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/*
* Parallel Hash
* (C) 1999-2009 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/internal/hash_utils.h>
#include <botan/par_hash.h>
#include <botan/parsing.h>
#include <botan/algo_registry.h>
namespace Botan {
BOTAN_REGISTER_NAMED_T(HashFunction, "Parallel", Parallel, Parallel::make);
Parallel* Parallel::make(const Spec& spec)
{
auto& hash_fns = Algo_Registry<HashFunction>::global_registry();
std::vector<std::unique_ptr<HashFunction>> hashes;
for(size_t i = 0; i != spec.arg_count(); ++i)
{
std::unique_ptr<HashFunction> h(hash_fns.make(spec.arg(i)));
if(!h)
return nullptr;
hashes.push_back(std::move(h));
}
Parallel* p = new Parallel;
std::swap(p->hashes, hashes);
return p;
}
void Parallel::add_data(const byte input[], size_t length)
{
for(auto&& hash : hashes)
hash->update(input, length);
}
void Parallel::final_result(byte out[])
{
u32bit offset = 0;
for(auto&& hash : hashes)
{
hash->final(out + offset);
offset += hash->output_length();
}
}
size_t Parallel::output_length() const
{
size_t sum = 0;
for(auto&& hash : hashes)
sum += hash->output_length();
return sum;
}
std::string Parallel::name() const
{
std::vector<std::string> names;
for(auto&& hash : hashes)
names.push_back(hash->name());
return "Parallel(" + string_join(names, ',') + ")";
}
HashFunction* Parallel::clone() const
{
std::vector<HashFunction*> hash_copies;
for(auto&& hash : hashes)
hash_copies.push_back(hash->clone());
return new Parallel(hash_copies);
}
void Parallel::clear()
{
for(auto&& hash : hashes)
hash->clear();
}
Parallel::Parallel(const std::vector<HashFunction*>& in)
{
for(size_t i = 0; i != in.size(); ++i)
{
std::unique_ptr<HashFunction> h(in[i]->clone());
hashes.push_back(std::move(h));
}
}
}
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