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https://github.com/Kelsidavis/WoWee.git
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59 lines
1.4 KiB
C++
59 lines
1.4 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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* Vanilla/TBC WoW Header Cipher
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*
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* Used for encrypting/decrypting World of Warcraft packet headers with the
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* legacy XOR+addition chaining cipher. Vanilla/classic uses the raw 40-byte
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* SRP session key; CMaNGOS TBC uses the same cipher with a 20-byte
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* HMAC-derived key.
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*
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* Algorithm (encrypt):
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* encrypted = (plaintext ^ key[index]) + previousEncrypted
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* index = (index + 1) % keyLen
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*
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* Algorithm (decrypt):
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* plaintext = (encrypted - previousEncrypted) ^ key[index]
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* index = (index + 1) % keyLen
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*/
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class VanillaCrypt {
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public:
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VanillaCrypt() = default;
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~VanillaCrypt() = default;
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/**
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* Initialize the cipher with the packet-header key.
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*/
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void init(const std::vector<uint8_t>& key);
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/**
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* Encrypt outgoing header bytes (CMSG: 6 bytes)
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* @param data Pointer to header data to encrypt in-place
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* @param length Number of bytes to encrypt
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*/
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void encrypt(uint8_t* data, size_t length);
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/**
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* Decrypt incoming header bytes (SMSG: 4 bytes)
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* @param data Pointer to header data to decrypt in-place
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* @param length Number of bytes to decrypt
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*/
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void decrypt(uint8_t* data, size_t length);
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private:
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std::vector<uint8_t> key_;
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uint8_t sendIndex_ = 0;
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uint8_t sendPrev_ = 0;
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uint8_t recvIndex_ = 0;
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uint8_t recvPrev_ = 0;
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};
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} // namespace auth
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} // namespace wowee
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