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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>
#include <botan/internal/xor_buf.h>
namespace Botan {
/*
* DESX Encryption
*/
void DESX::encrypt_n(const byte in[], byte out[], size_t blocks) const
{
for(size_t i = 0; i != blocks; ++i)
{
xor_buf(out, in, &K1[0], BLOCK_SIZE);
des.encrypt(out);
xor_buf(out, &K2[0], BLOCK_SIZE);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/*
* DESX Decryption
*/
void DESX::decrypt_n(const byte in[], byte out[], size_t blocks) const
{
for(size_t i = 0; i != blocks; ++i)
{
xor_buf(out, in, &K2[0], BLOCK_SIZE);
des.decrypt(out);
xor_buf(out, &K1[0], BLOCK_SIZE);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/*
* DESX Key Schedule
*/
void DESX::key_schedule(const byte key[], size_t)
{
K1.assign(key, key + 8);
des.set_key(key + 8, 8);
K2.assign(key + 16, key + 24);
}
void DESX::clear()
{
des.clear();
zap(K1);
zap(K2);
}
}
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