromInput(keyStr, format) {
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let keyBytes;
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if (format === 'text') {
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keyBytes = new TextEncoder().encode(keyStr);
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} else { // base64
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keyBytes = base64UrlToUint8(keyStr);
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}
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if (![16,24,32].includes(keyBytes.length)) {
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throw new Error('Key must be 16, 24 or 32 bytes (after decoding). Found: ' + keyBytes.length);
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}
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return crypto.subtle.importKey('raw', keyBytes.buffer, {name:'AES-GCM'}, false, ['encrypt']);
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}
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/* main encrypt function */
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document.getElementById('encryptBtn').addEventListener('click', async () => {
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try {
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const username = document.getElementById('username').value.trim();
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let keyStr = document.getElementById('keyInput').value.trim();
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const format = document.getElementById('keyFormat').value;
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let plaintext = document.getElementById('plaintext').value;
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if (plaintext == null || plaintext.length === 0) throw new Error('Message empty');
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if (!keyStr) throw new Error('No key provided');
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if (!username) throw new Error('Provide username');
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// import key
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const keyObj = await importKeyFromInput(keyStr, format);
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// create IV
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const iv = crypto.getRandomValues(new Uint8Array(12));
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// encrypt (explicit tagLength)
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const enc = new TextEncoder().encode(plaintext);
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const cipherBuffer = await crypto.subtle.encrypt({name:'AES-GCM', iv:iv, tagLength:128}, keyObj, enc);
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const cipherBytes = new Uint8Array(cipherBuffer);
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// compose output IV + ciphertext+tag
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const out = new Uint8Array(iv.length + cipherBytes.length);
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out.set(iv, 0);
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out.set(cipherBytes, iv.length);
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const blob = uint8ToBase64Url(out);
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const id = username + '_' + uuidv4();
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const finalLine = `[EncrypterMod] [ID: ${id}] ${blob}`;
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document.getElementById('outputPre').textContent = finalLine;
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document.getElementById('outputArea').style.display = 'block';
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} catch (e) {
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alert('Error: ' + (e && e.message ? e.message : e));
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}
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});
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/* copy/download/gen key */
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document.getElementById('copyBtn').addEventListener('click', async () => {
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try {
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await navigator.clipboard.writeText(document.getElementById('outputPre').textContent);
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alert('Copied!');
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} catch {
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alert('Clipboard copy failed — select the text and copy manually.');
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}
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});
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document.getElementById('genKey').addEventListener('click', () => {
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const rand = crypto.getRandomValues(new Uint8Array(32));
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const b64 = uint8ToBase64Url(rand);
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document.getElementById('keyFormat').value = 'base64';
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document.getElementById('keyInput').value = b64;
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alert('Generated 32-byte key (Base64). Use Raw text only if your mod uses printable ASCII key.');
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});
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document.getElementById('clearBtn').addEventListener('click', () => {
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document.getElementById('plaintext').value = '';
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document.getElementById('keyInput').value = '';
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document.getElementById('username').value = '';
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document.getElementById('outputArea').style.display = 'none';
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});
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</script>
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</body>
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</html>

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