1 /* Copyright (c) 2014, Google Inc.
2 *
3 * Permission to use, copy, modify, and/or distribute this software for any
4 * purpose with or without fee is hereby granted, provided that the above
5 * copyright notice and this permission notice appear in all copies.
6 *
7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
14
15 #include <openssl/rand.h>
16
17 #if defined(OPENSSL_WINDOWS) && !defined(BORINGSSL_UNSAFE_DETERMINISTIC_MODE)
18
19 #include <limits.h>
20 #include <stdlib.h>
21
22 OPENSSL_MSVC_PRAGMA(warning(push, 3))
23
24 #include <windows.h>
25
26 /* #define needed to link in RtlGenRandom(), a.k.a. SystemFunction036. See the
27 * "Community Additions" comment on MSDN here:
28 * http://msdn.microsoft.com/en-us/library/windows/desktop/aa387694.aspx */
29 #define SystemFunction036 NTAPI SystemFunction036
30 #include <ntsecapi.h>
31 #undef SystemFunction036
32
OPENSSL_MSVC_PRAGMA(warning (pop))33 OPENSSL_MSVC_PRAGMA(warning(pop))
34
35 #include "../fipsmodule/rand/internal.h"
36
37
38 void CRYPTO_sysrand(uint8_t *out, size_t requested) {
39 while (requested > 0) {
40 ULONG output_bytes_this_pass = ULONG_MAX;
41 if (requested < output_bytes_this_pass) {
42 output_bytes_this_pass = (ULONG)requested;
43 }
44 if (RtlGenRandom(out, output_bytes_this_pass) == FALSE) {
45 abort();
46 }
47 requested -= output_bytes_this_pass;
48 out += output_bytes_this_pass;
49 }
50 return;
51 }
52
53 #endif /* OPENSSL_WINDOWS && !BORINGSSL_UNSAFE_DETERMINISTIC_MODE */
54