port dump-db and other tools to TS

dump-db/inc/data_key.ts

@@ -0,0 +1,43 @@
+import crypto from 'crypto';
+import sql from './sql.js';
+import decryptService from './decrypt.js';
+
+function getDataKey(password: any) {
+    if (!password) {
+        return null;
+    }
+
+    try {
+        const passwordDerivedKey = getPasswordDerivedKey(password);
+
+        const encryptedDataKey = getOption('encryptedDataKey');
+
+        const decryptedDataKey = decryptService.decrypt(passwordDerivedKey, encryptedDataKey, 16);
+
+        return decryptedDataKey;
+    }
+    catch (e: any) {
+        throw new Error(`Cannot read data key, the entered password might be wrong. The underlying error: '${e.message}', stack:\n${e.stack}`);
+    }
+}
+
+function getPasswordDerivedKey(password: any) {
+    const salt = getOption('passwordDerivedKeySalt');
+
+    return getScryptHash(password, salt);
+}
+
+function getScryptHash(password: any, salt: any) {
+    const hashed = crypto.scryptSync(password, salt, 32,
+        { N: 16384, r: 8, p: 1 });
+
+    return hashed;
+}
+
+function getOption(name: string) {
+    return sql.getValue("SELECT value FROM options WHERE name = ?", [name]);
+}
+
+export default {
+    getDataKey
+};