feat(Core/Authserver): TOTP rewrite (#5620)

src/common/Cryptography/AES.cpp

@@ -0,0 +1,53 @@
+/*
+ * 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) 2021+  WarheadCore <https://github.com/WarheadCore>
+ */
+
+#include "AES.h"
+#include "Errors.h"
+#include <limits>
+
+acore::Crypto::AES::AES(bool encrypting) : _ctx(EVP_CIPHER_CTX_new()), _encrypting(encrypting)
+{
+    EVP_CIPHER_CTX_init(_ctx);
+    int status = EVP_CipherInit_ex(_ctx, EVP_aes_128_gcm(), nullptr, nullptr, nullptr, _encrypting ? 1 : 0);
+    ASSERT(status);
+}
+
+acore::Crypto::AES::~AES()
+{
+    EVP_CIPHER_CTX_free(_ctx);
+}
+
+void acore::Crypto::AES::Init(Key const& key)
+{
+    int status = EVP_CipherInit_ex(_ctx, nullptr, nullptr, key.data(), nullptr, -1);
+    ASSERT(status);
+}
+
+bool acore::Crypto::AES::Process(IV const& iv, uint8* data, size_t length, Tag& tag)
+{
+    ASSERT(length <= static_cast<size_t>(std::numeric_limits<int>::max()));
+    int len = static_cast<int>(length);
+    if (!EVP_CipherInit_ex(_ctx, nullptr, nullptr, nullptr, iv.data(), -1))
+        return false;
+
+    int outLen;
+    if (!EVP_CipherUpdate(_ctx, data, &outLen, data, len))
+        return false;
+
+    len -= outLen;
+
+    if (!_encrypting && !EVP_CIPHER_CTX_ctrl(_ctx, EVP_CTRL_GCM_SET_TAG, sizeof(tag), tag))
+        return false;
+
+    if (!EVP_CipherFinal_ex(_ctx, data + outLen, &outLen))
+        return false;
+
+    ASSERT(len == outLen);
+
+    if (_encrypting && !EVP_CIPHER_CTX_ctrl(_ctx, EVP_CTRL_GCM_GET_TAG, sizeof(tag), tag))
+        return false;
+
+    return true;
+}