DES数据加密32位简化版 (amobbs.com 阿莫电子技术论坛) -

blavy 发表于 2011-12-6 16:17:12

DES数据加密32位简化版

RT：
原来的DES加密是64位的，网上找不到32位的，于是根据那个64位的改了个32位的。
程序为32位密钥加解密32位明文。

//密钥去除校验位位移表
uint8_t PC_1 = {
24,16,8,0,25,17,9,
1,26,18,10,2,27,19,
30,22,14,6,29,21,13,
5,28,20,12,4,11,3
};

uint8_t MOVE_TIMES = {1,1,2,2,1,2,2,1};

//密钥28位转24位位移表
uint8_t PC_2 = {
7,16,5,12,0,9,
14,3,24,13,20,27,
1,22,25,2,21,11,
23,15,6,19,8,18
};
//数据明文位移表
uint8_t IP_Table = {
25,17,9,1,
27,19,11,3,
29,21,13,5,
31,23,15,7,
24,16,8,0,
26,18,10,2,
28,20,12,4,
30,22,14,6
};

//数据扩充表
uint8_t E_Table = {
15,0,1,2,3,4,
3,4,5,6,7,8,
7,8,9,10,11,12,
11,12,13,14,15,0
};

//S迭代盒
uint8_t S =
// S1
{{{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}},
// S2
{{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}},
//S3
{{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}},
// S4
{{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}}
};

//置换函数P
uint8_t P_Table = {
8,3,10,11,
14,4,13,6,
15,12,0,2,
9,7,1,5
};

//逆初始置换表
uint8_t IP_1_Table = {
19,3,23,7,27,11,31,15,
18,2,22,6,26,10,30,14,
17,1,21,5,25,9,29,13,
16,0,20,4,24,8,28,12
};

//字节转换成二进制
uint8_t ByteToBit(uint8_t ch, uint8_t bit)
{
uint8_t cnt;
for(cnt = 0;cnt < 8; cnt++)
{
   *(bit+cnt) = (ch>>cnt)&1;
}
return 0;
}

// 二进制转换成字节
uint8_t BitToByte(uint8_t bit,uint8_t *ch)
{
uint8_t cnt;
for(cnt = 0;cnt < 8; cnt++)
{
   *ch |= *(bit + cnt)<<cnt;
}
return 0;
}

// 将长度为8的字符串转为二进制位串
uint8_t Char8ToBit64(uint8_t ch,uint8_t bit)
{
uint8_t cnt;
for(cnt = 0; cnt < 4; cnt++)
{
   ByteToBit(*(ch+cnt),bit+(cnt<<3));
}
return 0;
}

// 将二进制位串转为长度为8的字符串
uint8_t Bit64ToChar8(uint8_t bit,uint8_t ch)
{
uint8_t cnt;
memset(ch,0,8);
for(cnt = 0; cnt < 4; cnt++)
{
   BitToByte(bit+(cnt<<3),ch+cnt);
}
return 0;
}

// 密钥置换1
uint8_t DES_PC1_Transform(uint8_t key, uint8_t tempbts)
{
uint8_t cnt;
for(cnt = 0; cnt < 28; cnt++)
{
   tempbts = key];
}
return 0;
}

//密钥置换2
uint8_t DES_PC2_Transform(uint8_t key, uint8_t tempbts)
{
uint8_t cnt;
for(cnt = 0; cnt < 24; cnt++)
{
   tempbts = key];
}
return 0;
}

//循环左移
uint8_t DES_ROL(uint8_t data, uint8_t time)
{
uint8_t temp;
//保存将要循环移动到右边的位
memcpy(temp,data,time);
memcpy(temp+time,data+14,time);
//前28位移动
memcpy(data,data+time,14-time);
memcpy(data+14-time,temp,time);
//后28位移动
memcpy(data+14,data+14+time,14-time);
memcpy(data+28-time,temp+time,time);
return 0;
}

//IP置换
uint8_t DES_IP_Transform(uint8_t data)
{
uint8_t cnt;
uint8_t temp;
for(cnt = 0; cnt < 32; cnt++)
{
   temp = data];
}
memcpy(data,temp,32);
return 0;
}

// IP逆置换
uint8_t DES_IP_1_Transform(uint8_t data)
{
uint8_t cnt;
uint8_t temp;
for(cnt = 0; cnt < 32; cnt++)
{
   temp = data];
}
memcpy(data,temp,32);
return 0;
}

//扩展置换
uint8_t DES_E_Transform(uint8_t data)
{
uint8_t cnt;
uint8_t temp;
for(cnt = 0; cnt < 24; cnt++)
{
   temp = data];
}
memcpy(data,temp,24);
return 0;
}

//P置换
uint8_t DES_P_Transform(uint8_t data)
{
uint8_t cnt;
uint8_t temp;
for(cnt = 0; cnt < 16; cnt++)
{
   temp = data];
}
memcpy(data,temp,16);
return 0;
}

// 异或
uint8_t DES_XOR(uint8_t R, uint8_t L ,uint8_t count)
{
uint8_t cnt;
for(cnt = 0; cnt < count; cnt++)
{
   R ^= L;
}
return 0;
}

// S盒置换
uint8_t DES_SBOX(uint8_t data)
{
uint8_t cnt;
uint8_t line,row,output;
uint8_t cur1,cur2;
for(cnt = 0; cnt < 4; cnt++)
{
   cur1 = cnt*6;
   cur2 = cnt<<2;
   // 计算在S盒中的行与列
   line = (data<<1) + data;
   row = (data<<3) + (data<<2)
         + (data<<1) + data;
   output = S;
   // 化为2进制
   data = (output&0X08)>>3;
data = (output&0X04)>>2;
   data = (output&0X02)>>1;
   data = output&0x01;
}
return 0;
}

//交换
uint8_t DES_Swap(uint8_t left, uint8_t right)
{
uint8_t temp;
memcpy(temp,left,16);
memcpy(left,right,16);
memcpy(right,temp,16);
return 0;
}

//生成子密钥
uint8_t DES_MakeSubKeys(uint8_t key,uint8_t subKeys)
{
uint8_t temp;
uint8_t cnt;
DES_PC1_Transform(key,temp);// PC1置换
for(cnt = 0; cnt < 8; cnt++) //16轮跌代，产生16个子密钥
{
DES_ROL(temp,MOVE_TIMES);// 循环左移
DES_PC2_Transform(temp,subKeys);//PC2置换，产生子密钥
}
return 0;
}

//加密单个分组
uint8_t DES_EncryptBlock(uint8_t plainBlock, uint8_t subKeys, uint8_t cipherBlock)
{
uint8_t plainBits;
uint8_t copyRight;
uint8_t cnt;
Char8ToBit64(plainBlock,plainBits);
//初始置换（IP置换）
DES_IP_Transform(plainBits);
// 16轮迭代
for(cnt = 0; cnt < 8; cnt++)
{
   memcpy(copyRight,plainBits+16,16);
   DES_E_Transform(copyRight); // 将右半部分进行扩展置换，从32位扩展到48位
   DES_XOR(copyRight,subKeys,24); // 将右半部分与子密钥进行异或操作
   DES_SBOX(copyRight); // 异或结果进入S盒，输出32位结果
   DES_P_Transform(copyRight); // P置换
   DES_XOR(plainBits,copyRight,16); //将明文左半部分与右半部分进行异或
   if(cnt != 7)
{
         DES_Swap(plainBits,plainBits+16);//最终完成左右部的交换
   }
}
DES_IP_1_Transform(plainBits); //逆初始置换（IP^1置换）
Bit64ToChar8(plainBits,cipherBlock);
return 0;
}

// 解密单个分组
uint8_t DES_DecryptBlock(uint8_t cipherBlock, uint8_t subKeys,uint8_t plainBlock)
{
uint8_t cipherBits;
uint8_t copyRight;
int8_t cnt;
Char8ToBit64(cipherBlock,cipherBits);
//初始置换（IP置换）
DES_IP_Transform(cipherBits);
// 16轮迭代
for(cnt = 7; cnt >= 0; cnt--)
{
   memcpy(copyRight,cipherBits+16,16);
   //将右半部分进行扩展置换，从32位扩展到48位
   DES_E_Transform(copyRight);
   // 将右半部分与子密钥进行异或操作
   DES_XOR(copyRight,subKeys,24);
   //异或结果进入S盒，输出32位结果
   DES_SBOX(copyRight);
   // P置换
   DES_P_Transform(copyRight);
   //将明文左半部分与右半部分进行异或
   DES_XOR(cipherBits,copyRight,16);
   if(cnt != 0)
{
         // 最终完成左右部的交换
         DES_Swap(cipherBits,cipherBits+16);
   }
}
// 逆初始置换（IP^1置换）
DES_IP_1_Transform(cipherBits);
Bit64ToChar8(cipherBits,plainBlock);
return 0;
}

//加密文件
uint8_t DES_Encrypt(uint8_t *plainFile, uint8_t *keyStr,uint8_t *cipherFile)
{
uint8_t keyBlock,bKey,subKeys;

memcpy(keyBlock,keyStr,4); // 设置密钥
Char8ToBit64(keyBlock,bKey); // 将密钥转换为二进制流
DES_MakeSubKeys(bKey,subKeys);    //生成子密钥

DES_EncryptBlock(plainFile,subKeys,cipherFile);
return OK;
}

//解密文件
uint8_t DES_Decrypt(uint8_t *cipherFile, uint8_t *keyStr,uint8_t *plainFile)
{
// uint8_t plainBlock,cipherBlock,
uint8_t bKey,keyBlock,subKeys;

memcpy(keyBlock,keyStr,4); //设置密钥
Char8ToBit64(keyBlock,bKey); //将密钥转换为二进制流
DES_MakeSubKeys(bKey,subKeys); //生成子密钥

DES_DecryptBlock(cipherFile,subKeys,plainFile);
return OK;
}

下面两个函数为内存拷贝相关的库函数，已修改过，只需引用即可。

void *memcpy( void *dest, const void *src, uint8_t count )
{
uint8_t *temp_dest = (uint8_t *)dest;
uint8_t *temp_src = (uint8_t *)src;
while(count--)// 不对是否存在重叠区域进行判断
{
*temp_dest++ = *temp_src++;
}
return dest;
}
uint8_t *memset(uint8_t *dst,uint8_t value,uint8_t count)
{
uint8_t *start = dst;
while (count--)
*dst++ = value;
return(start);
}

main(void)
{
uint8_t mingwen = "TIZY";
uint8_t miyao = "!@#$";
uint8_t miwen,jiemi;

DES_Encrypt(mingwen, miyao,miwen);
DES_Decrypt(miwen, miyao,jiemi);
}

另附上64位的加解密程序文件
加解密主文件，调用与32位的一样。ourdev_702153RU0T3B.txt(文件大小:10K) (原文件名:des.txt)
内存拷贝库文件ourdev_702154DVX2KZ.txt(文件大小:515字节) (原文件名:memcpy.txt)

rafd 发表于 2011-12-6 16:20:02

记号

wzyllgx 发表于 2011-12-6 16:53:44

好东西

ljqlaq 发表于 2012-2-3 02:02:36

mark，好东西，收下了

haigerl 发表于 2012-2-8 10:19:54

mark DES 32bit

migzan 发表于 2012-2-8 10:24:01

MARK

wuguoyan 发表于 2012-2-8 10:37:42

MARK

inkfish321 发表于 2012-2-8 10:40:49

编译后大概多大。。？？

liaopinjia 发表于 2013-1-10 11:26:31

32位更容易破解吧，弄个128位的IDEA呗，最近在研究这个~

boboo 发表于 2013-1-11 19:53:52

mark DES 32bit

limaotaizi 发表于 2013-9-18 23:08:20

好复杂~~~~~~~~~~~

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DES数据加密32位简化版