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#include <iostream>
#include <iomanip>
#include <cmath>
#include <string>
#include <exception>
#include <botan/libstate.h>
#include <botan/filters.h>
using Botan::byte;
using Botan::u64bit;
#include "common.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,
bool html, double seconds)
{
Botan::Pipe pipe(filter, new BitBucket);
pipe.start_msg();
static const u32bit BUFFERSIZE = 32*1024;
byte buf[BUFFERSIZE];
Botan::global_state().randomize(buf, BUFFERSIZE);
u32bit iterations = 0;
u64bit start = get_clock(), clocks_used = 0;
u64bit go_up_to = static_cast<u64bit>(seconds * get_ticks());
while(clocks_used < go_up_to)
{
iterations++;
pipe.write(buf, BUFFERSIZE);
clocks_used = get_clock() - start;
}
double bytes_per_sec = (static_cast<double>(iterations) * BUFFERSIZE) /
(static_cast<double>(clocks_used) / get_ticks());
double mbytes_per_sec = bytes_per_sec / (1024.0 * 1024.0);
std::cout.setf(std::ios::fixed, std::ios::floatfield);
std::cout.precision(2);
if(html)
{
if(name.find("<") != std::string::npos)
name.replace(name.find("<"), 1, "<");
if(name.find(">") != std::string::npos)
name.replace(name.find(">"), 1, ">");
std::cout << " <TR><TH>" << name
<< std::string(25 - name.length(), ' ') << " <TH>";
std::cout.width(6);
std::cout << mbytes_per_sec << std::endl;
}
else
{
std::cout << name << ": " << std::string(25 - name.length(), ' ');
std::cout.width(6);
std::cout << mbytes_per_sec << " Mbytes/sec" << std::endl;
}
return (mbytes_per_sec);
}
double bench(const std::string& name, const std::string& filtername, bool html,
double seconds, u32bit keylen, u32bit ivlen)
{
std::vector<std::string> params;
Botan::SecureVector<byte> key(keylen);
Botan::global_state().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, html, seconds);
return 0;
}
}
void benchmark(const std::string& what, bool html, double seconds)
{
try {
if(html)
{
std::cout << "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD "
<< "HTML 4.0 Transitional//EN\">\n"
<< "<HTML>\n\n"
<< "<TITLE>Botan Benchmarks</TITLE>\n\n"
<< "<BODY>\n\n"
<< "<P><TABLE BORDER CELLSPACING=1>\n"
<< "<THEAD>\n"
<< "<TR><TH>Algorithm "
<< "<TH>Mbytes / second\n"
<< "<TBODY>\n";
}
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,
html, seconds, algos[j].keylen,
algos[j].ivlen);
if(speed > .00001) /* log(0) == -inf -> messed up average */
sum += std::log(speed);
how_many++;
}
if(html)
std::cout << "</TABLE>\n\n";
double average = std::exp(sum / static_cast<double>(how_many));
if(what == "All" && html)
std::cout << "\n<P>Overall speed average: " << average
<< "\n\n";
else if(what == "All")
std::cout << "\nOverall speed average: " << average
<< std::endl;
if(html) std::cout << "</BODY></HTML>\n";
}
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, 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, false, seconds,
algos[j].keylen, algos[j].ivlen);
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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