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/*
* PBKDF1
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/pbkdf1.h>
#include <botan/exceptn.h>
namespace Botan {
/*
* Return a PKCS#5 PBKDF1 derived key
*/
std::pair<size_t, OctetString>
PKCS5_PBKDF1::key_derivation(size_t key_len,
const std::string& passphrase,
const byte salt[], size_t salt_len,
size_t iterations,
std::chrono::milliseconds msec) const
{
if(key_len > hash->output_length())
throw Invalid_Argument("PKCS5_PBKDF1: Requested output length too long");
hash->update(passphrase);
hash->update(salt, salt_len);
secure_vector<byte> key = hash->final();
const auto start = std::chrono::high_resolution_clock::now();
size_t iterations_performed = 1;
while(true)
{
if(iterations == 0)
{
if(iterations_performed % 8192 == 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;
hash->update(key);
hash->final(&key[0]);
++iterations_performed;
}
return std::make_pair(iterations_performed,
OctetString(&key[0], std::min(key_len, key.size())));
}
}
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