DES加密算法的C语言实现
#include <stdio.h>
/* 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 < len; bti++)/
{/
if(array[bti] >= 0 && (bts & g_arrayMask[array[bti]]))/
{/
dest |= g_arrayMask[bti];/
}/
}/
}
#define DES_MODE_ENCRYPT 0
#define DES_MODE_DECRYPT 1
void 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 < 16; j++)
{
/* 循环左移 */
{
__int64 source = temp;
temp = ((source & g_arrayLsMask[g_arrayLs[j]]) << (28 - g_arrayLs[j])) | ((source & ~g_arrayLsMask[g_arrayLs[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 < 8; j++)
{
t = K[j];
K[j] = K[15 - j];
K[15 - j] = t;
}
}
}
__int64 DES64(__int64 subkeys[16], __int64 data)
{
static __int64 out;
static __int64 source;
static __int64 L, R;
static __int32 * pSource;
static char * pR;
static int i;
static __int32 SOut;
static __int32 t;
static int sbi;
pSource = (__int32 *)&out;
pR = (char *)&R;
/* IP变换 */
{
BitTransform(g_arrayIP, 64, data, out);
}
/* 主迭代 */
{
//source = out;
for(i = 0; i < 16; i++)
{
R = pSource[1];
/* F变换开始 */
{
/* E变换 */
{
BitTransform(g_arrayE, 64, R, R);
}
/* 与子密钥异或 */
R ^= subkeys[i];
/* S盒变换 */
{
SOut = 0;
for(sbi = 7; sbi >= 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;
}