From 8335db4db5556e918d5e8a321944d3b16d32f638 Mon Sep 17 00:00:00 2001
From: Felix Geyer <debfx@fobos.de>
Date: Fri, 8 Jul 2011 14:40:42 +0200
Subject: [PATCH] Add Random::randomUInt() and Random::randomUIntRange().

---
 src/crypto/Random.cpp | 19 ++++++++++++++++++-
 src/crypto/Random.h   | 11 +++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/src/crypto/Random.cpp b/src/crypto/Random.cpp
index 0d6d77168..d84106ec0 100644
--- a/src/crypto/Random.cpp
+++ b/src/crypto/Random.cpp
@@ -21,7 +21,7 @@
 
 void Random::randomize(QByteArray& ba)
 {
-    gcry_randomize(ba.data(), ba.size(), GCRY_STRONG_RANDOM);
+    randomize(ba.data(), ba.size());
 }
 
 QByteArray Random::randomArray(int len)
@@ -34,6 +34,23 @@ QByteArray Random::randomArray(int len)
     return ba;
 }
 
+quint32 Random::randomUInt(quint32 limit)
+{
+    quint32 rand;
+    randomize(&rand, 4);
+    return (rand % limit);
+}
+
+quint32 Random::randomUIntRange(quint32 min, quint32 max)
+{
+    return min + randomUInt(max - min);
+}
+
+void Random::randomize(void* data, int len)
+{
+    gcry_randomize(data, len, GCRY_STRONG_RANDOM);
+}
+
 Random::Random()
 {
 }
diff --git a/src/crypto/Random.h b/src/crypto/Random.h
index a93f5a3c7..987ba6fd7 100644
--- a/src/crypto/Random.h
+++ b/src/crypto/Random.h
@@ -26,7 +26,18 @@ public:
     static void randomize(QByteArray& ba);
     static QByteArray randomArray(int len);
 
+    /**
+     * Generate a random quint32 in the range [0, @p limit)
+     */
+    static quint32 randomUInt(quint32 limit);
+
+    /**
+     * Generate a random quint32 in the range [@p min, @p max)
+     */
+    static quint32 randomUIntRange(quint32 min, quint32 max);
+
 private:
+    static void randomize(void* data, int len);
     Random();
 };