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If libgcrypt is available but /dev/urandom is not, use libgcrypt for RNG

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This commit is contained in:
Ilari Liusvaara 2013-10-16 12:50:40 +03:00
parent d3eee55445
commit 84f0d2f774
1 changed files with 14 additions and 0 deletions
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14
src/core/misc.cpp
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@ -23,6 +23,10 @@
#include <cstring>
#include <boost/filesystem.hpp>
#ifdef USE_LIBGCRYPT_SHA256
#include <gcrypt.h>
#endif
namespace
{
std::string rseed;
@ -119,6 +123,16 @@ void set_random_seed() throw(std::bad_alloc)
return;
}
}
//If libgcrypt is available, use that.
#ifdef USE_LIBGCRYPT_SHA256
{
char buf[64];
gcry_randomize((unsigned char*)buf, sizeof(buf), GCRY_STRONG_RANDOM);
std::string s(buf, sizeof(buf));
set_random_seed(s);
return;
}
#endif
//Fall back to time.
std::ostringstream str;
str << collect_identifying_information() << " " << time(NULL);