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/*************************************************
* PBKDF1 Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#include <botan/pbkdf1.h>
#include <botan/lookup.h>
#include <memory>
namespace Botan {
/*************************************************
* Return a PKCS#5 PBKDF1 derived key *
*************************************************/
OctetString PKCS5_PBKDF1::derive(u32bit key_len,
const std::string& passphrase,
const byte salt[], u32bit salt_size,
u32bit iterations) const
{
if(iterations == 0)
throw Invalid_Argument("PKCS#5 PBKDF1: Invalid iteration count");
std::auto_ptr<HashFunction> hash(get_hash(hash_name));
if(key_len > hash->OUTPUT_LENGTH)
throw Exception("PKCS#5 PBKDF1: Requested output length too long");
hash->update(passphrase);
hash->update(salt, salt_size);
SecureVector<byte> key = hash->final();
for(u32bit j = 1; j != iterations; ++j)
{
hash->update(key);
hash->final(key);
}
return OctetString(key, std::min(key_len, key.size()));
}
/*************************************************
* Return the name of this type *
*************************************************/
std::string PKCS5_PBKDF1::name() const
{
return "PBKDF1(" + hash_name + ")";
}
/*************************************************
* PKCS5_PBKDF1 Constructor *
*************************************************/
PKCS5_PBKDF1::PKCS5_PBKDF1(const std::string& h_name) : hash_name(h_name)
{
if(!have_hash(hash_name))
throw Algorithm_Not_Found(hash_name);
}
}
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