1520149868
Batch #4599 by Snow: 0 byte-identical, 2 confirmed by peer review. - fn_08237 ThemidaKeyEncoderA::Generate: logic confirmed by peer review - fn_08238 ThemidaKeyEncoderB::Generate: logic confirmed by peer review Peer-reviewed-by: eAthena, youko Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).
86 lines
2.2 KiB
C++
86 lines
2.2 KiB
C++
#include "Security/ThemidaMgr.h"
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#include <new>
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#include <random>
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// GLOBAL: gl_24891
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CThemidaMgr* g_themidaMgr;
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void sub_6563E0(char* first, char* last, void* distribution);
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struct ThemidaKeyRandom {
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std::mt19937 engine;
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std::uniform_int_distribution<int> distribution;
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ThemidaKeyRandom(unsigned int seed) : engine(seed), distribution(1, 0xfe) {
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}
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};
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struct ThemidaKeyEncoderA {
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unsigned char* Generate(const unsigned char* input);
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};
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struct ThemidaKeyEncoderB {
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unsigned char* Generate(const unsigned char* input);
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};
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// OFFSET: 0x0076EC00
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// FUNCTION: fn_08235
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CThemidaMgr::CThemidaMgr() : m_valid(true) {
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}
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// OFFSET: 0x0076EC10
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// FUNCTION: fn_08236
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CThemidaMgr::~CThemidaMgr() {
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}
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// OFFSET: 0x0076EC20
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// FUNCTION: fn_08237
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unsigned char* ThemidaKeyEncoderA::Generate(const unsigned char* input) {
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auto* output = reinterpret_cast<unsigned char*>(this);
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ThemidaKeyRandom random(std::random_device{}());
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sub_6563E0(reinterpret_cast<char*>(output), reinterpret_cast<char*>(output) + 5, &random);
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output[5] = input[0] ^ output[1] ^ output[0];
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output[6] = input[1] ^ output[2] ^ output[1];
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output[7] = input[2] ^ output[3] ^ output[2];
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output[8] = output[4] ^ input[3] ^ output[3];
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return output;
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}
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// OFFSET: 0x0076ECC0
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// FUNCTION: fn_08238
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unsigned char* ThemidaKeyEncoderB::Generate(const unsigned char* input) {
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auto* output = reinterpret_cast<unsigned char*>(this);
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ThemidaKeyRandom random(std::random_device{}());
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sub_6563E0(reinterpret_cast<char*>(output), reinterpret_cast<char*>(output) + 5, &random);
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output[5] = input[0] ^ output[1] ^ output[0];
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output[6] = input[1] ^ output[2] ^ output[1];
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output[7] = input[2] ^ output[3] ^ output[2];
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output[8] = output[4] ^ input[3] ^ output[3];
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return output;
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}
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// OFFSET: 0x0076EDE0
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// FUNCTION: fn_08240
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bool CThemidaMgr::Create() {
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if (g_themidaMgr == nullptr) {
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g_themidaMgr = new (std::nothrow) CThemidaMgr();
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if (g_themidaMgr != nullptr) {
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if (g_themidaMgr->m_valid) {
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return true;
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}
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delete g_themidaMgr;
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g_themidaMgr = nullptr;
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}
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}
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return false;
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}
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// OFFSET: 0x0076EE90
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// FUNCTION: fn_08241
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void CThemidaMgr::Destroy() {
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if (g_themidaMgr != nullptr) {
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delete g_themidaMgr;
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g_themidaMgr = nullptr;
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}
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}
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