feat(Core/DB/Authserver): remove sha_pass_hash (#4827)

src/common/Cryptography/SessionKeyGenerator.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU AGPL v3 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-AGPL3
+ * Copyright (C) 2008-2021 TrinityCore <http://www.trinitycore.org/>
+ */
+
+#include <cstring>
+#include "CryptoHash.h"
+
+#ifndef AZEROTHCORE_SESSIONKEYGENERATOR_HPP
+#define AZEROTHCORE_SESSIONKEYGENERATOR_HPP
+
+template <typename Hash>
+class SessionKeyGenerator
+{
+    public:
+        template <typename C>
+        SessionKeyGenerator(C const& buf) :
+            o0it(o0.begin())
+        {
+            uint8 const* data = std::data(buf);
+            size_t const len = std::size(buf);
+            size_t const halflen = (len / 2);
+
+            o1 = Hash::GetDigestOf(data, halflen);
+            o2 = Hash::GetDigestOf(data + halflen, len - halflen);
+            o0 = Hash::GetDigestOf(o1, o0, o2);
+        }
+
+        void Generate(uint8* buf, uint32 sz)
+        {
+            for (uint32 i = 0; i < sz; ++i)
+            {
+                if (o0it == o0.end())
+                {
+                    o0 = Hash::GetDigestOf(o1, o0, o2);
+                    o0it = o0.begin();
+                }
+
+                buf[i] = *(o0it++);
+            }
+        }
+
+    private:
+        typename Hash::Digest o0 = { };
+        typename Hash::Digest o1 = { };
+        typename Hash::Digest o2 = { };
+        typename Hash::Digest::const_iterator o0it;
+    };
+
+#endif