module std.internal.windows.bcrypt; version (Windows): import core.sys.windows.bcrypt : BCryptGenRandom, BCRYPT_USE_SYSTEM_PREFERRED_RNG;import core.sys.windows.windef : HMODULE, PUCHAR, ULONG;import core.sys.windows.ntdef : NT_SUCCESS; pragma(lib, "Bcrypt.lib"); package(std) bool bcryptGenRandom(T)(out T result) @trusted{    loadBcrypt();     const gotRandom = ptrBCryptGenRandom(        null,        cast(PUCHAR) &result,        ULONG(T.sizeof),        BCRYPT_USE_SYSTEM_PREFERRED_RNG,    );     return NT_SUCCESS(gotRandom);} private{    HMODULE hBcrypt = null;    typeof(BCryptGenRandom)* ptrBCryptGenRandom;} private void loadBcrypt() @nogc nothrow{    import core.sys.windows.winbase : GetProcAddress, LoadLibraryA;     if (!hBcrypt)    {        hBcrypt = LoadLibraryA("Bcrypt.dll");        if (!hBcrypt)            assert(false, `LoadLibraryA("Bcrypt.dll") failed.`); // `@nogc`         ptrBCryptGenRandom = cast(typeof(ptrBCryptGenRandom)) GetProcAddress(hBcrypt , "BCryptGenRandom");        if (!ptrBCryptGenRandom)            assert(false, `GetProcAddress(hBcrypt , "BCryptGenRandom") failed.`); // `@nogc`    }} // Will free `Bcrypt.dll`.private void freeBcrypt() @nogc nothrow{    import core.sys.windows.winbase : FreeLibrary;     if (hBcrypt)    {        if (!FreeLibrary(hBcrypt))            assert(false, `FreeLibrary("Bcrypt.dll") failed.`); // `@nogc`         hBcrypt = null;        ptrBCryptGenRandom = null;    }} static ~this(){    freeBcrypt();}