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/*
* 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);
}
}