Initial commit: wowee native WoW 3.3.5a client

include/auth/rc4.hpp

@@ -0,0 +1,53 @@
+#pragma once
+
+#include <cstdint>
+#include <vector>
+
+namespace wowee {
+namespace auth {
+
+/**
+ * RC4 Stream Cipher
+ *
+ * Used for encrypting/decrypting World of Warcraft packet headers.
+ * Only the packet headers are encrypted; packet bodies remain plaintext.
+ *
+ * Implementation based on standard RC4 algorithm with 256-byte state.
+ */
+class RC4 {
+public:
+    RC4();
+    ~RC4() = default;
+
+    /**
+     * Initialize the RC4 cipher with a key
+     *
+     * @param key Key bytes for initialization
+     */
+    void init(const std::vector<uint8_t>& key);
+
+    /**
+     * Process bytes through the RC4 cipher
+     * Encrypts or decrypts data in-place (RC4 is symmetric)
+     *
+     * @param data Pointer to data to process
+     * @param length Number of bytes to process
+     */
+    void process(uint8_t* data, size_t length);
+
+    /**
+     * Drop the first N bytes of keystream
+     * WoW protocol requires dropping first 1024 bytes
+     *
+     * @param count Number of bytes to drop
+     */
+    void drop(size_t count);
+
+private:
+    uint8_t state[256];  // RC4 state array
+    uint8_t x;           // First index
+    uint8_t y;           // Second index
+};
+
+} // namespace auth
+} // namespace wowee