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/*
* Runtime benchmarking
* (C) 2008-2009,2013 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/benchmark.h>
#include <botan/buf_comp.h>
#include <botan/block_cipher.h>
#include <botan/stream_cipher.h>
#include <botan/aead.h>
#include <botan/hash.h>
#include <botan/mac.h>
#include <vector>
#include <chrono>
namespace Botan {
double time_op(std::chrono::nanoseconds runtime, std::function<void ()> op)
{
std::chrono::nanoseconds time_used(0);
size_t reps = 0;
auto start = std::chrono::high_resolution_clock::now();
while(time_used < runtime)
{
op();
++reps;
time_used = std::chrono::high_resolution_clock::now() - start;
}
const u64bit nsec_used = std::chrono::duration_cast<std::chrono::nanoseconds>(time_used).count();
const double seconds_used = static_cast<double>(nsec_used) / 1000000000;
return reps / seconds_used; // ie, return ops per second
}
std::map<std::string, double>
time_algorithm_ops(const std::string& name,
Algorithm_Factory& af,
const std::string& provider,
RandomNumberGenerator& rng,
std::chrono::nanoseconds runtime,
size_t buf_size)
{
const size_t Mebibyte = 1024*1024;
secure_vector<byte> buffer(buf_size * 1024);
rng.randomize(&buffer[0], buffer.size());
const double mb_mult = buffer.size() / static_cast<double>(Mebibyte);
if(const BlockCipher* proto = af.prototype_block_cipher(name, provider))
{
std::unique_ptr<BlockCipher> bc(proto->clone());
const SymmetricKey key(rng, bc->maximum_keylength());
return std::map<std::string, double>({
{ "key schedule", time_op(runtime / 8, [&]() { bc->set_key(key); }) },
{ "encrypt", mb_mult * time_op(runtime / 2, [&]() { bc->encrypt(buffer); }) },
{ "decrypt", mb_mult * time_op(runtime / 2, [&]() { bc->decrypt(buffer); }) },
});
}
else if(const StreamCipher* proto = af.prototype_stream_cipher(name, provider))
{
std::unique_ptr<StreamCipher> sc(proto->clone());
const SymmetricKey key(rng, sc->maximum_keylength());
return std::map<std::string, double>({
{ "key schedule", time_op(runtime / 8, [&]() { sc->set_key(key); }) },
{ "", mb_mult * time_op(runtime, [&]() { sc->encipher(buffer); }) },
});
}
else if(const HashFunction* proto = af.prototype_hash_function(name, provider))
{
std::unique_ptr<HashFunction> h(proto->clone());
return std::map<std::string, double>({
{ "", mb_mult * time_op(runtime, [&]() { h->update(buffer); }) },
});
}
else if(const MessageAuthenticationCode* proto = af.prototype_mac(name, provider))
{
std::unique_ptr<MessageAuthenticationCode> mac(proto->clone());
const SymmetricKey key(rng, mac->maximum_keylength());
return std::map<std::string, double>({
{ "key schedule", time_op(runtime / 8, [&]() { mac->set_key(key); }) },
{ "", mb_mult * time_op(runtime, [&]() { mac->update(buffer); }) },
});
}
else
{
std::unique_ptr<AEAD_Mode> enc(get_aead(name, ENCRYPTION));
std::unique_ptr<AEAD_Mode> dec(get_aead(name, DECRYPTION));
if(enc && dec)
{
const SymmetricKey key(rng, enc->key_spec().maximum_keylength());
return std::map<std::string, double>({
{ "key schedule", time_op(runtime / 4, [&]() { enc->set_key(key); dec->set_key(key); }) / 2 },
{ "encrypt", mb_mult * time_op(runtime / 2, [&]() { enc->update(buffer, 0); buffer.resize(buf_size*1024); }) },
{ "decrypt", mb_mult * time_op(runtime / 2, [&]() { dec->update(buffer, 0); buffer.resize(buf_size*1024); }) },
});
}
}
return std::map<std::string, double>();
}
namespace {
double find_first_in(const std::map<std::string, double>& m,
const std::vector<std::string>& keys)
{
for(auto key : keys)
{
auto i = m.find(key);
if(i != m.end())
return i->second;
}
throw std::runtime_error("algorithm_factory no usable keys found in result");
}
}
std::map<std::string, double>
algorithm_benchmark(const std::string& name,
Algorithm_Factory& af,
RandomNumberGenerator& rng,
std::chrono::milliseconds milliseconds,
size_t buf_size)
{
const std::vector<std::string> providers = af.providers_of(name);
std::map<std::string, double> all_results; // provider -> ops/sec
if(!providers.empty())
{
const std::chrono::nanoseconds ns_per_provider = milliseconds / providers.size();
for(auto provider : providers)
{
auto results = time_algorithm_ops(name, af, provider, rng, ns_per_provider, buf_size);
all_results[provider] = find_first_in(results, { "", "update", "encrypt" });
}
}
return all_results;
}
}
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