A tool for deriving PKG packet encryption keys for ps4 written in c++
| 1 | /* |
| 2 | * PS4 Safe Memory Access Layer |
| 3 | * Protects against invalid memory accesses in decompiled code |
| 4 | */ |
| 5 | |
| 6 | #ifndef PS4_SAFE_MEMORY_H |
| 7 | #define PS4_SAFE_MEMORY_H |
| 8 | |
| 9 | #include <cstdint> |
| 10 | #include <cstring> |
| 11 | |
| 12 | // Safe memory read - returns 0 for invalid addresses |
| 13 | template<typename T> |
| 14 | inline T safe_read(uintptr_t addr) { |
| 15 | extern uint8_t g_ps4_memory[]; |
| 16 | extern const size_t G_PS4_MEMORY_SIZE; |
| 17 | |
| 18 | // Check if address is within g_ps4_memory bounds |
| 19 | if (addr < G_PS4_MEMORY_SIZE) { |
| 20 | return *reinterpret_cast<T*>(&g_ps4_memory[addr]); |
| 21 | } |
| 22 | |
| 23 | // Check if it's a pointer into g_ps4_memory |
| 24 | uintptr_t memBase = reinterpret_cast<uintptr_t>(g_ps4_memory); |
| 25 | if (addr >= memBase && addr < memBase + G_PS4_MEMORY_SIZE) { |
| 26 | return *reinterpret_cast<T*>(addr); |
| 27 | } |
| 28 | |
| 29 | // Invalid address - return 0 |
| 30 | return T(0); |
| 31 | } |
| 32 | |
| 33 | // Safe memory write - ignores writes to invalid addresses |
| 34 | template<typename T> |
| 35 | inline void safe_write(uintptr_t addr, T value) { |
| 36 | extern uint8_t g_ps4_memory[]; |
| 37 | extern const size_t G_PS4_MEMORY_SIZE; |
| 38 | |
| 39 | if (addr < G_PS4_MEMORY_SIZE) { |
| 40 | *reinterpret_cast<T*>(&g_ps4_memory[addr]) = value; |
| 41 | return; |
| 42 | } |
| 43 | |
| 44 | uintptr_t memBase = reinterpret_cast<uintptr_t>(g_ps4_memory); |
| 45 | if (addr >= memBase && addr < memBase + G_PS4_MEMORY_SIZE) { |
| 46 | *reinterpret_cast<T*>(addr) = value; |
| 47 | } |
| 48 | // Otherwise silently ignore |
| 49 | } |
| 50 | |
| 51 | // Safe pointer dereference |
| 52 | template<typename T> |
| 53 | inline T safe_deref(T* ptr) { |
| 54 | if (ptr == nullptr) return T(0); |
| 55 | |
| 56 | extern uint8_t g_ps4_memory[]; |
| 57 | extern const size_t G_PS4_MEMORY_SIZE; |
| 58 | |
| 59 | uintptr_t addr = reinterpret_cast<uintptr_t>(ptr); |
| 60 | uintptr_t memBase = reinterpret_cast<uintptr_t>(g_ps4_memory); |
| 61 | |
| 62 | // Check if pointer is within valid memory |
| 63 | if (addr >= memBase && addr + sizeof(T) <= memBase + G_PS4_MEMORY_SIZE) { |
| 64 | return *ptr; |
| 65 | } |
| 66 | |
| 67 | // Check if it's a small offset (likely g_ps4_memory index) |
| 68 | if (addr < G_PS4_MEMORY_SIZE) { |
| 69 | return *reinterpret_cast<T*>(&g_ps4_memory[addr]); |
| 70 | } |
| 71 | |
| 72 | return T(0); |
| 73 | } |
| 74 | |
| 75 | // Safe pointer dereference for decompiled code - used by safe_deref_ptr<T>(ptr) |
| 76 | template<typename T> |
| 77 | inline T safe_deref_ptr(T* ptr) { |
| 78 | if (ptr == nullptr) return T(0); |
| 79 | |
| 80 | extern uint8_t g_ps4_memory[]; |
| 81 | |
| 82 | uintptr_t addr = reinterpret_cast<uintptr_t>(ptr); |
| 83 | uintptr_t memBase = reinterpret_cast<uintptr_t>(g_ps4_memory); |
| 84 | constexpr size_t memSize = 0x1000000; // 16MB |
| 85 | |
| 86 | // Check if pointer is within g_ps4_memory bounds |
| 87 | if (addr >= memBase && addr + sizeof(T) <= memBase + memSize) { |
| 88 | return *ptr; |
| 89 | } |
| 90 | |
| 91 | // Check if it's a small offset (index into g_ps4_memory) |
| 92 | if (addr < memSize) { |
| 93 | return *reinterpret_cast<T*>(&g_ps4_memory[addr]); |
| 94 | } |
| 95 | |
| 96 | // Invalid pointer - return 0 to avoid crash |
| 97 | return T(0); |
| 98 | } |
| 99 | |
| 100 | #endif // PS4_SAFE_MEMORY_H |
| 101 |