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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
*/
OctetString PKCS5_PBKDF1::derive_key(size_t key_len,
const std::string& passphrase,
const byte salt[], size_t salt_size,
size_t iterations) const
{
if(iterations == 0)
throw Invalid_Argument("PKCS5_PBKDF1: Invalid iteration count");
if(key_len > hash->output_length())
throw Invalid_Argument("PKCS5_PBKDF1: Requested output length too long");
hash->update(passphrase);
hash->update(salt, salt_size);
secure_vector<byte> key = hash->final();
for(size_t j = 1; j != iterations; ++j)
{
hash->update(key);
hash->final(&key[0]);
}
return OctetString(&key[0], std::min<size_t>(key_len, key.size()));
}
}
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