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random_seed: Support using CryptGenRandom on windows

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Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2012-10-11 14:30:23 +03:00
parent 26b3fde6a7
commit 1093383d6c
2 changed files with 17 additions and 0 deletions
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2
configure vendored
View File

@ -1139,6 +1139,7 @@ HAVE_LIST="
closesocket
cmov
cpunop
CryptGenRandom
dcbzl
dev_bktr_ioctl_bt848_h
dev_bktr_ioctl_meteor_h
@ -3202,6 +3203,7 @@ check_func sysctl
check_func usleep
check_func_headers io.h setmode
check_lib2 "windows.h shellapi.h" CommandLineToArgvW -lshell32
check_lib2 "windows.h wincrypt.h" CryptGenRandom -ladvapi32
check_lib2 "windows.h psapi.h" GetProcessMemoryInfo -lpsapi
check_func_headers windows.h GetProcessAffinityMask
check_func_headers windows.h GetProcessTimes

15
libavutil/random_seed.c
View File

@ -23,6 +23,10 @@
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_CRYPTGENRANDOM
#include <windows.h>
#include <wincrypt.h>
#endif
#include <fcntl.h>
#include <math.h>
#include <time.h>
@ -82,6 +86,17 @@ uint32_t av_get_random_seed(void)
{
uint32_t seed;
#if HAVE_CRYPTGENRANDOM
HCRYPTPROV provider;
if (CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
BOOL ret = CryptGenRandom(provider, sizeof(seed), (PBYTE) &seed);
CryptReleaseContext(provider, 0);
if (ret)
return seed;
}
#endif
if (read_random(&seed, "/dev/urandom") == sizeof(seed))
return seed;
if (read_random(&seed, "/dev/random") == sizeof(seed))