From c41018bc5a7369786fde903ad7d49756a578c3e7 Mon Sep 17 00:00:00 2001
From: SChernykh <15806605+SChernykh@users.noreply.github.com>
Date: Tue, 21 Oct 2025 09:32:01 +0200
Subject: [PATCH] Util: fixed undefined behavior

---
 src/util.cpp | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/util.cpp b/src/util.cpp
index 9d435ac..5d22dfc 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -1017,9 +1017,7 @@ hash from_onion_v3(const std::string& address)
 
 	// Convert address to lowercase
 	std::string s = address;
-	for (char& c : s) {
-		c = static_cast<char>(std::tolower(c));
-	}
+	std::transform(s.begin(), s.end(), s.begin(), [](unsigned char c) { return static_cast<char>(std::tolower(c)); });
 
 	// Checksum validation
 	if (to_onion_v3(result) != s) {