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/*
* PBKDF1
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/internal/pbkdf_utils.h>
#include <botan/pbkdf1.h>
#include <botan/exceptn.h>
namespace Botan {
BOTAN_REGISTER_PBKDF_1HASH(PKCS5_PBKDF1, "PBKDF1");
size_t PKCS5_PBKDF1::pbkdf(byte output_buf[], size_t output_len,
const std::string& passphrase,
const byte salt[], size_t salt_len,
size_t iterations,
std::chrono::milliseconds msec) const
{
if(output_len > m_hash->output_length())
throw Invalid_Argument("PKCS5_PBKDF1: Requested output length too long");
m_hash->update(passphrase);
m_hash->update(salt, salt_len);
secure_vector<byte> key = m_hash->final();
const auto start = std::chrono::high_resolution_clock::now();
size_t iterations_performed = 1;
while(true)
{
if(iterations == 0)
{
if(iterations_performed % 10000 == 0)
{
auto time_taken = std::chrono::high_resolution_clock::now() - start;
auto msec_taken = std::chrono::duration_cast<std::chrono::milliseconds>(time_taken);
if(msec_taken > msec)
break;
}
}
else if(iterations_performed == iterations)
break;
m_hash->update(key);
m_hash->final(key.data());
++iterations_performed;
}
copy_mem(output_buf, key.data(), output_len);
return iterations_performed;
}
}
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