Question

我想要DES加密解密的源代码

Answer 1

#include <cmath>
#include <stdio.h>
#include <windows.h>
#include <time.h>

const static 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
};
const static 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
};
const static int Shift_Table[16] = {
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};
const static 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
};
static const int E_Table[48] = {
32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9,
8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 16, 17,
16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25,
24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 1
};
const static int S_Box[8][4][16] = {
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
};
const static char 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
};
const static char 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
};

char SubKeys[16][48];
char szCiphertext[17];
char szPlaintext[9];
char szFCiphertextAnyLength[8192];
char szFPlaintextAnyLength[4096];

char SingleBinaryToChar(int i)
{
if(i == 1)
return '1';
else
return '0';
}

void CreateSubKey(char* sz)
{
char szTmpL[28] = {0};
char szTmpR[28] = {0};
char szCi[28] = {0};
char szDi[28] = {0};
memcpy(szTmpL,sz,28);
memcpy(szTmpR,sz+28,28);

for(int i=0;i<16;i++)
{
memcpy(szCi,szTmpL + Shift_Table[i],28 - Shift_Table[i]);
memcpy(szCi + 28 - Shift_Table[i],szTmpL,Shift_Table[i]);
memcpy(szDi,szTmpR + Shift_Table[i],28 - Shift_Table[i]);
memcpy(szDi + 28 - Shift_Table[i],szTmpR,Shift_Table[i]);

char szTmp56[56] = {0};
memcpy(szTmp56,szCi,28);
memcpy(szTmp56 + 28,szDi,28);
for(int j=0;j<48;j++)
{
SubKeys[i][j] = szTmp56[PC2_Table[j]-1];
}
memcpy(szTmpL,szCi,28);
memcpy(szTmpR,szDi,28);
}
}

int SingleCharToBinary(char ch)
{
if(ch == '1')
return 1;
else
return 0;
}

void HexCharToBinary(char ch,char *strBin)
{
strBin[0]=0;
switch(ch)
{
case '0':
strcpy(strBin,"0000");
break;
case '1':
strcpy(strBin,"0001");
break;
case '2':
strcpy(strBin,"0010");
break;
case '3':
strcpy(strBin,"0011");
break;
case '4':
strcpy(strBin,"0100");
break;
case '5':
strcpy(strBin,"0101");
break;
case '6':
strcpy(strBin,"0110");
break;
case '7':
strcpy(strBin,"0111");
break;
case '8':
strcpy(strBin,"1000");
break;
case '9':
strcpy(strBin,"1001");
break;
case 'a':
strcpy(strBin,"1010");
break;
case 'b':
strcpy(strBin,"1011");
break;
case 'c':
strcpy(strBin,"1100");
break;
case 'd':
strcpy(strBin,"1101");
break;
case 'e':
strcpy(strBin,"1110");
break;
case 'f':
strcpy(strBin,"1111");
break;
}
}

void HexIntToBinary(int i,char *strBin)
{
switch(i)
{
case 0:
strcpy(strBin,"0000");
break;
case 1:
strcpy(strBin,"0001");
break;
case 2:
strcpy(strBin,"0010");
break;
case 3:
strcpy(strBin,"0011");
break;
case 4:
strcpy(strBin,"0100");
break;
case 5:
strcpy(strBin,"0101");
break;
case 6:
strcpy(strBin,"0110");
break;
case 7:
strcpy(strBin,"0111");
break;
case 8:
strcpy(strBin,"1000");
break;
case 9:
strcpy(strBin,"1001");
break;
case 10:
strcpy(strBin,"1010");
break;
case 11:
strcpy(strBin,"1011");
break;
case 12:
strcpy(strBin,"1100");
break;
case 13:
strcpy(strBin,"1101");
break;
case 14:
strcpy(strBin,"1110");
break;
case 15:
strcpy(strBin,"1111");
break;
}
}
void BinaryToString(char* szSource,int len,bool bType,char *strString)
{
strString[0]=0;

int ilen;
if(len % 8 != 0)
return;
else
ilen = len / 8;

for(int i=0;i<ilen;i++)
{
char szTmp8[8] = {0};
int iCh = 0;
memcpy(szTmp8,szSource+8*i,8);
for(int j=0;j<8;j++)
{
iCh+=SingleCharToBinary(szTmp8[j]) * (int)pow(2.0,7-j);
}
if(bType)
{
char buffer[16] = {0};
itoa(iCh,buffer,16);
//if the integer less than 16,insert a zero to buffer
if(iCh < 16)
{
char cTmp = buffer[0];
buffer[0] = '0';
buffer[1] = cTmp;
}
strcat(strString,buffer);
buffer[0] = '\0';
buffer[1] = '\0';
}
else
{
char ch[2];
ch[0] = (char)iCh;
ch[1]=0;
strcat(strString,ch);
}
}

}

void InitialPermuteData(char *s,char* Return_value,bool bType)
{
if(bType)
{
char sz_64data[64] = {0};
int iTmpBit[64] = {0};
for(int i=0;i<64;i++)
{
iTmpBit[i] = (s[i>>3]>>(i&7)) & 1;
}
for(int j=0;j<8;j++)
for(int k=0;k<8;k++)
sz_64data[8*j+k] = SingleBinaryToChar(iTmpBit[8*(j+1)-(k+1)]);
char sz_IPData[64] = {0};
for(int k=0;k<64;k++)
{
sz_IPData[k] = sz_64data[IP_Table[k]-1];
}
memcpy(Return_value,sz_IPData,64);
}
else
{
char sz_64data[128];
sz_64data[0]=0;
for(unsigned int ui=0;ui<strlen(s);ui++)
{
char strBin[128];
char ch = s[ui];
HexCharToBinary(tolower(ch),strBin);
strcat(sz_64data,strBin);
}
char sz_IPData[64] = {0};
for(int i=0;i<64;i++)
{
sz_IPData[i] = sz_64data[IP_Table[i]-1];
}
memcpy(Return_value,sz_IPData,64);
}

}

void ExpansionR(char* sz,char* Return_value)
{
char sz_48ER[48] = {0};
for(int i=0;i<48;i++)
{
sz_48ER[i] = sz[E_Table[i]-1];
}
memcpy(Return_value,sz_48ER,48);
}

void XOR(char* sz_P1,char* sz_P2,int len,char* Return_value)
{
char sz_Buffer[256] = {0};
for(int i=0;i<len;i++)
{
sz_Buffer[i] = SingleBinaryToChar(SingleCharToBinary(sz_P1[i]) ^ SingleCharToBinary(sz_P2[i]));
}
memcpy(Return_value,sz_Buffer,len);
}

void CompressFuncS(char* sz_48,char *str32)
{
char sTmp[8][6] = {0};
str32[0]=0;

for(int i=0;i<8;i++)
{
memcpy(sTmp[i],sz_48 + 6 * i,6);
int iX = SingleCharToBinary(sTmp[i][0]) * 2 + SingleCharToBinary(sTmp[i][5]);
int iY = 0;
for(int j=1;j<5;j++)
{
iY += SingleCharToBinary(sTmp[i][j]) * (int)pow(2.0,4-j);
}
char strBin[128];
HexIntToBinary(S_Box[i][iX][iY],strBin);
strcat(str32,strBin);
}
}

void PermutationP(char *s,char* Return_value)
{
char sz_32bits[32] = {0};
for(int i=0;i<32;i++)
{
sz_32bits[i] = s[P_Table[i]-1];
}
memcpy(Return_value,sz_32bits,32);
}

此处有一函数，贴不上来，后跟图吧

void FillToEightBits(char *sz,char *strBits)
{
char temp[8]={0};
for( int i = 0;i<(int)strlen(sz);i++)
{
temp[i] = sz[i];
}
strcpy(strBits,sz);
for( i = strlen(sz);i<8;i++)
{
strcat(sz,"0");
}
strcpy(strBits,sz);
}

void InitializeKey(char *s)
{
char sz_64key[64] = {0};
int iTmpBit[64] = {0};
for(int i=0;i<64;i++)
{
int it = i>>3;
if(it < (int)strlen(s))
iTmpBit[i] = (s[it]>>(i&7)) & 1;
else
iTmpBit[i] = 0;
}
for(int j=0;j<8;j++)
for(int k=0;k<8;k++)
sz_64key[8*j+k] = SingleBinaryToChar(iTmpBit[8*(j+1)-(k+1)]);
char sz_56key[56] = {0};
for(int k=0;k<56;k++)
{
sz_56key[k] = sz_64key[PC1_Table[k]-1];
}
CreateSubKey(sz_56key);
}

void EncryptData(char *s,bool outflag)
{
char sz_IP[64] = {0};
char sz_Li[32] = {0};
char sz_Ri[32] = {0};
char sz_Final64[64] = {0};
char szCiphertextBinary[64] = {0};

InitialPermuteData(s,sz_IP,true);
memcpy(sz_Li,sz_IP,32);
memcpy(sz_Ri,sz_IP + 32,32);

for(int i=0;i<16;i++)
{
FunctionF(sz_Li,sz_Ri,i);
}

memcpy(sz_Final64,sz_Ri,32);
memcpy(sz_Final64 + 32,sz_Li,32);

for(int j=0;j<64;j++)
{
szCiphertextBinary[j] = sz_Final64[IPR_Table[j]-1];
}
char strString[128];
memset(strString,0,sizeof(strString));
BinaryToString(szCiphertextBinary,64,outflag,strString);
memcpy(szCiphertext,strString,16);
}

void DecryptData(char *s,bool outflag)
{
char sz_IP[64] = {0};
char sz_Li[32] = {0};
char sz_Ri[32] = {0};
char sz_Final64[64] = {0};
char szPlaintextBinary[64] = {0};

InitialPermuteData(s,sz_IP,false);
memcpy(sz_Ri,sz_IP,32);
memcpy(sz_Li,sz_IP + 32,32);

for(int i=0;i<16;i++)
{
FunctionF(sz_Ri,sz_Li,15-i);
}
memcpy(sz_Final64,sz_Li,32);
memcpy(sz_Final64 + 32,sz_Ri,32);

for(int j=0;j<64;j++)
{
szPlaintextBinary[j] = sz_Final64[IPR_Table[j]-1];
}
char strString[128];
memset(strString,0,sizeof(strString));
BinaryToString(szPlaintextBinary,64,outflag,strString);
memcpy(szPlaintext,strString,16);

}

void SetCiphertext(char* value)
{
memcpy(szCiphertext,value,16);
}
char* GetCiphertext()
{
return szCiphertext;
}

void SetPlaintext(char* value)
{
memcpy(szPlaintext,value,8);
}
char* GetPlaintext()
{
return szPlaintext;
}
void EncryptAnyLength(char *szSource)
{
int iLength = strlen(szSource);
if(iLength == 8)
{
EncryptData(szSource,true);
memcpy(szFCiphertextAnyLength,szCiphertext,16);
szFCiphertextAnyLength[16] = '\0';
}
else if(iLength < 8)
{
char szSource2[128];
FillToEightBits(szSource,szSource2);
EncryptData(szSource2,true);
memcpy(szFCiphertextAnyLength,szCiphertext,16);
szFCiphertextAnyLength[16] = '\0';
}
else if(iLength > 8)
{
int iParts = (int)ceil(iLength/8.0);
int iResidue = iLength % 8;
char szLast8Bits[128];
char szLast8Bits2[128];
for(int i=0;i<iParts-1;i++)
{
char szTmp[128];
memcpy(szTmp,&szSource[i*8],8);
szTmp[8]=0;
EncryptData(szTmp,true);
memcpy(szFCiphertextAnyLength + 16*i,szCiphertext,16);
}
if(iResidue != 0)
{
memcpy(szLast8Bits,&szSource[(iParts-1)*8],iResidue);
szLast8Bits[iResidue]=0;
FillToEightBits(szLast8Bits,szLast8Bits2);
}
else
{
memcpy(szLast8Bits2,&szSource[(iParts-1)*8],8);
szLast8Bits2[8]=0;
}
EncryptData(szLast8Bits2,true);
memcpy(szFCiphertextAnyLength + 16*(iParts - 1),szCiphertext,16);
szFCiphertextAnyLength[(iParts)*16] = '\0';
}
}

char* GetCiphertextAnyLength()
{
return szFCiphertextAnyLength;
}

void DecryptAnyLength(char *szSource)
{
int iLength = strlen(szSource);
int iRealLengthOfPlaintext = 0;
if(iLength == 16)
{
DecryptData(szSource,false);
memcpy(szFPlaintextAnyLength,szPlaintext,8);
iRealLengthOfPlaintext = 8;
}
else if(iLength < 16)
{
sprintf(szFPlaintextAnyLength,"待解密字符长度必须为16的倍数！");
}
else if(iLength > 16)
{
int iParts = (int)ceil(iLength/16.0);
int iResidue = iLength % 16;
if(iResidue != 0)
{
sprintf(szFPlaintextAnyLength,"待解密字符长度必须为16的倍数！");
return;
}
iRealLengthOfPlaintext = iParts * 8;
for(int i=0;i<iParts;i++)
{
char szTmp[128];
memcpy(szTmp,&szSource[i*16],16);
szTmp[16]=0;
DecryptData(szTmp,true);
memcpy(szFPlaintextAnyLength + 8*i,szPlaintext,8);
}
}
}

char* GetPlaintextAnyLength()
{
return szFPlaintextAnyLength;
}

return 0;
}