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/*
* IA-32 Serpent
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/serp_ia32.h>
#include <botan/loadstor.h>
namespace Botan {
extern "C" {
void botan_serpent_ia32_encrypt(const byte[16], byte[16], const u32bit[132]);
void botan_serpent_ia32_decrypt(const byte[16], byte[16], const u32bit[132]);
void botan_serpent_ia32_key_schedule(u32bit[140]);
}
/*
* Serpent Encryption
*/
void Serpent_IA32::encrypt_n(const byte in[], byte out[], u32bit blocks) const
{
for(u32bit i = 0; i != blocks; ++i)
{
botan_serpent_ia32_encrypt(in, out, round_key);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/*
* Serpent Decryption
*/
void Serpent_IA32::decrypt_n(const byte in[], byte out[], u32bit blocks) const
{
for(u32bit i = 0; i != blocks; ++i)
{
botan_serpent_ia32_decrypt(in, out, round_key);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/*
* Serpent Key Schedule
*/
void Serpent_IA32::key_schedule(const byte key[], u32bit length)
{
SecureBuffer<u32bit, 140> W;
for(u32bit j = 0; j != length / 4; ++j)
W[j] = make_u32bit(key[4*j+3], key[4*j+2], key[4*j+1], key[4*j]);
W[length / 4] |= u32bit(1) << ((length%4)*8);
botan_serpent_ia32_key_schedule(W);
round_key.copy(W + 8, 132);
}
}
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