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) 18 19 #include <limits.h> 20 #include <stdlib.h> 21 22 #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 33 #pragma warning(pop) 34 35 #include "internal.h" 36 37 38 void RAND_cleanup(void) { 39 } 40 41 void CRYPTO_sysrand(uint8_t *out, size_t requested) { 42 while (requested > 0) { 43 ULONG output_bytes_this_pass = ULONG_MAX; 44 if (requested < output_bytes_this_pass) { 45 output_bytes_this_pass = requested; 46 } 47 if (RtlGenRandom(out, output_bytes_this_pass) == FALSE) { 48 abort(); 49 } 50 requested -= output_bytes_this_pass; 51 out += output_bytes_this_pass; 52 } 53 return; 54 } 55 56 #endif /* OPENSSL_WINDOWS */ 57
