可用于單片機(jī)的DES加密算法

在寫(xiě)設(shè)計(jì)文檔，突然被提起傳輸?shù)臄?shù)據(jù)最好還是加密！惶恐！你知道嗎？單片機(jī)算DES，不是我瘋掉就是單片機(jī)瘋掉！

然后搜了下，感謝各位神仙~居然有這么多實(shí)現(xiàn)過(guò)的，下面是一例。

據(jù)說(shuō)是已經(jīng)測(cè)試通過(guò)的，最早為8位單片設(shè)計(jì)的，我也還沒(méi)測(cè)，先找來(lái)放著，看著也心安。

//以下是des.c文件全部：

//密鑰： B4 31 5B 86 9D 7D FA A2

//數(shù)據(jù)： 1F AD 61 A5 F7 19 77 14

//DES加密結(jié)果：4C 78 E9 1A F2 DA 9C D3

const uint8_t initial_tr[64] =

{

57, 49, 41, 33, 25, 17, 9, 1,

59, 51, 43, 35, 27, 19, 11, 3,

61, 53, 45, 37, 29, 21, 13, 5,

63, 55, 47, 39, 31, 23, 15, 7,

56, 48, 40, 32, 24, 16, 8, 0,

58, 50, 42, 34, 26, 18, 10, 2,

60, 52, 44, 36, 28, 20, 12, 4,

62, 54, 46, 38, 30, 22, 14, 6

};

const uint8_t final_tr[64] =

{

39, 7, 47, 15, 55, 23, 63, 31,

38, 6, 46, 14, 54, 22, 62, 30,

37, 5, 45, 13, 53, 21, 61, 29,

36, 4, 44, 12, 52, 20, 60, 28,

35, 3, 43, 11, 51, 19, 59, 27,

34, 2, 42, 10, 50, 18, 58, 26,

33, 1, 41, 9, 49, 17, 57, 25,

32, 0, 40, 8, 48, 16, 56, 24

};

const uint8_t swap[64] =

{

33, 34, 35, 36, 37, 38, 39, 40,

41, 42, 43, 44, 45, 46, 47, 48,

49, 50, 51, 52, 53, 54, 55, 56,

57, 58, 59, 60, 61, 62, 63, 64,

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

};

const uint8_t key_tr1[56] =

{

56, 48, 40, 32, 24, 16, 8,

0, 57, 49, 41, 33, 25, 17,

9, 1, 58, 50, 42, 34, 26,

18, 10, 2, 59, 51, 43, 35,

62, 54, 46, 38, 30, 22, 14,

6, 61, 53, 45, 37, 29, 21,

13, 5, 60, 52, 44, 36, 28,

20, 12, 4, 27, 19, 11, 3

};

const uint8_t key_tr2[64] =

{

0, 0, 13, 4, 16, 10, 23, 0,

0, 0, 2, 9, 27, 14, 5, 20,

0, 0, 22, 7, 18, 11, 3, 25,

0, 0, 15, 1, 6, 26, 19, 12,

0, 0, 40, 54, 51, 30, 36, 46,

0, 0, 29, 47, 39, 50, 44, 32,

0, 0, 43, 52, 48, 38, 55, 33,

0, 0, 45, 31, 41, 49, 35, 28

};

const uint8_t etr[64] =

{

0, 0, 31, 4, 0, 1, 2, 3,

0, 0, 3, 8, 4, 5, 6, 7,

0, 0, 7, 12, 8, 9, 10, 11,

0, 0, 11, 16, 12, 13, 14, 15,

0, 0, 15, 20, 16, 17, 18, 19,

0, 0, 19, 24, 20, 21, 22, 23,

0, 0, 23, 28, 24, 25, 26, 27,

0, 0, 27, 0, 28, 29, 30, 31

};

const uint8_t ptr[32] =

{

31, 14, 39, 44, 60, 23, 55, 36,

4, 30, 46, 53, 12, 37, 62, 21,

5, 15, 47, 29, 63, 54, 6, 20,

38, 28, 61, 13, 45, 22, 7, 52

};

const uint8_t s[8][64] =

{

{

14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,

0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,

4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,

15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13

},

{

15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,

3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,

0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,

13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9

},

{

10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,

13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,

13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,

1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12

},

{

7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,

13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,

10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,

3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14

},

{

2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,

14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,

4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,

11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3

},

{

12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,

10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,

9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,

4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13

},

{

4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,

13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,

1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,

6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12

},

{

13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,

1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,

7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,

2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11

}

};

const uint8_t rots[16] =

{

1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1

};

const uint8_t bit_msk[8] =

{

0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01

};

uint8_t DES_Encrypt_key[8];

uint8_t DES_Decrypt_key[8];

uint8_t sub_keys[16][8]; //sub_keys[16][8]

uint8_t main_key[8];

void des(uint8_t*, uint8_t*, uint8_t, uint8_t*);

void FLASH_Read_KEYS(uint8_t key_index);

static void transpose (uint8_t*, uint8_t*, const uint8_t*, uint8_t);

static void rotate_l (uint8_t*);

static void compute_subkeys (uint8_t*);

static void f (uint8_t*, uint8_t*, uint8_t*);

/************************************************************************/

/* */

/* Module title: des */

/* Module type: des mainrutine */

/* */

/* Author: YXH */

/* Date: 2012-07-13 */

/* */

/* Last changed by: YXH */

/* Date: 2012-07-13 */

/* */