1 /* Copyright (c) 2014, Google Inc.
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.
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. */
15 #include <openssl/rand.h>
17 #if defined(OPENSSL_WINDOWS)
23 /* #define needed to link in RtlGenRandom(), a.k.a. SystemFunction036. See the
24 * "Community Additions" comment on MSDN here:
25 * http://msdn.microsoft.com/en-us/library/windows/desktop/aa387694.aspx */
26 #define SystemFunction036 NTAPI SystemFunction036
28 #undef SystemFunction036
31 void RAND_cleanup(void) {
34 int RAND_bytes(uint8_t *out, size_t requested) {
35 while (requested > 0) {
36 ULONG output_bytes_this_pass = ULONG_MAX;
37 if (requested < output_bytes_this_pass) {
38 output_bytes_this_pass = requested;
40 if (RtlGenRandom(out, output_bytes_this_pass) == FALSE) {
44 requested -= output_bytes_this_pass;
45 out += output_bytes_this_pass;
50 #endif /* OPENSSL_WINDOWS */