1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
/*************************************************
* IA-32 Serpent Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#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::enc(const byte in[], byte out[]) const
{
botan_serpent_ia32_encrypt(in, out, round_key);
}
/*************************************************
* Serpent Decryption *
*************************************************/
void Serpent_IA32::dec(const byte in[], byte out[]) const
{
botan_serpent_ia32_decrypt(in, out, round_key);
}
/*************************************************
* 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);
}
}
|
