From 425a6329655b48c0aab972971bd4ac9d41ee17d3 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Fri, 11 Jun 2021 13:03:00 +0400
Subject: [PATCH] Accept DD / EE as proxy type tag.

Fixes #16218.
---
 Telegram/SourceFiles/mtproto/mtproto_proxy_data.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Telegram/SourceFiles/mtproto/mtproto_proxy_data.cpp b/Telegram/SourceFiles/mtproto/mtproto_proxy_data.cpp
index cb401a589a..1a031b5618 100644
--- a/Telegram/SourceFiles/mtproto/mtproto_proxy_data.cpp
+++ b/Telegram/SourceFiles/mtproto/mtproto_proxy_data.cpp
@@ -30,9 +30,11 @@ namespace {
 [[nodiscard]] ProxyData::Status HexMtprotoPasswordStatus(
 		const QString &password) {
 	const auto size = password.size() / 2;
+	const auto type1 = password[0].toLower();
+	const auto type2 = password[1].toLower();
 	const auto valid = (size == 16)
-		|| (size == 17 && (password[0] == 'd') && (password[1] == 'd'))
-		|| (size >= 21 && (password[0] == 'e') && (password[1] == 'e'));
+		|| (size == 17 && (type1 == 'd') && (type2 == 'd'))
+		|| (size >= 21 && (type1 == 'e') && (type2 == 'e'));
 	if (valid) {
 		return ProxyData::Status::Valid;
 	} else if (size < 16) {