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/*************************************************
* File EntropySource Source File *
* (C) 1999-2005 The Botan Project *
*************************************************/
#include <botan/es_file.h>
#include <botan/conf.h>
#include <botan/parsing.h>
#include <fstream>
namespace Botan {
/*************************************************
* File_EntropySource Constructor *
*************************************************/
File_EntropySource::File_EntropySource(const std::string& sources)
{
std::vector<std::string> source_list = split_on(sources, ':');
std::vector<std::string> defaults = Config::get_list("rng/es_files");
for(u32bit j = 0; j != source_list.size(); j++)
add_source(source_list[j]);
for(u32bit j = 0; j != defaults.size(); j++)
add_source(defaults[j]);
}
/*************************************************
* Add another file to the list *
*************************************************/
void File_EntropySource::add_source(const std::string& source)
{
sources.push_back(source);
}
/*************************************************
* Gather Entropy from Randomness Source *
*************************************************/
u32bit File_EntropySource::slow_poll(byte output[], u32bit length)
{
u32bit read = 0;
for(u32bit j = 0; j != sources.size(); j++)
{
std::ifstream random_source(sources[j].c_str(), std::ios::binary);
if(!random_source) continue;
random_source.read((char*)output + read, length);
read += random_source.gcount();
length -= random_source.gcount();
if(length == 0)
break;
}
return read;
}
}
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