📄 des.h
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//DES算法所使用的表
///////////////////////////////////////////////////////////////////
//IP置换表
const int IP_Table[64] = {
58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8,
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
};
//IP逆置换表
const int IPR_Table[64] = {
40, 8, 48, 16, 56, 24, 64, 32, 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
};
//S_Box表
const char S_Box[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
};
//P置换表
const int P_Table[32] = {
16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10,
2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25
};
//子密钥生产器的PC1置换表
const int PC1_Table[56] = {
57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18,
10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36,
63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4
};
//子密钥生产器的PC2置换表
const int PC2_Table[48] = {
14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10,
23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2,
41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48,
44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32
};
//循环左移变换表
const char LOOP_Table[16] = {
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};
//////////////////////////////////////////////////////////////////
//DES算法所使用的函数
//////////////////////////////////////////////////////////////////
//字节串转换为位串
void ByteToBit(char *Byte, bool *Bit, int len);
//位串转换为字节串
void BitToByte(bool *Bit, char *Byte, int len);
//置换函数
void Transmit(bool *In, bool *Out, const int *Table, int len);
//IP置换
void IP_Transmit(bool *Mes, bool *Cry);
//E-运算
void E_function(bool *Mes, bool *Cry);
//S-盒运算
void S_function(bool *Mes, bool *Cry);
//P置换
void P_Transmit(bool *Mes, bool *Cry);
//左右交换变换
void Swap(bool *LMes, bool *RMes);
//IP逆置换
void IPR_Transmit(bool *Mes, bool *Cry);
//中间函数f
void Function(bool *Mes, bool *Cry, bool *K);
//PC1置换函数
void PC1_Transmit(bool *Key, bool *CDkey);
//PC2置换函数
void PC2_Transmit(bool *CDkey, bool *SubKey);
//循环左移变换函数LS
void LOOP_LS(bool *CDkey, int Turn);
//子密钥生成器
void CreateSubKey(bool *Key, bool **SubKey);
//DES加密函数
void DES_Encryption(bool *Mes, bool *Key, bool *Cry);
//DES解密函数
void DES_Decryption(bool *Cry, bool *Key, bool *Mes);
//////////////////////////////////////////////////////
//DES的基本运算所需的函数
void ByteToBit(char *Byte, bool *Bit, int len)
{
for(int i = 0; i < len; i++)
Bit[i] = (Byte[i/8]>>(7-i%8))&1;
}
void BitToByte(bool *Bit, char *Byte, int len)
{
for(int i = 0; i < 8; i++)
{
Byte[i] = 0;
for(int j = 0; j < 8; j++)
Byte[i] = (Byte[i]<<1)|char(Bit[j+i*8]);
}
}
void Transmit(bool *In, bool *Out, const int *Table, int len)
{
for(int i = 0; i < len; i++)
Out[i] = In[Table[i] - 1];
}
void IP_Transmit(bool *Mes, bool *Cry)
{
Transmit(Mes, Cry, IP_Table, 64);
}
void E_function(bool *Mes, bool *Cry)
{
for(int i = 0; i < 48; i++)
Cry[i] = Mes[(32+i-2*(i/6)-1)%32];
}
void S_function(bool *Mes, bool *Cry)
{
int r, l;
int c;
for(int i=0, s=0, j=0; s<8; i+=6, s++, j+=4)
{
r = Mes[i]*2 + Mes[i+5];
l = Mes[i+1]*8 + Mes[i+2]*4 + Mes[i+3]*2 + Mes[i+4];
c = S_Box[s][r][l];
Cry[j] = ((c&8)>>3 ? 1:0);
Cry[j+1] = ((c&4)>>2 ? 1:0);
Cry[j+2] = ((c&2)>>1 ? 1:0);
Cry[j+3] = ((c&1) ? 1:0);
}
}
void P_Transmit(bool *Mes, bool *Cry)
{
Transmit(Mes, Cry, P_Table, 32);
}
void Swap(bool *LMes, bool *RMes)
{
bool *Ptemp = new bool[32];
for(int i = 0; i < 32; i++)
Ptemp[i] = LMes[i];
for(i = 0; i < 32; i++)
LMes[i] = RMes[i];
for(i = 0; i < 32; i++)
RMes[i] = Ptemp[i];
}
void IPR_Transmit(bool *Mes, bool *Cry)
{
Transmit(Mes, Cry, IPR_Table, 64);
}
void Function(bool *Mes, bool *Cry, bool *K)
{
bool *EBits = new bool[48];
bool *SBits = new bool[32];
E_function(Mes, EBits);
for(int i = 0; i < 48; i++)
EBits[i] = EBits[i] ^ K[i];
S_function(EBits,SBits);
P_Transmit(SBits, Cry);
}
///////////////////////////////////////////////////
//子密钥生成器所用函数
void PC1_Transmit(bool *Key, bool *CDkey)
{
Transmit(Key, CDkey, PC1_Table, 56);
}
void PC2_Transmit(bool *CDkey, bool *SubKey)
{
Transmit(CDkey, SubKey, PC2_Table, 48);
}
void LOOP_LS(bool *CDkey, int Turn)
{
for(int t = 0; t < LOOP_Table[Turn]; t++)
{
bool bit = CDkey[0];
for(int i =0; i < 27; i++)
CDkey[i] = CDkey[i+1];
CDkey[27] = bit;
}
}
void CreateSubKey(bool *Key, bool **SubKey)
{
bool *CDKey = new bool[56];
bool *CKey = new bool[28];
bool *DKey = new bool[28];
PC1_Transmit(Key, CDKey);
for(int i = 0; i < 28; i++)
{
CKey[i] = CDKey[i];
DKey[i] = CDKey[i+28];
}
for(int turn = 0; turn < 16; turn++)
{
LOOP_LS(CKey, turn);
LOOP_LS(DKey, turn);
for(int i = 0; i < 56; i++)
if(i < 28)
CDKey[i] = CKey[i];
else
CDKey[i] = DKey[i-28];
PC2_Transmit(CDKey, SubKey[turn]);
}
}
/////////////////////////////////////////////////////
//加密函数
void DES_Encryption(bool *Mes, bool *Key, bool *Cry)
{
bool *LRCry = new bool[64];
bool *LCry = new bool[32];
bool *RCry = new bool[32];
bool *FCry = new bool[32];
bool **SubKey = new bool*[16];
for(int p = 0; p < 16; p++)
SubKey[p] = new bool[48];
CreateSubKey(Key, SubKey);
IP_Transmit(Mes, LRCry);
for(int i = 0; i < 32; i++)
{
LCry[i] = LRCry[i];
RCry[i] = LRCry[i+32];
}
for(int turn = 0; turn < 16; turn++)
{
Function(RCry, FCry, SubKey[turn]);
for(i = 0; i < 32; i++)
LCry[i] = LCry[i] ^ FCry[i];
Swap(LCry, RCry);
}
for(i = 0; i < 64; i++)
if(i < 32)
LRCry[i] = RCry[i];
else
LRCry[i] = LCry[i-32];
IPR_Transmit(LRCry, Cry);
}
//解密函数
void DES_Decryption(bool *Cry, bool *Key, bool *Mes)
{
bool *LRMes = new bool[64];
bool *LMes = new bool[32];
bool *RMes = new bool[32];
bool *FMes = new bool[32];
bool **SubKey = new bool*[16];
for(int p = 0; p < 16; p++)
SubKey[p] = new bool[48];
CreateSubKey(Key, SubKey);
IP_Transmit(Cry, LRMes);
for(int i = 0; i < 32; i++)
{
LMes[i] = LRMes[i];
RMes[i] = LRMes[i+32];
}
for(int turn = 0; turn < 16; turn++)
{
Function(RMes, FMes, SubKey[15-turn]);
for(i = 0; i < 32; i++)
LMes[i] = LMes[i] ^ FMes[i];
Swap(LMes, RMes);
}
for(i = 0; i < 64; i++)
if(i < 32)
LRMes[i] = RMes[i];
else
LRMes[i] = LMes[i-32];
IPR_Transmit(LRMes, Mes);
}
/////////////////////////////////////////////////////
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