void *memcpy( void *dest, const void *src, unsigned char count )
{
// ASSERT((dest != NULL)&&(src != NULL));
unsigned char *temp_dest = (unsigned char *)dest;
unsigned char *temp_src = (unsigned char *)src;
while(count--) // 不对是否存在重叠区域进行判断
{
*temp_dest++ = *temp_src++;
}
return dest;
}
unsigned char *memset(unsigned char *dst,unsigned char value,unsigned char count)
{
unsigned char *start = dst;
while (count--)
*dst++ = value;
return(start);
}
// 初始置换表IP
unsigned char IP_Table[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};
//逆初始置换表IP^-1
unsigned char IP_1_Table[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};
//扩充置换表E
unsigned char E_Table[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};
//置换函数P
unsigned char P_Table[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};
//S盒
unsigned char S[8][4][16] =// 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}},
//S5
{{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}},
//S6
{{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}},
// S7
{{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}},
//S8
{{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}}};
//置换选择1
unsigned char PC_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};
//置换选择2
unsigned char PC_2[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,
50,44,32,46,43,48,38,55,
33,52,45,41,49,35,28,31};
// 对左移次数的规定
unsigned char MOVE_TIMES[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
//字节转换成二进制
unsigned char ByteToBit(unsigned char ch, unsigned char bit[8])
{
unsigned char cnt;
for(cnt = 0;cnt < 8; cnt++)
{
*(bit+cnt) = (ch>>cnt)&1;
}
return 0;
}
// 二进制转换成字节
unsigned char BitToByte(unsigned char bit[8],unsigned char *ch)
{
unsigned char 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
unsigned char Char8ToBit64(unsigned char ch[8],unsigned char bit[64])
{
unsigned char cnt;
for(cnt = 0; cnt < 8; 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
unsigned char Bit64ToChar8(unsigned char bit[64],unsigned char ch[8])
{
unsigned char cnt;
memset(ch,0,8);
for(cnt = 0; cnt < 8; cnt++)
{
BitToByte(bit+(cnt<<3),ch+cnt);
}
return 0;
}
// 密钥置换1
unsigned char DES_PC1_Transform(unsigned char key[64], unsigned char tempbts[56])
{
unsigned char cnt;
for(cnt = 0; cnt < 56; cnt++)
{
tempbts[cnt] = key[PC_1[cnt]];
}
return 0;
}
//密钥置换2
unsigned char DES_PC2_Transform(unsigned char key[56], unsigned char tempbts[48])
{
unsigned char cnt;
for(cnt = 0; cnt < 48; cnt++)
{
tempbts[cnt] = key[PC_2[cnt]];
}
return 0;
}
//循环左移
unsigned char DES_ROL(unsigned char data[56], unsigned char time)
{
unsigned char temp[56];
//保存将要循环移动到右边的位
memcpy(temp,data,time);
memcpy(temp+time,data+28,time);
//前28位移动
memcpy(data,data+time,28-time);
memcpy(data+28-time,temp,time);
//后28位移动
memcpy(data+28,data+28+time,28-time);
memcpy(data+56-time,temp+time,time);
return 0;
}
//IP置换
unsigned char DES_IP_Transform(unsigned char data[64])
{
unsigned char cnt;
unsigned char temp[64];
for(cnt = 0; cnt < 64; cnt++)
{
temp[cnt] = data[IP_Table[cnt]];
}
memcpy(data,temp,64);
return 0;
}
// IP逆置换
unsigned char DES_IP_1_Transform(unsigned char data[64])
{
unsigned char cnt;
unsigned char temp[64];
for(cnt = 0; cnt < 64; cnt++)
{
temp[cnt] = data[IP_1_Table[cnt]];
}
memcpy(data,temp,64);
return 0;
}
//扩展置换
unsigned char DES_E_Transform(unsigned char data[48])
{
unsigned char cnt;
unsigned char temp[48];
for(cnt = 0; cnt < 48; cnt++)
{
temp[cnt] = data[E_Table[cnt]];
}
memcpy(data,temp,48);
return 0;
}
//P置换
unsigned char DES_P_Transform(unsigned char data[32])
{
unsigned char cnt;
unsigned char temp[32];
for(cnt = 0; cnt < 32; cnt++)
{
temp[cnt] = data[P_Table[cnt]];
}
memcpy(data,temp,32);
return 0;
}
// 异或
unsigned char DES_XOR(unsigned char R[48], unsigned char L[48] ,unsigned char count)
{
unsigned char cnt;
for(cnt = 0; cnt < count; cnt++)
{
R[cnt] ^= L[cnt];
}
return 0;
}
// S盒置换
unsigned char DES_SBOX(unsigned char data[48])
{
unsigned char cnt;
unsigned char line,row,output;
unsigned char cur1,cur2;
for(cnt = 0; cnt < 8; cnt++)
{
cur1 = cnt*6;
cur2 = cnt<<2;
// 计算在S盒中的行与列
line = (data[cur1]<<1) + data[cur1+5];
row = (data[cur1+1]<<3) + (data[cur1+2]<<2)
+ (data[cur1+3]<<1) + data[cur1+4];
output = S[cnt][line][row];
// 化为2进制
data[cur2] = (output&0X08)>>3;
data[cur2+1] = (output&0X04)>>2;
data[cur2+2] = (output&0X02)>>1;
data[cur2+3] = output&0x01;
}
return 0;
}
//交换
unsigned char DES_Swap(unsigned char left[32], unsigned char right[32])
{
unsigned char temp[32];
memcpy(temp,left,32);
memcpy(left,right,32);
memcpy(right,temp,32);
return 0;
}
//生成子密钥
unsigned char DES_MakeSubKeys(unsigned char key[64],unsigned char subKeys[16][48])
{
unsigned char temp[56];
unsigned char cnt;
DES_PC1_Transform(key,temp);// PC1置换
for(cnt = 0; cnt < 16; cnt++) //16轮跌代,产生16个子密钥
{
DES_ROL(temp,MOVE_TIMES[cnt]);// 循环左移
DES_PC2_Transform(temp,subKeys[cnt]);//PC2置换,产生子密钥
}
return 0;
}
//加密单个分组
unsigned char DES_EncryptBlock(unsigned char plainBlock[8], unsigned char subKeys[16][48], unsigned char cipherBlock[8])
{
unsigned char plainBits[64];
unsigned char copyRight[48];
unsigned char cnt;
Char8ToBit64(plainBlock,plainBits);
//初始置换(IP置换)
DES_IP_Transform(plainBits);
// 16轮迭代
for(cnt = 0; cnt < 16; cnt++)
{
memcpy(copyRight,plainBits+32,32);
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[cnt],48); // 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,32); //将明文左半部分与右半部分进行异或
if(cnt != 15)
{
DES_Swap(plainBits,plainBits+32);//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
unsigned char DES_DecryptBlock(unsigned char cipherBlock[8], unsigned char subKeys[16][48],unsigned char plainBlock[8])
{
unsigned char cipherBits[64];
unsigned char copyRight[48];
short cnt;
Char8ToBit64(cipherBlock,cipherBits);
//初始置换(IP置换)
DES_IP_Transform(cipherBits);
// 16轮迭代
for(cnt = 15; cnt >= 0; cnt--)
{
memcpy(copyRight,cipherBits+32,32);
//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[cnt],48);
//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,32);
if(cnt != 0)
{
// 最终完成左右部的交换
DES_Swap(cipherBits,cipherBits+32);
}
}
// 逆初始置换(IP^1置换)
DES_IP_1_Transform(cipherBits);
Bit64ToChar8(cipherBits,plainBlock);
return 0;
}
//加密文件
unsigned char DES_Encrypt(unsigned char *keyStr,unsigned char *plainFile,unsigned char *cipherFile)
{
unsigned char keyBlock[8],bKey[64],subKeys[16][48];
memcpy(keyBlock,keyStr,8); //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 1;
}
//解密文件
unsigned char DES_Decrypt(unsigned char *keyStr,unsigned char *cipherFile,unsigned char *plainFile)
{
// unsigned char plainBlock[8],cipherBlock[8],
unsigned char bKey[64],keyBlock[8],subKeys[16][48];
memcpy(keyBlock,keyStr,8); //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 1;
}
/***********************************************************************************************
* 作 者:win2kddk
* 说 明:3重DES是使用16字节密钥将8字节明文数据块进行3次DES加密和解密。
***********************************************************************************************/
unsigned char DES_key[16];
void DEC3_Encrypt(unsigned char *in_buf, unsigned char *miwen)
{
unsigned char buf1[8],buf2[8];
DES_Encrypt(&DES_key[0],in_buf,buf1);
DES_Decrypt(&DES_key[8],buf1,buf2);
DES_Encrypt(&DES_key[0],buf2,miwen);
}
void DEC3_Decrypt(unsigned char *miwen, unsigned char *out_buf)
{
unsigned char buf1[8],buf2[8];
DES_Decrypt(&DES_key[0],miwen,buf1);
DES_Encrypt(&DES_key[8],buf1,buf2);
DES_Decrypt(&DES_key[0],buf2,out_buf);
}
void DES3_Test(void)
{
unsigned char in_buf[8] = "ABCDEFGH";
unsigned char miwen[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
unsigned char out_buf[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
memcpy(DES_key,"0123456789abcdef",16);//3DES的密钥是128位的,这里只是设置密钥的DEMO。
DEC3_Encrypt(in_buf,miwen); //3DES加密
DEC3_Decrypt(miwen,out_buf); //3DES解密
}
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