src/lib/kdf/kdf1/kdf1.cpp


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/*
* KDF1
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/internal/kdf_utils.h>
#include <botan/kdf1.h>

namespace Botan {

BOTAN_REGISTER_KDF_1HASH(KDF1, "KDF1");

size_t KDF1::kdf(byte key[], size_t key_len,
                 const byte secret[], size_t secret_len,
                 const byte salt[], size_t salt_len) const
   {
   m_hash->update(secret, secret_len);
   m_hash->update(salt, salt_len);

   if(key_len < m_hash->output_length())
      {
      secure_vector<byte> v = m_hash->final();
      copy_mem(key, &v[0], key_len);
      return key_len;
      }

   m_hash->final(key);
   return m_hash->output_length();
   }

}