C++ API Hashing

    //Credits: karcrack
    #ifndef CRYPTAPI
    #define CRYPTAPI
    struct FNV1a{
    template <size_t N>
    __forceinline static DWORD hash(const char (&str)[N]){
    return (hash<N-1>((const char(&)[N-1])str)^str[N-1]) * 16777619u;
    };
    template <>
    __forceinline static DWORD hash<1>(const char (&str)[1]){
    return (2166136261u^str[0]) * 16777619u;
    };
    __forceinline static DWORD hash(char* str){
    DWORD r = 2166136261u;
    do{
    r ^= *str;
    r *= 16777619u;
    }while(*str++);
    return r;
    };
    };
    struct CUSTOM{
    template <size_t N>
    __forceinline static DWORD hash(const char (&str)[N]){
    return ((hash<N-1>((const char(&)[N-1])str) ^ (str[N-1] << 24)) >> 2);
    };
    template <>
    __forceinline static DWORD hash<1>(const char (&str)[1]){
    return (str[0]<<24)>>2;
    };
    __forceinline static DWORD hash(char* str){
    DWORD r = 0;
    do{
    r ^= (*str << 24);
    r >>= 2;
    }while(*str++);
    return r;
    };
    };
    template <class ret, class hashFnc = FNV1a> class invoke{
    private:
    char* base;
    DWORD FuncHash;
    public:
    template <size_t N, size_t M>
    invoke(const char (&DLL)[N], const char (&Func)[M]){
    base = (char*)LoadLibraryA(DLL);
    FuncHash = hashFnc::hash<M>(Func);
    };
    ret operator()(int numArgs, ...){
    BYTE* dirApi;
    IMAGE_DOS_HEADER* IDH = (IMAGE_DOS_HEADER*)base;
    IMAGE_NT_HEADERS* INH = (IMAGE_NT_HEADERS*)(base + IDH->e_lfanew);
    IMAGE_OPTIONAL_HEADER* IOH = &INH->OptionalHeader;
    IMAGE_DATA_DIRECTORY* IDE = (IMAGE_DATA_DIRECTORY*)(&IOH->DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT]);
    IMAGE_EXPORT_DIRECTORY* IED = (IMAGE_EXPORT_DIRECTORY *)(base + IDE->VirtualAddress);
    void** FTABLE = (void **)(base + IED->AddressOfFunctions);
    WORD* OTABLE = (WORD *)(base + IED->AddressOfNameOrdinals);
    char** NTABLE = (char **)(base + IED->AddressOfNames);
    for (DWORD i = 0; i <= IED->NumberOfNames; i++){
    if (hashFnc::hash(base + (DWORD)NTABLE[i]) == FuncHash){
    dirApi = (BYTE*)(base + (DWORD)FTABLE[OTABLE[i]]);
    break;
    }
    }
    va_list listaArgs;
    void** args;
    va_start(listaArgs, numArgs);
    args = &va_arg(listaArgs, void*);
    for(int n=numArgs-1; n>=0; n--){
    void* temp = args[n];
    __asm
    push [temp]
    }
    va_end(listaArgs);
    __asm
    call dirApi
    };
    };
    #endif