1 files changed, 67 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/rng/rdrand_rng/rdrand_rng.cpp b/comm/third_party/botan/src/lib/rng/rdrand_rng/rdrand_rng.cpp
new file mode 100644
index 0000000000..fade5a1992
--- /dev/null
+++ b/comm/third_party/botan/src/lib/rng/rdrand_rng/rdrand_rng.cpp
@@ -0,0 +1,67 @@
+/*
+* RDRAND RNG
+* (C) 2016,2019 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/rdrand_rng.h>
+#include <botan/processor_rng.h>
+#include <botan/loadstor.h>
+
+namespace Botan {
+
+void RDRAND_RNG::randomize(uint8_t out[], size_t out_len)
+   {
+   Processor_RNG rng;
+   rng.randomize(out, out_len);
+   }
+
+RDRAND_RNG::RDRAND_RNG()
+   {
+   // Will throw if instruction is not available
+   Processor_RNG rng;
+   }
+
+//static
+bool RDRAND_RNG::available()
+   {
+   return Processor_RNG::available();
+   }
+
+//static
+uint32_t RDRAND_RNG::rdrand()
+   {
+   Processor_RNG rng;
+
+   for(;;)
+      {
+      try
+         {
+         uint8_t out[4];
+         rng.randomize(out, 4);
+         return load_le<uint32_t>(out, 0);
+         }
+      catch(PRNG_Unseeded&) {}
+      }
+   }
+
+//static
+uint32_t RDRAND_RNG::rdrand_status(bool& ok)
+   {
+   ok = false;
+   Processor_RNG rng;
+
+   try
+      {
+      uint8_t out[4];
+      rng.randomize(out, 4);
+      ok = true;
+      return load_le<uint32_t>(out, 0);
+      }
+   catch(PRNG_Unseeded&) {}
+
+   return 0;
+   }
+
+}