/*

* KDF1

* (C) 1999-2007 Jack Lloyd

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#include <botan/kdf1.h>

namespace Botan {

size_t KDF1::kdf(uint8_t key[], size_t key_len,

                 const uint8_t secret[], size_t secret_len,

                 const uint8_t salt[], size_t salt_len,

                 const uint8_t label[], size_t label_len) const

   {

   m_hash->update(secret, secret_len);

   m_hash->update(label, label_len);

   m_hash->update(salt, salt_len);

   if(key_len < m_hash->output_length())

      {

      secure_vector<uint8_t> v = m_hash->final();

      copy_mem(key, v.data(), key_len);

      return key_len;

      }

   m_hash->final(key);

   return m_hash->output_length();

   }

}