📄 yxydes2.cpp
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/*----------------------------------------------------------------
// Copyright (C) 2008 尹学渊
// 版权所有。
//
// 文件名：yxyDES2.cpp
// 文件功能描述：DES2加密类 cpp文件
//
//
// 创建人：尹学渊
//
// 修改人：
// 修改描述：
//
// 修改人：
// 修改描述：
//----------------------------------------------------------------*/
//#include "stdafx.h"
#include "yxyDES2.h"
// permuted choice table (PC1)
const static char 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 char 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 char Shift_Table[16] = {
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};
// initial permutation (IP)
const static char 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)
const static char 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 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
};
// 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
};
yxyDES2::yxyDES2()
{
memset(szCiphertextRaw,0,64);
memset(szPlaintextRaw,0,64);
memset(szCiphertextInBytes,0,8);
memset(szPlaintextInBytes,0,8);
memset(szCiphertextInBinary,0,65);
memset(szCiphertextInHex,0,17);
memset(szPlaintext,0,9);
memset(szFCiphertextAnyLength,0,8192);
memset(szCiphertextInHex,0,8192);
}
yxyDES2::~yxyDES2()
{
}
void yxyDES2::InitializeKey(char* srcBytes,unsigned int keyN)
{
//convert 8 char-bytes key to 64 binary-bits
char sz_64key[64] = {0};
Bytes2Bits(srcBytes,sz_64key,64);
//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,keyN);
}
void yxyDES2::CreateSubKey(char* sz_56key,unsigned int keyN)
{
char szTmpL[28] = {0};
char szTmpR[28] = {0};
char szCi[28] = {0};
char szDi[28] = {0};
memcpy(szTmpL,sz_56key,28);
memcpy(szTmpR,sz_56key + 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++)
{
szSubKeys[keyN][i][j] = szTmp56[PC2_Table[j]-1];
}
//Evaluate new szTmpL and szTmpR
memcpy(szTmpL,szCi,28);
memcpy(szTmpR,szDi,28);
}
}
void yxyDES2::EncryptData(char* _srcBytes,unsigned int keyN)
{
char szSrcBits[64] = {0};
char sz_IP[64] = {0};
char sz_Li[32] = {0};
char sz_Ri[32] = {0};
char sz_Final64[64] = {0};
Bytes2Bits(_srcBytes,szSrcBits,64);
//IP
InitialPermuteData(szSrcBits,sz_IP);
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,keyN);
}
//so D=LR
memcpy(sz_Final64,sz_Ri,32);
memcpy(sz_Final64 + 32,sz_Li,32);
//~IP
for(int j=0;j<64;j++)
{
szCiphertextRaw[j] = sz_Final64[IPR_Table[j]-1];
}
Bits2Bytes(szCiphertextInBytes,szCiphertextRaw,64);
}
void yxyDES2::DecryptData(char* _srcBytes,unsigned int keyN)
{
char szSrcBits[64] = {0};
char sz_IP[64] = {0};
char sz_Li[32] = {0};
char sz_Ri[32] = {0};
char sz_Final64[64] = {0};
Bytes2Bits(_srcBytes,szSrcBits,64);
//IP --- return is sz_IP
InitialPermuteData(szSrcBits,sz_IP);
//divide the 64 bits data to two parts
memcpy(sz_Ri,sz_IP,32); //exchange L to R
memcpy(sz_Li,sz_IP + 32,32); //exchange R to L
//16 rounds F and xor and exchange
for(int i=0;i<16;i++)
{
FunctionF(sz_Ri,sz_Li,15-i,keyN);
}
memcpy(sz_Final64,sz_Li,32);
memcpy(sz_Final64 + 32,sz_Ri,32);
// ~IP
for(int j=0;j<64;j++)
{
szPlaintextRaw[j] = sz_Final64[IPR_Table[j]-1];
}
Bits2Bytes(szPlaintextInBytes,szPlaintextRaw,64);
}
void yxyDES2::FunctionF(char* sz_Li,char* sz_Ri,unsigned int iKey,unsigned int keyN)
{
char sz_48R[48] = {0};
char sz_xor48[48] = {0};
char sz_P32[32] = {0};
char sz_Rii[32] = {0};
char sz_Key[48] = {0};
char s_Compress32[32] = {0};
memcpy(sz_Key,szSubKeys[keyN][iKey],48);
ExpansionR(sz_Ri,sz_48R);
XOR(sz_48R,sz_Key,48,sz_xor48);
CompressFuncS(sz_xor48,s_Compress32);
PermutationP(s_Compress32,sz_P32);
XOR(sz_P32,sz_Li,32,sz_Rii);
memcpy(sz_Li,sz_Ri,32);
memcpy(sz_Ri,sz_Rii,32);
}
void yxyDES2::InitialPermuteData(char* _src,char* _dst)
{
//IP
for(int i=0;i<64;i++)
{
_dst[i] = _src[IP_Table[i]-1];
}
}
void yxyDES2::ExpansionR(char* _src,char* _dst)
{
for(int i=0;i<48;i++)
{
_dst[i] = _src[E_Table[i]-1];
}
}
void yxyDES2::XOR(char* szParam1,char* szParam2, unsigned int uiParamLength, char* szReturnValueBuffer)
{
for(unsigned int i=0; i<uiParamLength; i++)
{
szReturnValueBuffer[i] = szParam1[i] ^ szParam2[i];
}
}
void yxyDES2::CompressFuncS(char* _src48, char* _dst32)
{
char bTemp[8][6]={0};
char dstBits[4]={0};
for(int i=0;i<8;i++)
{
memcpy(bTemp[i],_src48+i*6,6);
int iX = (bTemp[i][0])*2 + (bTemp[i][5]);
int iY = 0;
for(int j=1;j<5;j++)
{
iY += bTemp[i][j]<<(4-j);
}
Int2Bits(S_Box[i][iX][iY], dstBits);
memcpy(_dst32 + i * 4, dstBits, 4);
}
}
void yxyDES2::PermutationP(char* _src,char* _dst)
{
for(int i=0;i<32;i++)
{
_dst[i] = _src[P_Table[i]-1];
}
}
void yxyDES2::Bytes2Bits(char *srcBytes, char* dstBits, unsigned int sizeBits)
{
for(unsigned int i=0; i < sizeBits; i++)
dstBits[i] = ((srcBytes[i>>3]<<(i&7)) & 128)>>7;
}
void yxyDES2::Bits2Bytes(char *dstBytes, char* srcBits, unsigned int sizeBits)
{
memset(dstBytes,0,sizeBits>>3);
for(unsigned int i=0; i < sizeBits; i++)
dstBytes[i>>3] |= (srcBits[i] << (7 - (i & 7)));
}
void yxyDES2::Int2Bits(unsigned int _src, char* dstBits)
{
for(unsigned int i=0; i < 4; i++)
dstBits[i] = ((_src<<i) & 8)>>3;
}
void yxyDES2::Bits2Hex(char *dstHex, char* srcBits, unsigned int sizeBits)
{
memset(dstHex,0,sizeBits>>2);
for(unsigned int i=0; i < sizeBits; i++) //convert to int 0-15
dstHex[i>>2] += (srcBits[i] << (3 - (i & 3)));
for(unsigned int j=0;j < (sizeBits>>2);j++)
dstHex[j] += dstHex[j] > 9 ? 55 : 48; //convert to char '0'-'F'
}
void yxyDES2::Hex2Bits(char *srcHex, char* dstBits, unsigned int sizeBits)
{
memset(dstBits,0,sizeBits);
for(unsigned int i=0;i < (sizeBits>>2);i++)
srcHex[i] -= srcHex[i] > 64 ? 55 : 48; //convert to char int 0-15
for(unsigned int j=0; j < sizeBits; j++)
dstBits[j] = ((srcHex[j>>2]<<(j&3)) & 15) >> 3;
}
char* yxyDES2::GetCiphertextInBinary()
{
for(unsigned int i=0;i<64;i++)
{
szCiphertextInBinary[i] = szCiphertextRaw[i] + 48; // from int(0) to char('0') and int1 to char('1')
}
szCiphertextInBinary[64] = '\0';
return szCiphertextInBinary;
}
char* yxyDES2::GetCiphertextInHex()
{
Bits2Hex(szCiphertextInHex,szCiphertextRaw,64);
szCiphertextInHex[16] = '\0';
return szCiphertextInHex;
}
char* yxyDES2::GetCiphertextInBytes()
{
return szCiphertextInBytes;
}
char* yxyDES2::GetPlaintext()
{
memcpy(szPlaintext,szPlaintextInBytes,8);
szPlaintext[8] = '\0';
return szPlaintext;
}
char* yxyDES2::GetCiphertextAnyLength()
{
return szFCiphertextAnyLength;
}
char* yxyDES2::GetPlaintextAnyLength()
{
return szFPlaintextAnyLength;
}
void yxyDES2::EncryptAnyLength(char* _srcBytes,unsigned int _bytesLength,unsigned int keyN)
{
if(_bytesLength == 8)
{
EncryptData(_srcBytes,keyN);
memcpy(szFCiphertextAnyLength,szCiphertextInBytes,8);
szFCiphertextAnyLength[8] = '\0';
}
else if(_bytesLength < 8)
{
char _temp8bytes[8] = {0};
memcpy(_temp8bytes,_srcBytes,_bytesLength);
EncryptData(_temp8bytes,keyN);
memcpy(szFCiphertextAnyLength,szCiphertextInBytes,8);
szFCiphertextAnyLength[8] = '\0';
}
else if(_bytesLength > 8)
{
int iParts = _bytesLength>>3;
int iResidue = _bytesLength % 8;
char szLast8Bits[8] = {0};
for(int i=0;i<iParts;i++)
{
memcpy(szLast8Bits,_srcBytes + (i<<3),8);
EncryptData(szLast8Bits,keyN);
memcpy(szFCiphertextAnyLength + (i<<3),szCiphertextInBytes,8);
}
memset(szLast8Bits,0,8);
memcpy(szLast8Bits,_srcBytes + (iParts<<3),iResidue);
EncryptData(szLast8Bits,keyN);
memcpy(szFCiphertextAnyLength + (iParts<<3),szCiphertextInBytes,8);
szFCiphertextAnyLength[((iParts+1)<<3)] = '\0';
}
}
void yxyDES2::DecryptAnyLength(char* _srcBytes,unsigned int _bytesLength, unsigned int keyN)
{
if(_bytesLength == 8)
{
DecryptData(_srcBytes,keyN);
memcpy(szFPlaintextAnyLength,szPlaintextInBytes,8);
szFPlaintextAnyLength[8] = '\0';
}
else if(_bytesLength < 8)
{
char _temp8bytes[8] = {0};
memcpy(_temp8bytes,_srcBytes,8);
DecryptData(_temp8bytes,keyN);
memcpy(szFPlaintextAnyLength,szPlaintextInBytes,_bytesLength);
szFPlaintextAnyLength[_bytesLength] = '\0';
}
else if(_bytesLength > 8)
{
int iParts = _bytesLength>>3;
int iResidue = _bytesLength % 8;
char szLast8Bits[8] = {0};
for(int i=0;i<iParts;i++)
{
memcpy(szLast8Bits,_srcBytes + (i<<3),8);
DecryptData(szLast8Bits,keyN);
memcpy(szFPlaintextAnyLength + (i<<3),szPlaintextInBytes,8);
}
if(iResidue != 0)
{
memset(szLast8Bits,0,8);
memcpy(szLast8Bits,_srcBytes + (iParts<<3),8);
DecryptData(szLast8Bits,keyN);
memcpy(szFPlaintextAnyLength + (iParts<<3),szPlaintextInBytes,iResidue);
}
szFPlaintextAnyLength[_bytesLength] = '\0';
}
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