From 744354c5508181f267fbb0ff4cc847a9fc42b677 Mon Sep 17 00:00:00 2001
From: Jonathan White <support@dmapps.us>
Date: Sat, 26 Oct 2019 14:55:26 -0400
Subject: [PATCH] Reduce default Argon2 memory and thread settings (#3672)

* Fix #3550
* Default memory reduced to 64 MiB (from 128 MiB) and parallelism reduced to 2 threads. This allows for desktop and mobile device compatibility.
---
 src/gui/dbsettings/DatabaseSettingsWidgetEncryption.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/gui/dbsettings/DatabaseSettingsWidgetEncryption.cpp b/src/gui/dbsettings/DatabaseSettingsWidgetEncryption.cpp
index e5bd08a1..e2a8cdaf 100644
--- a/src/gui/dbsettings/DatabaseSettingsWidgetEncryption.cpp
+++ b/src/gui/dbsettings/DatabaseSettingsWidgetEncryption.cpp
@@ -400,8 +400,10 @@ void DatabaseSettingsWidgetEncryption::updateFormatCompatibility(int index, bool
 
         if (kdf->uuid() == KeePass2::KDF_ARGON2) {
             auto argon2Kdf = kdf.staticCast<Argon2Kdf>();
-            argon2Kdf->setMemory(128 * 1024);
-            argon2Kdf->setParallelism(static_cast<quint32>(QThread::idealThreadCount()));
+            // Default to 64 MiB of memory and 2 threads
+            // these settings are safe for desktop and mobile devices
+            argon2Kdf->setMemory(1 << 16);
+            argon2Kdf->setParallelism(2);
         }
 
         activateChangeDecryptionTime();