3e9483e222
File stays AES-GCM encrypted with a fixed app-internal key — opaque without the app, which is the only protection we actually need for locally-stored API keys. Removes the modal and both password dialogs.
82 lines
2.4 KiB
JavaScript
82 lines
2.4 KiB
JavaScript
const crypto = require('crypto');
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const MAGIC = Buffer.from('MHU1');
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const SALT_LEN = 16;
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const IV_LEN = 12;
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const TAG_LEN = 16;
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const KEY_LEN = 32;
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const ITERATIONS = 100_000;
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const DIGEST = 'sha512';
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const ALGO = 'aes-256-gcm';
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// Fixed app-internal passphrase — backups are opaque without the app, which is
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// enough protection for API keys stored locally. We keep the AES-GCM envelope
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// (with random salt/iv) so each export is still distinct and authenticated.
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const APP_PASSPHRASE = 'multi-hoster-upload::backup::v1';
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function deriveKey(salt) {
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return crypto.pbkdf2Sync(APP_PASSPHRASE, salt, ITERATIONS, KEY_LEN, DIGEST);
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}
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/**
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* Encrypt a config object.
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* Returns a Buffer: MHU1 | salt(16) | iv(12) | tag(16) | ciphertext
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*/
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function encrypt(config) {
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const plaintext = Buffer.from(JSON.stringify(config), 'utf-8');
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const salt = crypto.randomBytes(SALT_LEN);
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const iv = crypto.randomBytes(IV_LEN);
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const key = deriveKey(salt);
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const cipher = crypto.createCipheriv(ALGO, key, iv);
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const encrypted = Buffer.concat([cipher.update(plaintext), cipher.final()]);
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const tag = cipher.getAuthTag();
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plaintext.fill(0);
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key.fill(0);
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return Buffer.concat([MAGIC, salt, iv, tag, encrypted]);
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}
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/**
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* Decrypt a .mhu buffer.
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* Returns the config object or throws on invalid data.
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*/
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function decrypt(buffer) {
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if (buffer.length < MAGIC.length + SALT_LEN + IV_LEN + TAG_LEN + 1) {
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throw new Error('Ungültiges Backup-Format');
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}
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const magic = buffer.subarray(0, 4);
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if (!magic.equals(MAGIC)) {
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throw new Error('Keine gültige .mhu Backup-Datei');
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}
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let offset = MAGIC.length;
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const salt = buffer.subarray(offset, offset += SALT_LEN);
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const iv = buffer.subarray(offset, offset += IV_LEN);
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const tag = buffer.subarray(offset, offset += TAG_LEN);
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const ciphertext = buffer.subarray(offset);
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const key = deriveKey(salt);
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const decipher = crypto.createDecipheriv(ALGO, key, iv);
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decipher.setAuthTag(tag);
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let decrypted;
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try {
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decrypted = Buffer.concat([decipher.update(ciphertext), decipher.final()]);
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} catch {
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throw new Error('Backup-Datei beschädigt oder aus einer inkompatiblen Version');
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}
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try {
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return JSON.parse(decrypted.toString('utf-8'));
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} catch {
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throw new Error('Entschlüsselte Daten sind kein gültiges JSON');
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} finally {
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decrypted.fill(0);
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key.fill(0);
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}
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}
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module.exports = { encrypt, decrypt };
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