[PATCH] Win32 use BCryptGenRandom to ensure the CNG FIPS RNG is used

[Norman Hamer]

diff --git a/src/utils/os_win32.c b/src/utils/os_win32.c
index f9e4b308e..bb6868f27 100644
--- a/src/utils/os_win32.c
+++ b/src/utils/os_win32.c
@@ -131,17 +131,8 @@ void os_daemonize_terminate(const char *pid_file)
 
 int os_get_random(unsigned char *buf, size_t len)
 {
-	HCRYPTPROV prov;
-	BOOL ret;
-
-	if (!CryptAcquireContext(&prov, NULL, NULL, PROV_RSA_FULL,
-				 CRYPT_VERIFYCONTEXT))
-		return -1;
-
-	ret = CryptGenRandom(prov, len, buf);
-	CryptReleaseContext(prov, 0);
-
-	return ret ? 0 : -1;
+	NTSTATUS status = BCryptGenRandom(NULL, buf, len, BCRYPT_USE_SYSTEM_PREFERRED_RNG);
+	return status ? -1 : 0;
 }