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/*************************************************
* Unix EntropySource Source File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#include <botan/es_unix.h>
#include <botan/unix_cmd.h>
#include <botan/parsing.h>
#include <botan/conf.h>
#include <algorithm>
namespace Botan {
namespace {
/*************************************************
* Sort ordering by priority *
*************************************************/
bool Unix_Program_Cmp(const Unix_Program& a, const Unix_Program& b)
{ return (a.priority < b.priority); }
}
/*************************************************
* Unix_EntropySource Constructor *
*************************************************/
Unix_EntropySource::Unix_EntropySource()
{
add_default_sources(sources);
}
/*************************************************
* Add sources to the list *
*************************************************/
void Unix_EntropySource::add_sources(const Unix_Program srcs[], u32bit count)
{
sources.insert(sources.end(), srcs, srcs + count);
std::sort(sources.begin(), sources.end(), Unix_Program_Cmp);
}
/*************************************************
* Unix Fast Poll *
*************************************************/
void Unix_EntropySource::do_fast_poll()
{
gather(2*1024);
}
/*************************************************
* Unix Slow Poll *
*************************************************/
void Unix_EntropySource::do_slow_poll()
{
gather(16*1024);
}
/*************************************************
* Gather Entropy From Several Unix_Programs *
*************************************************/
void Unix_EntropySource::gather(u32bit target_amount)
{
const u32bit MINIMAL_WORKING = 32;
u32bit got = 0;
for(u32bit j = 0; j != sources.size(); j++)
{
add_timestamp();
got += gather_from(sources[j]);
sources[j].working = (got >= MINIMAL_WORKING) ? true : false;
if(got >= target_amount)
break;
}
}
/*************************************************
* Gather entropy from a Unix program *
*************************************************/
u32bit Unix_EntropySource::gather_from(const Unix_Program& prog)
{
const std::string BASE_PATH = "/bin:/sbin:/usr/bin:/usr/sbin";
const std::string EXTRA_PATH = Config::get_string("rng/unix_path");
std::string PATH = BASE_PATH;
if(EXTRA_PATH != "")
PATH += ':' + EXTRA_PATH;
DataSource_Command pipe(prog.name_and_args, PATH);
if(pipe.end_of_data())
return 0;
u32bit got = 0;
SecureVector<byte> buffer(DEFAULT_BUFFERSIZE);
while(!pipe.end_of_data())
{
u32bit this_loop = pipe.read(buffer, buffer.size());
add_bytes(buffer, this_loop);
got += this_loop;
}
return got;
}
}
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