Core/Authserver: Authserver cleanup (PR#25093)

- Fix a handful of 1/256 bugs with most significant byte zero in BigNumber
- Get rid of (most of) the C-style arrays in authserver
- CryptoRandom as a unified source for cryptographic randomness
- Bring our other crypto APIs into 2020
- BigNumber usability improvements
- Authserver is now actually readable as a result of all of the above

(cherry picked from commit 210176fd915cf4ba16f428d3c1a249a71f4aa7a7)

1 files changed, 52 insertions, 0 deletions

diff --git a/src/common/Utilities/advstd.h b/src/common/Utilities/advstd.h
new file mode 100644
index 00000000000..7514f156050
--- /dev/null
+++ b/src/common/Utilities/advstd.h
@@ -0,0 +1,52 @@
+/*
+ * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TRINITY_ADVSTD_H
+#define TRINITY_ADVSTD_H
+
+#include <cstddef>
+#include <initializer_list>
+#include <type_traits>
+
+// this namespace holds implementations of upcoming stdlib features that our c++ version doesn't have yet
+namespace advstd
+{
+    // C++17 std::size
+    template <typename C>
+    constexpr auto size(const C& c) { return c.size(); }
+
+    template <typename T, std::size_t N>
+    constexpr std::size_t size(const T(&)[N]) noexcept { return N; }
+
+    // C++17 std::data
+    template <typename C>
+    constexpr auto data(C& c) { return c.data(); }
+
+    template <typename C>
+    constexpr auto data(C const& c) { return c.data(); }
+
+    template <typename T, std::size_t N>
+    constexpr T* data(T(&a)[N]) noexcept { return a; }
+
+    template <typename T, std::size_t N>
+    constexpr T const* data(const T(&a)[N]) noexcept { return a; }
+
+    template <typename T>
+    constexpr T const* data(std::initializer_list<T> l) noexcept { return l.begin(); }
+}
+
+#endif