diff options
Diffstat (limited to 'src/os_mswin.c')
| -rw-r--r-- | src/os_mswin.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/os_mswin.c b/src/os_mswin.c index 9d0e1a08a4..df760fd5ec 100644 --- a/src/os_mswin.c +++ b/src/os_mswin.c @@ -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, |