56 lines
2.1 KiB
JavaScript
56 lines
2.1 KiB
JavaScript
'use strict';
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const crypto = require('crypto');
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const ALGORITHM = 'aes-256-gcm';
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const IV_BYTES = 12;
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const TAG_BYTES = 16;
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// Returns a stable 256-bit key. Prefers TOKEN_ENCRYPTION_KEY env var (power-user
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// override); otherwise auto-generates a random key on first startup and persists
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// it in the settings table so it survives restarts without any manual config.
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function getKey() {
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const envRaw = process.env.TOKEN_ENCRYPTION_KEY || '';
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if (envRaw) {
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const buf = Buffer.from(envRaw, 'utf8');
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if (buf.length < 32) throw new Error('TOKEN_ENCRYPTION_KEY must be at least 32 bytes');
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return crypto.createHash('sha256').update(buf).digest();
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}
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// Lazy-require to avoid circular dependency at module load time
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const { getSetting, setSetting } = require('../db/database');
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let stored = getSetting('_auto_encryption_key');
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if (!stored) {
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stored = crypto.randomBytes(48).toString('hex');
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setSetting('_auto_encryption_key', stored);
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}
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return crypto.createHash('sha256').update(stored, 'utf8').digest();
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}
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// No-op now that the key is always available — kept for call-site compatibility
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function assertEncryptionReady() {}
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function encryptSecret(plaintext) {
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const key = getKey();
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const iv = crypto.randomBytes(IV_BYTES);
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const cipher = crypto.createCipheriv(ALGORITHM, key, iv, { authTagLength: TAG_BYTES });
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const ct = Buffer.concat([cipher.update(plaintext, 'utf8'), cipher.final()]);
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const tag = cipher.getAuthTag();
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return `${iv.toString('hex')}:${tag.toString('hex')}:${ct.toString('hex')}`;
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}
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function decryptSecret(stored) {
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const parts = stored.split(':');
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if (parts.length !== 3) throw new Error('Invalid encrypted secret format');
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const [ivHex, tagHex, ctHex] = parts;
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const key = getKey();
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const iv = Buffer.from(ivHex, 'hex');
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const tag = Buffer.from(tagHex, 'hex');
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const ct = Buffer.from(ctHex, 'hex');
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const decipher = crypto.createDecipheriv(ALGORITHM, key, iv, { authTagLength: TAG_BYTES });
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decipher.setAuthTag(tag);
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return Buffer.concat([decipher.update(ct), decipher.final()]).toString('utf8');
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}
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module.exports = { assertEncryptionReady, encryptSecret, decryptSecret };
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