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/*************************************************
* Parallel Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#include <botan/par_hash.h>
#include <botan/lookup.h>
namespace Botan {
namespace {
/*************************************************
* Return the sum of the hash sizes *
*************************************************/
u32bit sum_of_hash_lengths(const std::vector<std::string>& names)
{
u32bit sum = 0;
for(u32bit j = 0; j != names.size(); ++j)
sum += output_length_of(names[j]);
return sum;
}
}
/*************************************************
* Update the hash *
*************************************************/
void Parallel::add_data(const byte input[], u32bit length)
{
for(u32bit j = 0; j != hashes.size(); ++j)
hashes[j]->update(input, length);
}
/*************************************************
* Finalize the hash *
*************************************************/
void Parallel::final_result(byte hash[])
{
u32bit offset = 0;
for(u32bit j = 0; j != hashes.size(); ++j)
{
hashes[j]->final(hash + offset);
offset += hashes[j]->OUTPUT_LENGTH;
}
}
/*************************************************
* Return the name of this type *
*************************************************/
std::string Parallel::name() const
{
std::string hash_names;
for(u32bit j = 0; j != hashes.size(); ++j)
{
if(j)
hash_names += ',';
hash_names += hashes[j]->name();
}
return "Parallel(" + hash_names + ")";
}
/*************************************************
* Return a clone of this object *
*************************************************/
HashFunction* Parallel::clone() const
{
std::vector<std::string> names;
for(u32bit j = 0; j != hashes.size(); ++j)
names.push_back(hashes[j]->name());
return new Parallel(names);
}
/*************************************************
* Clear memory of sensitive data *
*************************************************/
void Parallel::clear() throw()
{
for(u32bit j = 0; j != hashes.size(); ++j)
hashes[j]->clear();
}
/*************************************************
* Parallel Constructor *
*************************************************/
Parallel::Parallel(const std::vector<std::string>& names) :
HashFunction(sum_of_hash_lengths(names))
{
for(u32bit j = 0; j != names.size(); ++j)
hashes.push_back(get_hash(names[j]));
}
/*************************************************
* Parallel Destructor *
*************************************************/
Parallel::~Parallel()
{
for(u32bit j = 0; j != hashes.size(); ++j)
delete hashes[j];
}
}
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