1 files changed, 153 insertions, 0 deletions
diff --git a/src/common/Cryptography/HMAC.h b/src/common/Cryptography/HMAC.h
new file mode 100644
index 00000000000..8562d3b5e2e
--- /dev/null
+++ b/src/common/Cryptography/HMAC.h
@@ -0,0 +1,153 @@
+/*
+ * 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_HMAC_H
+#define TRINITY_HMAC_H
+
+#include "CryptoConstants.h"
+#include "Define.h"
+#include "Errors.h"
+#include <array>
+#include <string>
+//#include <string_view>
+#include <openssl/hmac.h>
+#include "advstd.h"
+
+class BigNumber;
+
+namespace Trinity
+{
+namespace Impl
+{
+    struct HMACImpl
+    {
+        typedef EVP_MD const* (*HashCreator)();
+
+#if defined(OPENSSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER < 0x10100000L
+        static HMAC_CTX* MakeCTX()
+        {
+            HMAC_CTX* ctx = new HMAC_CTX();
+            HMAC_CTX_init(ctx);
+            return ctx;
+        }
+
+        static void DestroyCTX(HMAC_CTX* ctx)
+        {
+            HMAC_CTX_cleanup(ctx);
+            delete ctx;
+        }
+#else
+        static HMAC_CTX* MakeCTX() { return HMAC_CTX_new(); }
+        static void DestroyCTX(HMAC_CTX* ctx) { HMAC_CTX_free(ctx); }
+#endif
+    };
+
+    template <HMACImpl::HashCreator HashCreator, size_t DigestLength>
+    class GenericHMAC
+    {
+        public:
+            static constexpr size_t DIGEST_LENGTH = DigestLength;
+            using Digest = std::array<uint8, DIGEST_LENGTH>;
+
+            template <typename Container>
+            static Digest GetDigestOf(Container const& seed, uint8 const* data, size_t len)
+            {
+                GenericHMAC hash(seed);
+                hash.UpdateData(data, len);
+                hash.Finalize();
+                return hash.GetDigest();
+            }
+
+        private: // c++17
+            template <typename T>
+            static void UpdateData_OLDCPP(GenericHMAC& hash, T const& data)
+            {
+                hash.UpdateData(data);
+            }
+
+            template <typename T, typename... TRest>
+            static void UpdateData_OLDCPP(GenericHMAC& hash, T const& data, TRest&&... rest)
+            {
+                hash.UpdateData(data);
+                UpdateData_OLDCPP(hash, std::forward<TRest>(rest)...);
+            }
+
+        public:
+            template <typename Container, typename... Ts>
+            static auto GetDigestOf(Container const& seed, Ts&&... pack) -> /*std::enable_if_t<!(std::is_integral_v<std::decay_t<Ts>> || ...),*/ Digest/*>*/
+            {
+                GenericHMAC hash(seed);
+                UpdateData_OLDCPP(hash, std::forward<Ts>(pack)...);
+                hash.Finalize();
+                return hash.GetDigest();
+            }
+
+            GenericHMAC(uint8 const* seed, size_t len) : _ctx(HMACImpl::MakeCTX())
+            {
+                int result = HMAC_Init_ex(_ctx, seed, len, HashCreator(), nullptr);
+                ASSERT(result == 1);
+            }
+            template <typename Container>
+            GenericHMAC(Container const& container) : GenericHMAC(container.data(), container.size()) {}
+
+            ~GenericHMAC()
+            {
+                if (!_ctx)
+                    return;
+                HMACImpl::DestroyCTX(_ctx);
+                _ctx = nullptr;
+            }
+
+            void UpdateData(uint8 const* data, size_t len)
+            {
+                int result = HMAC_Update(_ctx, data, len);
+                ASSERT(result == 1);
+            }
+            // c++17 void UpdateData(std::string_view str) { UpdateData(reinterpret_cast<uint8 const*>(str.data()), str.size()); }
+            void UpdateData(std::string const& str) { UpdateData(str.c_str()); } /* explicit overload to avoid using the container template */
+            void UpdateData(char const* str) { UpdateData(reinterpret_cast<uint8 const*>(str), strlen(str)); } /* explicit overload to avoid using the container template */
+            template <typename Container>
+            void UpdateData(Container const& c) { UpdateData(advstd::data(c), advstd::size(c)); }
+
+            void Finalize()
+            {
+                uint32 length = 0;
+                int result = HMAC_Final(_ctx, _digest.data(), &length);
+                ASSERT(result == 1);
+                ASSERT(length == DIGEST_LENGTH);
+                HMACImpl::DestroyCTX(_ctx);
+                _ctx = nullptr;
+            }
+
+            Digest const& GetDigest() const { return _digest; }
+        private:
+            HMAC_CTX* _ctx;
+            Digest _digest = { };
+    };
+}
+}
+
+namespace Trinity
+{
+namespace Crypto
+{
+    using HMAC_SHA1 = Trinity::Impl::GenericHMAC<EVP_sha1, Constants::SHA1_DIGEST_LENGTH_BYTES>;
+    using HMAC_SHA256 = Trinity::Impl::GenericHMAC<EVP_sha256, Constants::SHA256_DIGEST_LENGTH_BYTES>;
+}
+}
+
+#endif