text: /*
  * 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();
     }
  
  }
  