Now, I find a function get_generic_seed() So, I use this function will work fine?
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 HAVE_WINRTAPI return get_generic_seed();#endif if (read_random(&seed, "/dev/urandom") == sizeof(seed)) return seed; if (read_random(&seed, "/dev/random") == sizeof(seed)) return seed; return get_generic_seed();} > From: jessejiang0...@outlook.com > To: ffmpeg-devel@ffmpeg.org > Date: Fri, 21 Nov 2014 03:51:12 +0000 > Subject: Re: [FFmpeg-devel] WinRT API support patch > > Hi All, > I did some research, rand() is pseudo random. CryptGenRandom is the > system-wide seed, but it cannot be used in Windows RT. > I try to use CryptographicBuffer, which is Windows RT API, but there is a > problem. This API needs to link Windows.winmd. The Windows.winmd just like a > DLL, but it may different from Windows RT and Windows Phone. First, the SDKs > are in the different PATH,Second, the files are also different. > It means that developer need to choice platform first, and then compiler for > different library. > I hope ffmpeg only depends on support win32 apis and CRT apis. > So is there any way to instead of srand(time(0)); rand(); ? How about c++11 > <random> or Mersenne twister Algorithmic > Best regards,Jesse > Date: Fri, 21 Nov 2014 02:49:59 +0100 > From: michae...@gmx.at > To: ffmpeg-devel@ffmpeg.org > Subject: Re: [FFmpeg-devel] WinRT API support patch > > On Fri, Nov 21, 2014 at 01:43:29AM +0000, Jesse Jiang wrote: > > Do you mean that we can use rand() instead of CryptGenRandom in ffmpeg? > > rand() is completely wrong > its not even doing the correct operation > > rand() is pseudo random > the code requires a strong (and non pseudo) random value > > [...] > -- > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB > > When you are offended at any man's fault, turn to yourself and study your > own failings. Then you will forget your anger. -- Epictetus > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel