From a574b43eb81a7792f2e7cdba1051e69f699f414e Mon Sep 17 00:00:00 2001
From: Adriaan de Groot <groot@kde.org>
Date: Wed, 29 Jan 2020 16:08:33 +0100
Subject: [PATCH] [libcalamares] Also report empty buffer as no-entropy

---
 src/libcalamares/utils/Entropy.cpp | 5 +++++
 src/libcalamares/utils/Entropy.h   | 1 +
 2 files changed, 6 insertions(+)

diff --git a/src/libcalamares/utils/Entropy.cpp b/src/libcalamares/utils/Entropy.cpp
index adba7478c..21ee25115 100644
--- a/src/libcalamares/utils/Entropy.cpp
+++ b/src/libcalamares/utils/Entropy.cpp
@@ -26,6 +26,11 @@ CalamaresUtils::EntropySource
 CalamaresUtils::getEntropy( int size, QByteArray& b )
 {
     b.clear();
+    if ( size < 1)
+    {
+        return EntropySource::None;
+    }
+
     b.resize( size );
     char* buffer = b.data();
     std::fill( buffer, buffer + size, 0xcb );
diff --git a/src/libcalamares/utils/Entropy.h b/src/libcalamares/utils/Entropy.h
index da2236266..2983e0e24 100644
--- a/src/libcalamares/utils/Entropy.h
+++ b/src/libcalamares/utils/Entropy.h
@@ -28,6 +28,7 @@ namespace CalamaresUtils
 /// @brief Which entropy source was actually used for the entropy.
 enum class EntropySource
 {
+    None,  ///< Buffer is empty, no random data
     URandom,  ///< Read from /dev/urandom
     Twister  ///< Generated by pseudo-random
 };