📄 des.c
字号:
/////////////////////////////////////////////////////////////////////////////
unsigned char xdata gcSubKey[16][6];
//////////////////////////////////////////////////////////////////////////////
// DES调用接口
//////////////////////////////////////////////////////////////////////////////
void SetKey(unsigned char *pInkey)
{
unsigned char code bitDisplace[16] = {1,1,2,2, 2,2,2,2, 1,2,2,2, 2,2,2,1};
unsigned char xdata outData56[7], key28l[4], key28r[4], key56o[7];
unsigned char i;
PermutationChoose1(pInkey, outData56);
key28l[0] = outData56[0] >> 4;
key28l[1] = (outData56[0] << 4) | (outData56[1] >> 4);
key28l[2] = (outData56[1] << 4) | (outData56[2] >> 4);
key28l[3] = (outData56[2] << 4) | (outData56[3] >> 4);
key28r[0] = outData56[3] & 0x0f;
key28r[1] = outData56[4];
key28r[2] = outData56[5];
key28r[3] = outData56[6];
for(i=0; i<16; i++)
{
CycleMove(key28l, bitDisplace[i]);
CycleMove(key28r, bitDisplace[i]);
key56o[0] = (key28l[0] << 4) | (key28l[1] >> 4);
key56o[1] = (key28l[1] << 4) | (key28l[2] >> 4);
key56o[2] = (key28l[2] << 4) | (key28l[3] >> 4);
key56o[3] = (key28l[3] << 4) | (key28r[0]);
key56o[4] = key28r[1];
key56o[5] = key28r[2];
key56o[6] = key28r[3];
PermutationChoose2(key56o, &gcSubKey[i][0]);
}
}
void Encrypt(unsigned char *pInData, unsigned char *pOut)// inData, outData 都为8Bytes，否则出错
{
unsigned char xdata temp[4], buf[4];
char i, j;
for(i=0; i<8; i++)
pOut[i] = pInData[i];
InitPermutation(pOut);
for(i=0; i<16; i++)
{
for(j=0; j<4; j++)
temp[j] = pOut[j]; //temp = Ln
for(j=0; j<4; j++)
pOut[j] = pOut[j + 4]; //Ln+1 = Rn
DESCalc(pOut, &gcSubKey[i][0], buf); //Rn ==Kn==> buf
for(j=0; j<4; j++)
pOut[j + 4] = temp[j] ^ buf[j]; //Rn+1 = Ln^buf
}
for(j=0; j<4; j++)
temp[j] = pOut[j + 4];
for(j=0; j<4; j++)
pOut[j + 4] = pOut[j];
for(j=0; j<4; j++)
pOut[j] = temp[j];
ConversePermutation(pOut);
}
void Decrypt(unsigned char *pInData, unsigned char *pOut)// inData, outData 都为8Bytes，否则出错
{
unsigned char xdata temp[4], buf[4];
char i, j;
for(i=0; i<8; i++)
pOut[i] = pInData[i];
InitPermutation(pOut);
for(i=15; i>=0; i--)
{
for(j=0; j<4; j++)
temp[j] = pOut[j];
for(j=0; j<4; j++)
pOut[j] = pOut[j + 4];
DESCalc(pOut, &gcSubKey[i][0], buf);
for(j=0; j<4; j++)
pOut[j + 4] = temp[j] ^ buf[j];
}
for(j=0; j<4; j++)
temp[j] = pOut[j + 4];
for(j=0; j<4; j++)
pOut[j + 4] = pOut[j];
for(j=0; j<4; j++)
pOut[j] = temp[j];
ConversePermutation(pOut);
}
//////////////////////////////////////////////////////////////////////////////
// DES特征数据
//////////////////////////////////////////////////////////////////////////////
unsigned char code BitIP[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
};
unsigned char code BitCP[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
};
unsigned char code BitExp[48] =
{
31, 0, 1, 2, 3, 4, 3, 4, 5, 6, 7, 8, 7, 8, 9,10,
11,12,11,12,13,14,15,16,15,16,17,18,19,20,19,20,
21,22,23,24,23,24,25,26,27,28,27,28,29,30,31,0
};
unsigned char code BitPM[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
};
unsigned char code sBox[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
}
};
unsigned char code BitPMC1[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
};
unsigned char code BitPMC2[48] =
{
13, 16, 10, 23, 0, 4,
2, 27, 14, 5, 20, 9,
22, 18, 11, 3, 25, 7,
15, 6, 26, 19, 12, 1,
40, 51, 30, 36, 46, 54,
29, 39, 50, 44, 32, 47,
43, 48, 38, 55, 33, 52,
45, 41, 49, 35, 28, 31
};
//////////////////////////////////////////////////////////////////////////////
// DES算法实现
//////////////////////////////////////////////////////////////////////////////
void DESCalc(unsigned char *pInData, unsigned char *pParity, unsigned char *pOut)
{
unsigned char xdata outBuf[6], buf[8], c;
unsigned char i;
Expand(pInData, outBuf);
for(i=0; i<6; i++)
outBuf[i] = outBuf[i] ^ pParity[i];
// outBuf xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx
buf[0] = outBuf[0] >> 2; //xxxxxx -> 2
buf[1] = ((outBuf[0] & 0x03) << 4) | (outBuf[1] >> 4); // 4 <- xx xxxx -> 4
buf[2] = ((outBuf[1] & 0x0f) << 2) | (outBuf[2] >> 6); // 2 <- xxxx xx -> 6
buf[3] = outBuf[2] & 0x3f; // xxxxxx
buf[4] = outBuf[3] >> 2; // xxxxxx
buf[5] = ((outBuf[3] & 0x03) << 4) | (outBuf[4] >> 4); // xx xxxx
buf[6] = ((outBuf[4] & 0x0f) << 2) | (outBuf[5] >> 6); // xxxx xx
buf[7] = outBuf[5] & 0x3f; // xxxxxx
for(i=0; i<8; i++)
{
c = (buf[i] & 0x20) | ((buf[i] & 0x1e) >> 1) | ((buf[i] & 0x01) << 4);
buf[i] = sBox[i][c] & 0x0f;
}
for(i=0; i<4; i++)
outBuf[i] = (buf[i << 1] << 4) | buf[(i << 1) | 1];
Permutation(outBuf);
for(i=0; i<4; i++)
pOut[i] = outBuf[i];
}
void InitPermutation(unsigned char *pInData)
{
unsigned char xdata newData[8];
unsigned char i;
for(i=0; i<8; i++)
newData[i] = 0;
for(i=0; i<64; i++)
if((pInData[BitIP[i] >> 3] & (1 << (7- (BitIP[i] & 0x07)))) != 0)
newData[i >> 3] = newData[i >> 3] | (1 << (7 - (i & 0x07)));
for(i=0; i<8; i++)
pInData[i] = newData[i];
}
void ConversePermutation(unsigned char *pInData)
{
unsigned char xdata newData[8];
unsigned char i;
for(i=0; i<8; i++)
newData[i] = 0;
for(i=0; i<64; i++)
if((pInData[BitCP[i] >> 3] & (1 << (7 - (BitCP[i] & 0x07))))!=0)
newData[i >> 3] = newData[i >> 3] | (1 << (7 - (i & 0x07)));
for(i=0; i<8; i++)
pInData[i] = newData[i];
}
void Expand(unsigned char *pInData, unsigned char *pOut)
{
unsigned char i;
for(i=0; i<6; i++)
pOut[i] = 0;
for(i=0; i<48; i++)
if((pInData[BitExp[i] >> 3] & (1 << (7 - (BitExp[i] & 0x07))))!=0)
pOut[i >> 3] = pOut[i >> 3] | (1 << (7 - (i & 0x07)));
}
void Permutation(unsigned char *pInData)
{
unsigned char xdata newData[4];
unsigned char i;
for(i=0; i<4; i++)
newData[i] = 0;
for(i=0; i<32; i++)
if((pInData[BitPM[i] >> 3] & (1 << (7 - (BitPM[i] & 0x07)))) != 0)
newData[i >> 3] = newData[i >> 3] | (1 << (7 - (i & 0x07)));
for(i=0; i<4; i++)
pInData[i] = newData[i];
}
void PermutationChoose1(unsigned char *pInData, unsigned char *pOut)
{
unsigned char i;
for(i=0; i<7; i++)
pOut[i] = 0;
for(i=0; i<56; i++)
if((pInData[BitPMC1[i] >> 3] & (1 << (7 - (BitPMC1[i] & 0x07)))) != 0)
pOut[i >> 3] = pOut[i >> 3] | (1 << (7 - (i & 0x07)));
}
void PermutationChoose2(unsigned char *pInData, unsigned char *pParity)
{
unsigned char i;
for(i=0; i<6; i++)
pParity[i] = 0;
for(i=0; i<48; i++)
if((pInData[BitPMC2[i] >> 3] & (1 << (7 - (BitPMC2[i] & 0x07))))!=0)
pParity[i >> 3] = pParity[i >> 3] | (1 << (7 - (i & 0x07)));
}
void CycleMove(unsigned char *pInData, unsigned char bitMove)
{
unsigned char i;
for(i=0; i<bitMove; i++)
{
pInData[0] = (pInData[0] << 1) | (pInData[1] >> 7);
pInData[1] = (pInData[1] << 1) | (pInData[2] >> 7);
pInData[2] = (pInData[2] << 1) | (pInData[3] >> 7);
pInData[3] = (pInData[3] << 1) | ((pInData[0] & 0x10) >> 4);
pInData[0] = (pInData[0] & 0x0f);
}
}
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -