1 files changed, 119 insertions, 0 deletions
diff --git a/src/common/Cryptography/CryptoHash.h b/src/common/Cryptography/CryptoHash.h
new file mode 100644
index 00000000000..8c9825ce2d8
--- /dev/null
+++ b/src/common/Cryptography/CryptoHash.h
@@ -0,0 +1,119 @@
+/*
+ * 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_CRYPTOHASH_H
+#define TRINITY_CRYPTOHASH_H
+
+#include "CryptoConstants.h"
+#include "Define.h"
+#include "Errors.h"
+#include <array>
+#include <string>
+#include <string_view>
+#include <openssl/evp.h>
+
+class BigNumber;
+
+namespace Trinity::Impl
+{
+    struct GenericHashImpl
+    {
+        typedef EVP_MD const* (*HashCreator)();
+
+#if defined(OPENSSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER < 0x10100000L
+        static EVP_MD_CTX* MakeCTX() { return EVP_MD_CTX_create(); }
+        static void DestroyCTX(EVP_MD_CTX* ctx) { EVP_MD_CTX_destroy(ctx); }
+#else
+        static EVP_MD_CTX* MakeCTX() { return EVP_MD_CTX_new(); }
+        static void DestroyCTX(EVP_MD_CTX* ctx) { EVP_MD_CTX_free(ctx); }
+#endif
+    };
+
+    template <GenericHashImpl::HashCreator HashCreator, size_t DigestLength>
+    class GenericHash
+    {
+        public:
+            static constexpr size_t DIGEST_LENGTH = DigestLength;
+            using Digest = std::array<uint8, DIGEST_LENGTH>;
+
+            static Digest GetDigestOf(uint8 const* data, size_t len)
+            {
+                GenericHash hash;
+                hash.UpdateData(data, len);
+                hash.Finalize();
+                return hash.GetDigest();
+            }
+
+            template <typename... Ts>
+            static auto GetDigestOf(Ts&&... pack) -> std::enable_if_t<!(std::is_integral_v<std::decay_t<Ts>> || ...), Digest>
+            {
+                GenericHash hash;
+                (hash.UpdateData(std::forward<Ts>(pack)), ...);
+                hash.Finalize();
+                return hash.GetDigest();
+            }
+
+            GenericHash() : _ctx(GenericHashImpl::MakeCTX())
+            {
+                int result = EVP_DigestInit_ex(_ctx, HashCreator(), nullptr);
+                ASSERT(result == 1);
+            }
+
+            ~GenericHash()
+            {
+                if (!_ctx)
+                    return;
+                GenericHashImpl::DestroyCTX(_ctx);
+                _ctx = nullptr;
+            }
+
+            void UpdateData(uint8 const* data, size_t len)
+            {
+                int result = EVP_DigestUpdate(_ctx, data, len);
+                ASSERT(result == 1);
+            }
+            void UpdateData(std::string_view str) { UpdateData(reinterpret_cast<uint8 const*>(str.data()), str.size()); }
+            void UpdateData(std::string const& str) { UpdateData(std::string_view(str)); } /* explicit overload to avoid using the container template */
+            void UpdateData(char const* str) { UpdateData(std::string_view(str)); } /* explicit overload to avoid using the container template */
+            template <typename Container>
+            void UpdateData(Container const& c) { UpdateData(std::data(c), std::size(c)); }
+
+            void Finalize()
+            {
+                uint32 length;
+                int result = EVP_DigestFinal_ex(_ctx, _digest.data(), &length);
+                ASSERT(result == 1);
+                ASSERT(length == DIGEST_LENGTH);
+                GenericHashImpl::DestroyCTX(_ctx);
+                _ctx = nullptr;
+            }
+
+            Digest const& GetDigest() const { return _digest; }
+
+        private:
+            EVP_MD_CTX* _ctx;
+            Digest _digest;
+    };
+}
+
+namespace Trinity::Crypto
+{
+    using SHA1 = Trinity::Impl::GenericHash<EVP_sha1, Constants::SHA1_DIGEST_LENGTH_BYTES>;
+    using SHA256 = Trinity::Impl::GenericHash<EVP_sha256, Constants::SHA256_DIGEST_LENGTH_BYTES>;
+}
+
+#endif