From 86f0fde6e7914f055c5872bf7f2f565cc09977fc Mon Sep 17 00:00:00 2001
From: Mounir IDRASSI <mounir.idrassi@idrix.fr>
Date: Tue, 12 Feb 2019 18:49:12 +0100
Subject: Windows: Use Hardware RNG based on CPU timing jitter "Jitterentropy"
 by Stephan Mueller as a good alternative to RDRAND
 (http://www.chronox.de/jent.html, smueller@chronox.de)

---
 src/Crypto/cpu.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'src/Crypto/cpu.h')

diff --git a/src/Crypto/cpu.h b/src/Crypto/cpu.h
index 9fac453b..12576b47 100644
--- a/src/Crypto/cpu.h
+++ b/src/Crypto/cpu.h
@@ -25,6 +25,23 @@
 	#define ATT_NOPREFIX
 #endif
 
+#if CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64
+#if defined(TC_WINDOWS_DRIVER) || defined (_UEFI)
+#if defined(__cplusplus)
+extern "C" {
+#endif
+extern unsigned __int64 __rdtsc();
+#if defined(__cplusplus)
+}
+#endif
+#else
+#include <intrin.h>
+#ifdef _MSC_VER
+#pragma intrinsic(__rdtsc)
+#endif
+#endif
+#endif
+
 #ifdef CRYPTOPP_GENERATE_X64_MASM
 
 #define CRYPTOPP_X86_ASM_AVAILABLE
-- 
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