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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();
}
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