From: Oliver Kurth <okurth@vmware.com>
Date: Wed, 10 Apr 2019 21:14:56 +0000 (-0700)
Subject: Add a 64 bit pseudo random number generator
X-Git-Tag: stable-11.0.0~131
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8b2bbbd8c2b647592a2f444a678fe93552fb0d22;p=thirdparty%2Fopen-vm-tools.git

Add a 64 bit pseudo random number generator

This change adds a 64 bit pseudo random number generator to the public
library by calling the existing 32 bit Random_Fast function twice.
Since the period of Random_Fast is 2^64, this should be sufficient.
---

diff --git a/open-vm-tools/lib/include/random.h b/open-vm-tools/lib/include/random.h
index 1d09dfdaa..80c5c5f1c 100644
--- a/open-vm-tools/lib/include/random.h
+++ b/open-vm-tools/lib/include/random.h
@@ -1,5 +1,5 @@
 /*********************************************************
- * Copyright (C) 1998-2017 VMware, Inc. All rights reserved.
+ * Copyright (C) 1998-2017,2019 VMware, Inc. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as published
@@ -77,6 +77,7 @@ uint32 Random_Quick(rqContext *context);
  */
 
 uint32 Random_Fast(uint64 *state);
+uint64 Random_Fast64(uint64 *state);
 
 static INLINE void
 Random_FastSeed(uint64 *state,  // OUT:
diff --git a/open-vm-tools/lib/misc/prng.c b/open-vm-tools/lib/misc/prng.c
index 64b7bfdab..d72ba8cef 100644
--- a/open-vm-tools/lib/misc/prng.c
+++ b/open-vm-tools/lib/misc/prng.c
@@ -1,5 +1,5 @@
 /*********************************************************
- * Copyright (C) 1998-2016 VMware, Inc. All rights reserved.
+ * Copyright (C) 1998-2016,2019 VMware, Inc. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as published
@@ -114,6 +114,7 @@ RandomFastImpl(uint64 *rs,  // IN/OUT:
  *-----------------------------------------------------------------------------
  *
  * Random_Fast --
+ * Random_Fast64 --
  * Random_FastStream --
  * Random_FastStreamSeed --
  *
@@ -156,6 +157,12 @@ Random_Fast(uint64 *rs)  // IN/OUT:
    return RandomFastImpl(rs, inc);
 }
 
+uint64
+Random_Fast64(uint64 *rs)  // IN/OUT:
+{
+   return QWORD(Random_Fast(rs), Random_Fast(rs)) ;
+}
+
 uint32
 Random_FastStream(RandomFastContext *rfc)  // IN/OUT:
 {