From ac43c2c0fd8f68662ad9590f253b416350d926ad Mon Sep 17 00:00:00 2001
From: "James E. King, III" <jking@apache.org>
Date: Wed, 20 Sep 2017 11:12:43 -0400
Subject: [PATCH] add bcrypt support for RNG

This fixes #47
---
 include/boost/detail/winapi/bcrypt.hpp | 74 ++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 include/boost/detail/winapi/bcrypt.hpp

diff --git a/include/boost/detail/winapi/bcrypt.hpp b/include/boost/detail/winapi/bcrypt.hpp
new file mode 100644
index 0000000..fdd3bb4
--- /dev/null
+++ b/include/boost/detail/winapi/bcrypt.hpp
@@ -0,0 +1,74 @@
+//  bcrypt.hpp  --------------------------------------------------------------//
+
+//  Copyright 2017 James E. King, III
+
+//  Distributed under the Boost Software License, Version 1.0.
+//  See http://www.boost.org/LICENSE_1_0.txt
+
+#ifndef BOOST_DETAIL_WINAPI_BCRYPT_HPP
+#define BOOST_DETAIL_WINAPI_BCRYPT_HPP
+
+#include <boost/detail/winapi/basic_types.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+#if BOOST_WINAPI_PARTITION_APP_SYSTEM
+#if defined(BOOST_WINAPI_IS_MINGW_W64) || (BOOST_USE_WINAPI_VERSION >= BOOST_WINAPI_VERSION_VISTA)
+
+#if defined(BOOST_USE_WINDOWS_H)
+#include <bcrypt.h>
+#else
+
+namespace boost { namespace detail { namespace winapi {
+    typedef PVOID_ BCRYPT_ALG_HANDLE_;
+}}}
+
+extern "C" {
+boost::detail::winapi::NTSTATUS_ WINAPI
+    BCryptCloseAlgorithmProvider(
+        boost::detail::winapi::BCRYPT_ALG_HANDLE_ hAlgorithm,
+        boost::detail::winapi::ULONG_             dwFlags
+    );
+
+boost::detail::winapi::NTSTATUS_ WINAPI
+    BCryptGenRandom(
+        boost::detail::winapi::BCRYPT_ALG_HANDLE_ hAlgorithm,
+        boost::detail::winapi::PUCHAR_            pbBuffer,
+        boost::detail::winapi::ULONG_             cbBuffer,
+        boost::detail::winapi::ULONG_             dwFlags
+    );
+
+boost::detail::winapi::NTSTATUS_ WINAPI
+    BCryptOpenAlgorithmProvider(
+        boost::detail::winapi::BCRYPT_ALG_HANDLE_ *phAlgorithm,
+        boost::detail::winapi::LPCWSTR_           pszAlgId,
+        boost::detail::winapi::LPCWSTR_           pszImplementation,
+        boost::detail::winapi::DWORD_             dwFlags
+    );
+} // extern "C"
+#endif // !BOOST_USE_WINDOWS_H
+
+namespace boost {
+namespace detail {
+namespace winapi {
+
+#if defined(BOOST_USE_WINDOWS_H)
+    typedef ::BCRYPT_ALG_HANDLE BCRYPT_ALG_HANDLE_;
+    const LPCWSTR_ BCRYPT_RNG_ALGORITHM_ = BCRYPT_RNG_ALGORITHM;
+#else
+    const LPCWSTR_ BCRYPT_RNG_ALGORITHM_ = L"RNG";
+#endif
+
+using ::BCryptCloseAlgorithmProvider;
+using ::BCryptGenRandom;
+using ::BCryptOpenAlgorithmProvider;
+
+} // winapi
+} // detail
+} // boost
+
+#endif // defined(BOOST_WINAPI_IS_MINGW_W64) || (BOOST_USE_WINAPI_VERSION >= BOOST_WINAPI_VERSION_VISTA)
+#endif // BOOST_WINAPI_PARTITION_APP_SYSTEM
+#endif // BOOST_DETAIL_WINAPI_BCRYPT_HPP