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des.cpp
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#include "des.h"
#include <QFile>
#include <QByteArray>
#include <QDebug>
#include <QMessageBox>
#include "mainwindow.h"
#include <QObject>
//初始置换表IP
const int DES::IP_Table[] =
{
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,
};
//逆初始置换表IP^-1
const int DES::IPR_Table[] =
{
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
};
//扩充置换表E
const int DES::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
};
//P置换
const int DES::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
};
//置换选择1
const int DES::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,
63,55,47,39,31,33,15,
7,62,54,46,38,30,22,
14,6,61,53,45,37,29,
21,13,5,28,20,12,4
};
//置换选择2
const int DES::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
};
//对左移次数的规定
const int DES::LOOP_Table[16] =
{
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};
//S-Box S盒
const int DES::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}
}
};
//加密文件,对文件进行读写操作
bool DES::FileEncryption(const QString FileName, const QString key,int mode, bool rm)
{
QFile srcfile(FileName), detfile(FileName+".ls");
unsigned char input[8];
unsigned char output[8];
long count;
// unsigned char *baseKey;
// QByteArray temp = key.toUtf8();
// baseKey=new unsigned char[key.length()+1];
// for(int i= 0 ;i<key.length();i++)
// {
// baseKey[i]= (unsigned char)temp.at(i);
// }
if( srcfile.open(QIODevice::ReadOnly) && detfile.open(QIODevice::ReadWrite) )
{
while( !srcfile.atEnd() )
{
memset((void *)input,0,8);
memset((void *)output,0,8);
count = srcfile.read((char*)input, 8);
if ( !RunDesEncryption(input, output, count, key,mode))
{
QMessageBox::critical(NULL, QObject::tr("错误"),QObject::tr("加密失败！"));
return false;
}
detfile.write((char*)output,8);
}
}
else
{
QMessageBox::critical(NULL, QObject::tr("错误"),QObject::tr("文件打开失败！"));
return false;
}
srcfile.close();
detfile.close();
if ( rm )
QFile::remove(FileName);
return true;
}
//解密文件
bool DES::FileDecryption(const QString FileName, const QString key, int mode, bool rm)
{
if ( !FileName.endsWith(".ls"))
{
QMessageBox::warning(NULL, QObject::tr("Warning"),QObject::tr("该文件并非本软件加密的文件，或者后缀不为'.ls'！"));
return false;
}
QString FileNameNew = FileName.left( (FileName.length() - 3) );
QFile srcfile(FileName), detfile(FileNameNew +".de");
unsigned char input[8];
unsigned char output[8];
long count = 0;
long tempsize = 0;
long size = 0;
//Qstring 和 char 转换
// unsigned char *baseKey;
// QByteArray temp = key.toUtf8();
// baseKey=new unsigned char[key.length()+1];
// for(int i= 0 ;i<key.length();i++)
// {
// baseKey[i]= (unsigned char)temp.at(i);
// }
if( srcfile.open(QIODevice::ReadOnly) && detfile.open(QIODevice::ReadWrite) )
{
size = srcfile.size();
while(!srcfile.atEnd())
{
memset((void *)input,0,8);
memset((void *)output,0,8);
count = srcfile.read((char*)input, 8);
tempsize+=8;
if ( !RunDesDecryption(input, output, count, key,mode))
{
QMessageBox::critical(NULL, QObject::tr("错误"),QObject::tr("解密失败！"));
return false;
}
if (tempsize < size)
{
detfile.write((char*)output,count);
}
else
{
break;
}
}
//下面用于判断是否有填充位，如果有，则不写入文件.
//这个处理感觉不太妥当，到时候看看有什么好方法
if ( output[7] < 8)
{
for(count = 8 - output[7]; count < 7; count++)
{
if(output[count] != output[7])
{
break;
}
}
}
if(count == 7)//有填充
{
detfile.write((char*)output,8 - output[7]);
}
else//无填充
{
detfile.write((char*)output,8);
}
if ( !detfile.rename(FileNameNew))//重命名
QMessageBox::critical(NULL, QObject::tr("错误"),FileNameNew+QObject::tr("原文件存在，请自行对解密后的文件重命名！"));
}
else
{
QMessageBox::critical(NULL, QObject::tr("错误"),QObject::tr("文件打开失败！"));
return false;
}
srcfile.close();
detfile.close();
if ( rm )
QFile::remove(FileName);
return true;
}
//调用RunDes进行加密
bool DES::RunDesEncryption(const unsigned char *input, unsigned char *output,\
unsigned int datalen,const QString key ,int mode)
{
// unsigned count = (datalen/9+1)*8;
unsigned keylen = ((key.length()/9)+1)*8 < 24 ? ((key.length()/9)+1)*8 : 24;
return RunDes(ENCRYPT, mode, input, output, datalen, (unsigned char *)key.toLatin1().data(), keylen);
}
//调用解密函数
bool DES::RunDesDecryption(const unsigned char *input, unsigned char *output,\
unsigned int datalen,const QString key ,int mode)
{
// unsigned count = (datalen/9+1)*8;
unsigned keylen = ((key.length()/9)+1)*8 < 24 ? ((key.length()/9)+1)*8 : 24;
return RunDes(DECRYPT, mode, input, output, datalen, (unsigned char *)key.toLatin1().data(), keylen);
}
//执行算法，成功返回true
//密钥(可为8位,16位,24位)支持3密钥
//密钥长度，多出24位部分将被自动裁减
bool DES::RunDes(bool bType,bool bMode,const unsigned char *In,unsigned char *Out,\
unsigned datalen,const unsigned char *Key,unsigned keylen)
{
unsigned char* tempBuf;
unsigned padlen = datalen;
unsigned char inbuf[datalen + 8];
//判断输入合法性
if(!(In && Out && Key && datalen && keylen>=8))
return false;
memset(inbuf, 0x00, sizeof(inbuf));
memcpy(inbuf, In, datalen);
//只处理8的整数倍，不足长度自己填充
if(datalen & 0x00000007)
{
if (!RunPad(PAD_PKCS_7, In, datalen, inbuf, padlen))
{
return false;
}
tempBuf = inbuf;
// qDebug() << "PAD_PKCS_7";
}
else
{
tempBuf = inbuf;
}
bool m_SubKey[3][16][48]; //秘钥
//构造并生成SubKeys
char nKey = (keylen>>3)>=3 ? 3: (keylen>>3);
for(int i=0;i<nKey;i++)
{
SetSubKey(&m_SubKey[i],&Key[i<<3]);
}
if(bMode == ECB) //ECB模式
{
if(nKey == 1) //单Key
{
for(int i=0,j = padlen>>3; i<j; ++i,Out+=8,tempBuf+=8)
{
DES_Unit(Out,tempBuf,&m_SubKey[0],bType);
}
}
else
if(nKey == 2) //3DES 2Key
{
for(int i=0,j = padlen>>3;i<j;++i,Out+=8,tempBuf+=8)
{
DES_Unit(Out,tempBuf,&m_SubKey[0],bType);
DES_Unit(Out,Out,&m_SubKey[1],!bType);
DES_Unit(Out,Out,&m_SubKey[0],bType);
}
}
else //3DES 3Key
{
for(int i=0,j=padlen>>3;i<j;++i,Out+=8,tempBuf+=8)
{
DES_Unit(Out,tempBuf,&m_SubKey[bType? 2 : 0],bType);
DES_Unit(Out,Out,&m_SubKey[1],!bType);
DES_Unit(Out,Out,&m_SubKey[bType? 0 : 2],bType);
}
}
}
else //CBC模式
{
unsigned char cvec[8] = ""; //扭转向量
unsigned char cvin[8] = ""; //中间变量
if(nKey == 1) //单Key
{
for(int i=0,j=padlen>>3;i<j;++i,Out+=8,tempBuf+=8)
{
if(bType == ENCRYPT)
{
for(int j=0;j<8;++j) //将输入与扭转变量异或
{
cvin[j] = tempBuf[j] ^ cvec[j];
}
}
else
{
memcpy(cvin,tempBuf,8);
}
DES_Unit(Out,cvin,&m_SubKey[0],bType);
if(bType == ENCRYPT)
{
memcpy(cvec,Out,8); //将输出设定为扭转变量
}
else
{
for(int j=0;j<8;++j) //将输出与扭转变量异或
{
Out[j] = Out[j] ^ cvec[j];
}
memcpy(cvec,cvin,8); //将输入设定为扭转变量
}
}
}
else
if(nKey == 2) //3DES CBC 2Key
{
for(int i=0,j=padlen>>3;i<j;++i,Out+=8,tempBuf+=8)
{
if(bType == ENCRYPT)
{
for(int j=0;j<8;++j) //将输入与扭转变量异或
{
cvin[j] = tempBuf[j] ^ cvec[j];
}
}
else
{
memcpy(cvin,tempBuf,8);
}
DES_Unit(Out,cvin,&m_SubKey[0],bType);
DES_Unit(Out,Out,&m_SubKey[1],!bType);
DES_Unit(Out,Out,&m_SubKey[0],bType);
if(bType == ENCRYPT)
{
memcpy(cvec,Out,8); //将输出设定为扭转变量
}
else
{
for(int j=0;j<8;++j) //将输出与扭转变量异或
{
Out[j] = Out[j] ^ cvec[j];
}
memcpy(cvec,cvin,8); //将输入设定为扭转变量
}
}
}
else //3DES CBC 3Key
{
for(int i=0,j=padlen >>3;i<j;++i,Out+=8,tempBuf+=8)
{
if(bType == ENCRYPT)
{
for(int j=0;j<8;++j) //将输入与扭转变量异或
{
cvin[j] = tempBuf[j] ^ cvec[j];
}
}
else
{
memcpy(cvin,tempBuf,8);
}
DES_Unit(Out,cvin,&m_SubKey[bType ? 2 : 0],bType);
DES_Unit(Out,Out,&m_SubKey[1],!bType);
DES_Unit(Out,Out,&m_SubKey[bType ? 0 : 2],bType);
if(bType == ENCRYPT)
{
memcpy(cvec,Out,8); //将输出设定为扭转变量
}
else
{
for(int j=0;j<8;++j) //将输出与扭转变量异或
{
Out[j] = Out[j] ^ cvec[j];
}
memcpy(cvec,cvin,8); //将输入设定为扭转变量
}
}
}
}
return true;
}
//DES单元运算
void DES::DES_Unit(unsigned char Out[], const unsigned char In[], const PSubKey pSubKey, bool Type)
{
bool M[64], tmp[32], *Li=&M[0], *Ri=&M[32];
ByteToBit(M, In, 64);
Transform(M, M, IP_Table, 64);
if( Type == ENCRYPT )
{
for(int i=0; i<16; ++i)
{
memcpy(tmp, Ri, 32); //Ri[i-1] 保存
F_func(Ri, (*pSubKey)[i]); //Ri[i-1]经过转化和SBox输出为P
Xor(Ri, Li, 32); //Ri[i] = P XOR Li[i-1]
memcpy(Li, tmp, 32); //Li[i] = Ri[i-1]
}
}
else
{
for(int i=15; i>=0; --i)
{
memcpy(tmp, Ri, 32); //Ri[i-1] 保存
F_func(Ri, (*pSubKey)[i]); //Ri[i-1]经过转化和SBox输出为P
Xor(Ri, Li, 32); //Ri[i] = P XOR Li[i-1]
memcpy(Li, tmp, 32); //Li[i] = Ri[i-1]
}
}
RotateL(M,64,32); //Ri与Li换位重组M
Transform(M, M, IPR_Table, 64); //最后结果进行转化
BitToByte(Out, M, 64); //组织成字符
}
//计算并填充子密钥到SubKey数据中
void DES::SetSubKey(PSubKey pSubKey, const unsigned char Key[])
{
bool K[64], *KL=&K[0], *KR=&K[28];
ByteToBit(K, Key, 64);
Transform(K, K, PC1_Table, 56);
for(int i=0; i<16; ++i)
{
RotateL(KL, 28, LOOP_Table[i]);
RotateL(KR, 28, LOOP_Table[i]);
Transform((*pSubKey)[i], K, PC2_Table, 48);
}
}
//把BYTE转化为Bit流
void DES::ByteToBit(Bit *Out, const unsigned char *In, int bits)
{
for(int i = 0; i < bits; ++i)
Out[i] = (In[i>>3]>>(7 - (i&7))) & 1;
}
//把Bit转化为Byte流
void DES::BitToByte(unsigned char *Out, const Bit *In, int bits)
{
memset(Out, 0, bits>>3);
for(int i = 0; i < bits; ++i)
Out[i>>3] |= In[i]<<(7 - (i&7));
}
//把BIT流按位向左迭代
void DES::RotateL(Bit *In, int len, int loop)
{
Bit Tmp[256];
memcpy(Tmp, In, loop);
memcpy(In, In+loop, len-loop);
memcpy(In+len-loop, Tmp, loop);
}
//把两个Bit流进行异或
void DES::Xor(Bit *InA, const Bit *InB, int len)
{
for(int i = 0; i < len; ++i)
InA[i] ^= InB[i];
}
//把两个Bit流按表进行位转化
void DES::Transform(Bit *Out, Bit *In, const int *Table, int len)
{
bool Tmp[256];
for(int i=0; i<len; ++i)
Tmp[i] = In[ Table[i]-1 ];
memcpy(Out, Tmp, len);
}
//实现数据加密S BOX模块
void DES::S_func(Bit Out[], const Bit In[])
{
for(int i=0,j,k; i<8; ++i,In+=6,Out+=4)
{
j = (In[0]<<1) + In[5];
k = (In[1]<<3) + (In[2]<<2) + (In[3]<<1) + In[4]; //组织SID下标
for(int l=0; l<4; ++l) //把相应4bit赋值
Out[l] = (S_Box[i][j][k]>>(3 - l)) & 1;
}
}
//实现数据加密到输出P
void DES::F_func(Bit In[32], const Bit Ki[48])
{
bool MR[48];
Transform(MR, In, E_Table, 48);
Xor(MR, Ki, 48);
S_func(In, MR);
Transform(In, In, P_Table, 32);
}
//对未满8字节的数据进行填充
bool DES::RunPad(int nType, const unsigned char *In, unsigned datalen, unsigned char *Out, unsigned &padlen)
{
if (In == NULL || datalen == 0 || Out == NULL)
return false;
int res = (datalen & 0x00000007);
if (res == 0)
{
padlen = datalen;
memcpy(Out, In, datalen);
return true;
}
padlen = (datalen+8-res);
memcpy(Out,In,datalen);
if(nType == PAD_PKCS_7)
{
memset(Out+datalen,8-res,8-res);//对空的地方填充空字节的总长度
}
else
{
return false;
}
return true;
}