Core/PacketIO: Updated packet encryption to 8.2

1 files changed, 55 insertions, 0 deletions

diff --git a/src/common/Cryptography/AES.cpp b/src/common/Cryptography/AES.cpp
new file mode 100644
index 00000000000..cd9ff29f79f
--- /dev/null
+++ b/src/common/Cryptography/AES.cpp
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2008-2019 TrinityCore <https://www.trinitycore.org/>
+ *
+ * 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/>.
+ */
+
+#include "AES.h"
+
+Trinity::Crypto::AES::AES(bool encrypting) : _ctx(EVP_CIPHER_CTX_new())
+{
+    EVP_CIPHER_CTX_init(_ctx);
+    EVP_CipherInit_ex(_ctx, EVP_aes_128_gcm(), nullptr, nullptr, nullptr, encrypting ? 1 : 0);
+}
+
+Trinity::Crypto::AES::~AES()
+{
+    EVP_CIPHER_CTX_free(_ctx);
+}
+
+void Trinity::Crypto::AES::Init(uint8 const* key)
+{
+    EVP_CipherInit_ex(_ctx, nullptr, nullptr, key, nullptr, -1);
+}
+
+bool Trinity::Crypto::AES::Process(uint8 const* iv, uint8* data, std::size_t length, uint8* tag)
+{
+    if (!EVP_CipherInit_ex(_ctx, nullptr, nullptr, nullptr, iv, -1))
+        return false;
+
+    int outLen;
+    if (!EVP_CipherUpdate(_ctx, data, &outLen, data, length))
+        return false;
+
+    if (!EVP_CIPHER_CTX_encrypting(_ctx) && !EVP_CIPHER_CTX_ctrl(_ctx, EVP_CTRL_GCM_SET_TAG, 12, tag))
+        return false;
+
+    if (!EVP_CipherFinal_ex(_ctx, data + outLen, &outLen))
+        return false;
+
+    if (EVP_CIPHER_CTX_encrypting(_ctx) && !EVP_CIPHER_CTX_ctrl(_ctx, EVP_CTRL_GCM_GET_TAG, 12, tag))
+        return false;
+
+    return true;
+}