From f34ce07f78961e0881736e6ce6ab150a73c5d8f9 Mon Sep 17 00:00:00 2001
From: Stephan February <stephan.february@token.im>
Date: Tue, 19 Sep 2023 13:55:34 +0800
Subject: [PATCH] Hardened path verification / validation

- Added addtional regex check to the path validation string
- Exposed ChildNumber class in the API
---
 lib/dartsv.dart             | 1 +
 lib/src/crypto/hdutils.dart | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/dartsv.dart b/lib/dartsv.dart
index 68ff5c4..8e90782 100644
--- a/lib/dartsv.dart
+++ b/lib/dartsv.dart
@@ -49,5 +49,6 @@ export 'src/encoding/utils.dart';
 export 'src/encoding/base58check.dart';
 export 'src/crypto/ecies.dart';
 export 'src/crypto/hdutils.dart';
+export 'src/crypto/childnumber.dart';
 
 
diff --git a/lib/src/crypto/hdutils.dart b/lib/src/crypto/hdutils.dart
index 2d418d5..97d8479 100644
--- a/lib/src/crypto/hdutils.dart
+++ b/lib/src/crypto/hdutils.dart
@@ -68,7 +68,11 @@ class HDUtils {
     static List<ChildNumber> parsePath(String path) {
 
         if (!(path.startsWith("m") || path.startsWith("M")))
-            throw new InvalidPathException("Valid paths start with an 'm' or an 'M'");
+            throw InvalidPathException("Valid paths start with an 'm' or an 'M'");
+
+        final regex = RegExp(r"^([mM]\/)?(\d+'?\/)*\d+'?$");
+        if (!regex.hasMatch(path)) throw InvalidPathException("Invalid path expression");
+
 
         path = path.toUpperCase();
         path = path.replaceAll("'", "H");