1 files changed, 79 insertions, 0 deletions
diff --git a/boost/uuid/detail/random_provider_bcrypt.ipp b/boost/uuid/detail/random_provider_bcrypt.ipp
new file mode 100644
index 0000000000..8fedf67b53
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+++ b/boost/uuid/detail/random_provider_bcrypt.ipp
@@ -0,0 +1,79 @@
+//
+// Copyright (c) 2017 James E. King III
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+//   http://www.boost.org/LICENCE_1_0.txt)
+//
+// BCrypt provider for entropy
+//
+
+#include <boost/core/ignore_unused.hpp>
+#include <boost/numeric/conversion/cast.hpp>
+#include <boost/winapi/bcrypt.hpp>
+#include <boost/winapi/get_last_error.hpp>
+#include <boost/throw_exception.hpp>
+
+#if defined(BOOST_UUID_FORCE_AUTO_LINK) || (!defined(BOOST_ALL_NO_LIB) && !defined(BOOST_UUID_RANDOM_PROVIDER_NO_LIB))
+#   define BOOST_LIB_NAME "bcrypt"
+#   define BOOST_AUTO_LINK_NOMANGLE
+#   include <boost/config/auto_link.hpp>
+#   undef BOOST_AUTO_LINK_NOMANGLE
+#endif
+
+namespace boost {
+namespace uuids {
+namespace detail {
+
+class random_provider_base
+{
+  public:
+    random_provider_base()
+      : hProv_(NULL)
+    {
+        boost::winapi::NTSTATUS_ status =
+            boost::winapi::BCryptOpenAlgorithmProvider(
+                &hProv_, 
+                boost::winapi::BCRYPT_RNG_ALGORITHM_,
+                NULL,
+                0);
+
+        if (status)
+        {
+            BOOST_THROW_EXCEPTION(entropy_error(status, "BCryptOpenAlgorithmProvider"));
+        }
+    }
+
+    ~random_provider_base() BOOST_NOEXCEPT
+    {
+        if (hProv_)
+        {
+            ignore_unused(boost::winapi::BCryptCloseAlgorithmProvider(hProv_, 0));
+        }
+    }
+
+    //! Obtain entropy and place it into a memory location
+    //! \param[in]  buf  the location to write entropy
+    //! \param[in]  siz  the number of bytes to acquire
+    void get_random_bytes(void *buf, size_t siz)
+    {
+        boost::winapi::NTSTATUS_ status =
+            boost::winapi::BCryptGenRandom(
+                hProv_,
+                static_cast<boost::winapi::PUCHAR_>(buf),
+                boost::numeric_cast<boost::winapi::ULONG_>(siz),
+                0);
+
+        if (status)
+        {
+            BOOST_THROW_EXCEPTION(entropy_error(status, "BCryptGenRandom"));
+        }
+    }
+
+  private:
+    boost::winapi::BCRYPT_ALG_HANDLE_ hProv_;
+};
+
+} // detail
+} // uuids
+} // boost