📄 yxydes.cpp
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/*----------------------------------------------------------------
// Copyright (C) 2007 尹学渊
// 版权所有。
//
// 文件名：yxyDES.cpp
// 文件功能描述：DES加密类 cpp文件
//
//
// 创建人：尹学渊
//
// 修改人：
// 修改描述：修正加密及解密左右顺序，修正待加密字符不足8位时填充字符问题，修正密钥不 // 足7位时数组越界问题
//
// 修改人：
// 修改描述：
//----------------------------------------------------------------*/
//#include "stdafx.h"
#include "yxyDES.h"
// permuted choice table (PC1)
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
};
// permuted choice key (PC2)
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
};
// number left rotations of pc1
const static int Shift_Table[16] = {
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};
// initial permutation (IP)
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
};
// expansion operation matrix (E)
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
};
// The (in)famous S-boxes
const static int 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
};
// 32-bit permutation function P used on the output of the S-boxes
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
};
// final permutation IP^-1
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
};
yxyDES::yxyDES()
{}
yxyDES::~yxyDES()
{}
void yxyDES::InitializeKey(string s)
{
//convert 8 char-bytes key to 64 binary-bits
char sz_64key[64] = {0};
int iTmpBit[64] = {0};
for(int i=0;i<64;i++)
{
int it = i>>3;
if(it < s.length())
iTmpBit[i] = (s[it]>>(i&7)) & 1;
else
iTmpBit[i] = 0;
//a = 0x61 = 0110,0001
//after this , a is 1000,0110
}
//let me convert it to right
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)]);
//PC 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);
}
string yxyDES::HexCharToBinary(char ch)
{
switch(ch)
{
case '0':
return "0000";
case '1':
return "0001";
case '2':
return "0010";
case '3':
return "0011";
case '4':
return "0100";
case '5':
return "0101";
case '6':
return "0110";
case '7':
return "0111";
case '8':
return "1000";
case '9':
return "1001";
case 'a':
return "1010";
case 'b':
return "1011";
case 'c':
return "1100";
case 'd':
return "1101";
case 'e':
return "1110";
case 'f':
return "1111";
default:
return "";
}
}
string yxyDES::HexIntToBinary(int i)
{
switch(i)
{
case 0:
return "0000";
case 1:
return "0001";
case 2:
return "0010";
case 3:
return "0011";
case 4:
return "0100";
case 5:
return "0101";
case 6:
return "0110";
case 7:
return "0111";
case 8:
return "1000";
case 9:
return "1001";
case 10:
return "1010";
case 11:
return "1011";
case 12:
return "1100";
case 13:
return "1101";
case 14:
return "1110";
case 15:
return "1111";
default:
return "";
}
}
string yxyDES::BinaryToString(char* szSource,int len,bool bType)
{
//bType == true is Binary to Hex
//else is Binary to Char
int ilen;
if(len % 8 != 0)
return "";
else
ilen = len / 8;
string s_return = "";
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]) * 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;
}
s_return += buffer[0];
s_return += buffer[1];
buffer[0] = '\0';
buffer[1] = '\0';
}
else
{
char ch = (char)iCh;
s_return += ch;
}
}
return s_return;
}
void yxyDES::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++)
{
//shift to left
//Left 28 bits
memcpy(szCi,szTmpL + Shift_Table[i],28 - Shift_Table[i]);
memcpy(szCi + 28 - Shift_Table[i],szTmpL,Shift_Table[i]);
//Right 28 bits
memcpy(szDi,szTmpR + Shift_Table[i],28 - Shift_Table[i]);
memcpy(szDi + 28 - Shift_Table[i],szTmpR,Shift_Table[i]);
//permuted choice 48 bits key
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];
}
//Evaluate new szTmpL and szTmpR
memcpy(szTmpL,szCi,28);
memcpy(szTmpR,szDi,28);
}
}
void yxyDES::EncryptData(string s)
{
char sz_IP[64] = {0};
char sz_Li[32] = {0};
char sz_Ri[32] = {0};
char sz_Final64[64] = {0};
char szCiphertextBinary[64] = {0};
//IP
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);
}
//so D=LR
memcpy(sz_Final64,sz_Ri,32);//原版为memcpy(sz_Final64,sz_Li,32)
memcpy(sz_Final64 + 32,sz_Li,32);//原版为memcpy(sz_Final64 + 32,sz_Ri,32)
//~IP
for(int j=0;j<64;j++)
{
szCiphertextBinary[j] = sz_Final64[IPR_Table[j]-1];
}
memcpy(szCiphertext,BinaryToString(szCiphertextBinary,64,true).c_str(),16);
}
void yxyDES::DecryptData(string s)
{
char sz_IP[64] = {0};
char sz_Li[32] = {0};
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