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