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#include <iostream>
#include <iomanip>
#include <cmath>
#include <string>
#include <exception>
#include <botan/filters.h>
using Botan::byte;
using Botan::u64bit;
#include "common.h"
#include "timer.h"
#include "bench.h"
/* Discard output to reduce overhead */
struct BitBucket : public Botan::Filter
{
void write(const byte[], u32bit) {}
};
Botan::Filter* lookup(const std::string&,
const std::vector<std::string>&,
const std::string& = "All");
namespace {
double bench_filter(std::string name, Botan::Filter* filter,
Botan::RandomNumberGenerator& rng,
double seconds)
{
Botan::Pipe pipe(filter, new BitBucket);
std::vector<byte> buf(128 * 1024);
rng.randomize(&buf[0], buf.size());
pipe.start_msg();
Timer timer(name, buf.size());
while(timer.seconds() < seconds)
{
timer.start();
pipe.write(&buf[0], buf.size());
timer.stop();
}
pipe.end_msg();
double bytes_per_sec = timer.events() / timer.seconds();
double mbytes_per_sec = bytes_per_sec / (1024.0 * 1024.0);
std::cout.setf(std::ios::fixed, std::ios::floatfield);
std::cout.precision(2);
std::cout << name << " " << std::string(25 - name.length(), ' ');
std::cout.width(6);
std::cout << mbytes_per_sec << " MiB/sec" << std::endl;
return (mbytes_per_sec);
}
double bench(const std::string& name, const std::string& filtername,
double seconds, u32bit keylen, u32bit ivlen,
Botan::RandomNumberGenerator& rng)
{
std::vector<std::string> params;
Botan::SecureVector<byte> key(keylen);
rng.randomize(key, key.size());
params.push_back(hex_encode(key, key.size()));
//params.push_back(std::string(int(2*keylen), 'A'));
params.push_back(std::string(int(2* ivlen), 'A'));
Botan::Filter* filter = lookup(filtername, params);
if(filter)
return bench_filter(name, filter, rng, seconds);
return 0;
}
}
void benchmark(const std::string& what,
Botan::RandomNumberGenerator& rng,
double seconds)
{
try {
double sum = 0;
u32bit how_many = 0;
std::vector<algorithm> algos = get_algos();
for(u32bit j = 0; j != algos.size(); j++)
if(what == "All" || what == algos[j].type)
{
double speed = bench(algos[j].name, algos[j].filtername,
seconds, algos[j].keylen,
algos[j].ivlen, rng);
if(speed > .00001) /* log(0) == -inf -> messed up average */
sum += std::log(speed);
how_many++;
}
double average = std::exp(sum / static_cast<double>(how_many));
if(what == "All")
std::cout << "\nOverall speed average: " << average
<< std::endl;
}
catch(Botan::Exception& e)
{
std::cout << "Botan exception caught: " << e.what() << std::endl;
return;
}
catch(std::exception& e)
{
std::cout << "Standard library exception caught: " << e.what()
<< std::endl;
return;
}
catch(...)
{
std::cout << "Unknown exception caught." << std::endl;
return;
}
}
u32bit bench_algo(const std::string& name,
Botan::RandomNumberGenerator& rng,
double seconds)
{
try {
std::vector<algorithm> algos = get_algos();
for(u32bit j = 0; j != algos.size(); j++)
{
if(algos[j].name == name)
{
bench(algos[j].name, algos[j].filtername, seconds,
algos[j].keylen, algos[j].ivlen, rng);
return 1;
}
}
return 0;
}
catch(Botan::Exception& e)
{
std::cout << "Botan exception caught: " << e.what() << std::endl;
return 0;
}
catch(std::exception& e)
{
std::cout << "Standard library exception caught: " << e.what()
<< std::endl;
return 0;
}
catch(...)
{
std::cout << "Unknown exception caught." << std::endl;
return 0;
}
}
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