1 files changed, 48 insertions, 0 deletions
diff --git a/src/libs/3rdparty/botan/src/lib/entropy/rdseed/rdseed.cpp b/src/libs/3rdparty/botan/src/lib/entropy/rdseed/rdseed.cpp
new file mode 100644
index 0000000000..fbb8f921e7
--- /dev/null
+++ b/src/libs/3rdparty/botan/src/lib/entropy/rdseed/rdseed.cpp
@@ -0,0 +1,48 @@
+/*
+* Entropy Source Using Intel's rdseed instruction
+* (C) 2015 Jack Lloyd, Daniel Neus
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/internal/rdseed.h>
+#include <botan/cpuid.h>
+
+#if !defined(BOTAN_USE_GCC_INLINE_ASM)
+  #include <immintrin.h>
+#endif
+
+namespace Botan {
+
+BOTAN_FUNC_ISA("rdseed")
+size_t Intel_Rdseed::poll(RandomNumberGenerator& rng) {
+   if(CPUID::has_rdseed())
+      {
+      for(size_t p = 0; p != BOTAN_ENTROPY_INTEL_RNG_POLLS; ++p)
+         {
+         for(size_t i = 0; i != BOTAN_ENTROPY_RDSEED_RETRIES; ++i)
+            {
+            uint32_t r = 0;
+
+#if defined(BOTAN_USE_GCC_INLINE_ASM)
+            int cf = 0;
+
+            // Encoding of rdseed %eax
+            asm(".byte 0x0F, 0xC7, 0xF8; adcl $0,%1" :
+                "=a" (r), "=r" (cf) : "0" (r), "1" (cf) : "cc");
+#else
+            int cf = _rdseed32_step(&r);
+#endif
+            if(1 == cf)
+               {
+               rng.add_entropy_T(r);
+               break;
+               }
+            }
+         }
+      }
+
+   return 0;
+   }
+
+}