/*

* DES

* (C) 1999-2007 Jack Lloyd

*

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

*/

#include <botan/desx.h>

namespace Botan {

/*

* DESX Encryption

*/

void DESX::encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const

   {

   verify_key_set(m_K1.empty() == false);

   for(size_t i = 0; i != blocks; ++i)

      {

      xor_buf(out, in, m_K1.data(), BLOCK_SIZE);

      m_des.encrypt(out);

      xor_buf(out, m_K2.data(), BLOCK_SIZE);

      in += BLOCK_SIZE;

      out += BLOCK_SIZE;

      }

   }

/*

* DESX Decryption

*/

void DESX::decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const

   {

   verify_key_set(m_K1.empty() == false);

   for(size_t i = 0; i != blocks; ++i)

      {

      xor_buf(out, in, m_K2.data(), BLOCK_SIZE);

      m_des.decrypt(out);

      xor_buf(out, m_K1.data(), BLOCK_SIZE);

      in += BLOCK_SIZE;

      out += BLOCK_SIZE;

      }

   }

/*

* DESX Key Schedule

*/

void DESX::key_schedule(const uint8_t key[], size_t)

   {

   m_K1.assign(key, key + 8);

   m_des.set_key(key + 8, 8);

   m_K2.assign(key + 16, key + 24);

   }

void DESX::clear()

   {

   m_des.clear();

   zap(m_K1);

   zap(m_K2);

   }

}