用C编写DES加密算法这是那个100行的经典代码#include /* DES VERSION 0.4 CREATED BY SIMPLE SOURCE AT 2007.3 *//* COMPETENCE : * P4 3.0G 512M * 3000000 TIMES ENCRYPTION WITH CREATED SUBKEYS * 26.784 SECONDS (ABOUT 0.85M/S)*/static __int64 g_arrayMask[64] = {
0x0000000000000001, 0x0000000000000002, 0x0000000000000004, 0x0000000000000008,
0x0000000000000010, 0x0000000000000020, 0x0000000000000040, 0x0000000000000080,
0x0000000000000100, 0x0000000000000200, 0x0000000000000400, 0x0000000000000800,
0x0000000000001000, 0x0000000000002000, 0x0000000000004000, 0x0000000000008000,
0x0000000000010000, 0x0000000000020000, 0x0000000000040000, 0x0000000000080000,
0x0000000000100000, 0x0000000000200000, 0x0000000000400000, 0x0000000000800000,
0x0000000001000000, 0x0000000002000000, 0x0000000004000000, 0x0000000008000000,
0x0000000010000000, 0x0000000020000000, 0x0000000040000000, 0x0000000080000000,
0x0000000100000000, 0x0000000200000000, 0x0000000400000000, 0x0000000800000000,
0x0000001000000000, 0x0000002000000000, 0x0000004000000000, 0x0000008000000000,
0x0000010000000000, 0x0000020000000000, 0x0000040000000000, 0x0000080000000000,
0x0000100000000000, 0x0000200000000000, 0x0000400000000000, 0x0000800000000000,
0x0001000000000000, 0x0002000000000000, 0x0004000000000000, 0x0008000000000000,
0x0010000000000000, 0x0020000000000000, 0x0040000000000000, 0x0080000000000000,
0x0100000000000000, 0x0200000000000000, 0x0400000000000000, 0x0800000000000000,
0x1000000000000000, 0x2000000000000000, 0x4000000000000000, 0x8000000000000000};static int g_arrayIP[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 };static int g_arrayE[64] = {
31,0,1,2,3,4, -1, -1,
3,4,5,6,7,8, -1, -1,
7,8,9, 10, 11, 12, -1, -1,
11, 12, 13, 14, 15, 16, -1, -1,
15, 16, 17, 18, 19, 20, -1, -1,
19, 20, 21, 22, 23, 24, -1, -1,
23, 24, 25, 26, 27, 28, -1, -1,
27, 28, 29, 30, 31, 30, -1, -1};static char g_matrixNSBox[8][64] = {
{
14,4,3, 15,2, 13,5,3,
13, 14,6,9, 11,2,0,5,
4,1, 10, 12, 15,6,9, 10,
1,8, 12,7,8, 11,7,0,
0, 15, 10,5, 14,4,9, 10,
7,8, 12,3, 13,1,3,6,
15, 12,6, 11,2,9,5,0,
4,2, 11, 14,1,7,8, 13
},
{
15,0,9,5,6, 10, 12,9,
8,7,2, 12,3, 13,5,2,
1, 14,7,8, 11,4,0,3,
14, 11, 13,6,4,1, 10, 15,
3, 13, 12, 11, 15,3,6,0,
4, 10,1,7,8,4, 11, 14,
13,8,0,6,2, 15,9,5,
7,1, 10, 12, 14,2,5,9
},
{
10, 13,1, 11,6,8, 11,5,
9,4, 12,2, 15,3,2, 14,
0,6, 13,1,3, 15,4, 10,
14,9,7, 12,5,0,8,7,
13,1,2,4,3,6, 12, 11,
0, 13,5, 14,6,8, 15,2,
7, 10,8, 15,4,9, 11,5,
9,0, 14,3, 10,7,1, 12
},
{
7, 10,1, 15,0, 12, 11,5,
14,9,8,3,9,7,4,8,
13,6,2,1,6, 11, 12,2,
3,0,5, 14, 10, 13, 15,4,
13,3,4,9,6, 10,1, 12,
11,0,2,5,0, 13, 14,2,
8, 15,7,4, 15,1, 10,7,
5,6, 12, 11,3,8,9, 14
},
{
2,4,8, 15,7, 10, 13,6,
4,1,3, 12, 11,7, 14,0,
12,2,5,9, 10, 13,0,3,
1, 11, 15,5,6,8,9, 14,
14, 11,5,6,4,1,3, 10,
2, 12, 15,0, 13,2,8,5,
11,8,0, 15,7, 14,9,4,
12,7, 10,9,1, 13,6,3
},
{
12,9,0,7,9,2, 14,1,
10, 15,3,4,6, 12,5, 11,
1, 14, 13,0,2,8,7, 13,
15,5,4, 10,8,3, 11,6,
10,4,6, 11,7,9,0,6,
4,2, 13,1,9, 15,3,8,
15,3,1, 14, 12,5, 11,0,
2, 12, 14,7,5, 10,8, 13
},
{
4,1,3, 10, 15, 12,5,0,
2, 11,9,6,8,7,6,9,
11,4, 12, 15,0,3, 10,5,
14, 13,7,8, 13, 14,1,2,
13,6, 14,9,4,1,2, 14,
11, 13,5,0,1, 10,8,3,
0, 11,3,5,9,4, 15,2,
7,8, 12, 15, 10,7,6, 12
},
{
13,7, 10,0,6,9,5, 15,
8,4,3, 10, 11, 14, 12,5,
2, 11,9,6, 15, 12,0,3,
4,1, 14, 13,1,2,7,8,
1,2, 12, 15, 10,4,0,3,
13, 14,6,9,7,8,9,6,
15,1,5, 12,3, 10, 14,5,
8,7, 11,0,4, 13,2, 11
},};static int g_arrayP[32] = {
15,6, 19, 20, 28, 11, 27, 16,
0, 14, 22, 25,4, 17, 30,9,
1,7, 23, 13, 31, 26,2,8,
18, 12, 29,5, 21, 10,3, 24};static int g_arrayIP_1[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};static int g_arrayPC_1[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};static int g_arrayPC_2[64] = {
13, 16, 10, 23,0,4, -1, -1,
2, 27, 14,5, 20,9, -1, -1,
22, 18, 11,3, 25,7, -1, -1,
15,6, 26, 19, 12,1, -1, -1,
40, 51, 30, 36, 46, 54, -1, -1,
29, 39, 50, 44, 32, 47, -1, -1,
43, 48, 38, 55, 33, 52, -1, -1,
45, 41, 49, 35, 28, 31, -1, -1};static int g_arrayLs[16] = {1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1};static __int64 g_arrayLsMask[3] = {
0x0000000000000000,
0x0000000000100001,
0x0000000000300003};#define BitTransform(array, len, source, dest) \{\
__int64 bts = source;\
int bti;\
dest = 0;\
for(bti = 0; bti = 0 && (bts & g_arrayMask[array[bti]]))\
{\
dest |= g_arrayMask[bti];\
}\
}\}#define DES_MODE_ENCRYPT
0#define DES_MODE_DECRYPT
1void DESSubKeys(__int64 key, __int64 K[16], int mode);__int64 DES64(__int64 subkeys[16], __int64 data);void DESSubKeys(__int64 key, __int64 K[16], int mode){
__int64 temp;
int j;
/* PC-1变换 */
BitTransform(g_arrayPC_1, 56, key, temp);
for(j = 0; j > g_arrayLs[j]);
}
/* PC-2变换 */
BitTransform(g_arrayPC_2, 64, temp, K[j]);
}
if(mode == DES_MODE_DECRYPT) /* 如果解密则反转子密钥顺序 */
{
__int64 t;
for(j = 0; j = 0; sbi--)
{
SOut <<= 4;
SOut |= g_matrixNSBox[sbi][pR[sbi]];
}
R = SOut;
}
/* P变换 */
{
BitTransform(g_arrayP, 32, R, R);
}
}
/* f变换完成 */
L = pSource[0];
pSource[0] = pSource[1];
pSource[1] = (__int32)(L ^ R);
}
/* 交换高低32位 */
{
t = pSource[0];
pSource[0] = pSource[1];
pSource[1] = t;
}
}
/* IP-1变换 */
{
BitTransform(g_arrayIP_1, 64, out, out);
}
return out;} |
