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patch 9.1.0518: initialize the random buffer can be improved

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Problem:  initialize the random buffer can be improved
Solution: refactor init_srand() function, move machine-specific parts to
          os_mswin and os_unix, implement a fallback for Windows 10 and
          later (LemonBoy)

closes: #15125

Signed-off-by: LemonBoy <thatlemon@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
LemonBoy
2024-07-04 13:20:49 +02:00
committed by Christian Brabandt
parent 898b3740c7
commit 9987fe8ca0
6 changed files with 91 additions and 47 deletions
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34
src/os_mswin.c
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@@ -830,6 +830,40 @@ mch_icon_load(HANDLE *iconp)
0, mch_icon_load_cb, iconp);
}
/*
* Fill the buffer 'buf' with 'len' random bytes.
* Returns FAIL if the OS PRNG is not available or something went wrong.
*/
int
mch_get_random(char_u *buf, int len)
{
static int initialized = NOTDONE;
static HINSTANCE hInstLib;
static BOOL (WINAPI *pProcessPrng)(PUCHAR, ULONG);
if (initialized == NOTDONE)
{
hInstLib = vimLoadLib("bcryptprimitives.dll");
if (hInstLib != NULL)
pProcessPrng = (void *)GetProcAddress(hInstLib, "ProcessPrng");
if (hInstLib == NULL || pProcessPrng == NULL)
{
FreeLibrary(hInstLib);
initialized = FAIL;
}
else
initialized = OK;
}
if (initialized == FAIL)
return FAIL;
// According to the documentation this call cannot fail.
pProcessPrng(buf, len);
return OK;
}
int
mch_libcall(
char_u *libname,