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// AES.cpp: implementation of the CAES class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "AES.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
/////////////////////////////////
byte SBox[16][16] =
{{0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76},
{0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0},
{0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15},
{0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75},
{0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84},
{0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf},
{0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8},
{0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2},
{0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73},
{0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb},
{0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79},
{0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08},
{0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a},
{0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e},
{0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf},
{0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16}
};//s-盒
byte InvSBox[16][16]=
{{0x52,0x09,0x6a,0xd5,0x30,0x36,0xa5,0x38,0xbf,0x40,0xa3,0x9e,0x81,0xf3,0xd7,0xfb},
{0x7c,0xe3,0x39,0x82,0x9b,0x2f,0xff,0x87,0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb},
{0x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d,0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0x4e},
{0x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2,0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25},
{0x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16,0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92},
{0x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda,0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84},
{0x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a,0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06},
{0xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02,0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b},
{0x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea,0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73},
{0x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85,0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e},
{0x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89,0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b},
{0xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20,0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4},
{0x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31,0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f},
{0x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d,0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef},
{0xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0,0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61},
{0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26,0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d},
};//逆s-盒
byte Rc[31] =
{ 0x00, 0x01,0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8,
0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d,
0xfa, 0xef, 0xc5,0x91};
////////////////////////////////
CAES::CAES()//type=true时为加密文件,type=false时为加密字符串
{
int i;
for(i=0;i<4;i++)//置空
{
key[i]=NULL;
w[i]=NULL;
}
State=NULL;
/////////////////////////////////////////////////////
}
CAES::~CAES()
{
for(int i=0;i<4;i++)//释放原有的内存并置空
{
if(key[i]!=NULL)
{
delete key[i];
key[i]=NULL;
}
if(w[i]!=NULL)
{
delete w[i];
w[i]=NULL;
}
}
}
bool CAES::SetKeys(ENUM_KEYSIZE KeySize,CString sKey)
{
int i,j;
switch( KeySize )
{
case BIT128:
this->Nk = 4;//128÷8÷4
this->Nr = 10;//Nr = Nk + 6;
break;
case BIT192:
this->Nk = 6;//192÷8÷4
this->Nr = 12;//Nr = Nk + 6;
break;
case BIT256:
default:
this->Nk = 8;//256÷8÷4
this->Nr = 14;//Nr = Nk + 6;
break;
}
for(i=0;i<4;i++)//释放原有的内存并置空
{
if(key[i]!=NULL)
{
delete key[i];
key[i]=NULL;
}
if(w[i]!=NULL)
{
delete w[i];
w[i]=NULL;
}
}
for(i=0;i<4;i++)//动态创建字钥数组
{
key[i]=new byte[Nk];
if(key[i]==NULL)
{
return false;
}
}
for(i=0;i<4;i++)//动态创建密钥调度表
{
w[i]=new byte[4*(Nr+1)];
if(w[i]==NULL)
{
return false;
}
}
for(i=0;i<4;i++)//获得密钥
for(j=0;j<Nk;j++)
key[i][j]=sKey.GetAt(Nk*i+j);
KeyExpansion();//生成密钥调度表
return true;
}
void CAES::SubBytes()//字节代替变换
{
for(int i=0;i<4;i++)
for(int j=0;j<4;j++)
State[i][j]=SBox[(State[i][j]>>4)&0x0F][State[i][j]&0x0F];
}
void CAES::ShiftRows()//循环移位
{
BYTE4 temp[4];
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < 4; ++c)
{
temp[r].w[c] = this->State[r][c];
}
}
for (r = 1; r < 4; ++r)
{
for (int c = 0; c < 4; ++c)
{
this->State[r][c] = temp[ r].w[ (c + r) % 4 ];
}
}
}
void CAES::MixColumns()//列混合变换
{
BYTE4 temp[4];
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < 4; ++c)
{
temp[r].w[c] = this->State[r][c];
}
}
for (int c = 0; c < 4; ++c)
{
this->State[0][c] = (BYTE) (
(int)GfCalc(temp[0].w[c],MODE02) ^
(int)GfCalc(temp[1].w[c],MODE03) ^
(int)GfCalc(temp[2].w[c],MODE01) ^
(int)GfCalc(temp[3].w[c],MODE01) );
this->State[1][c] = (BYTE) (
(int)GfCalc(temp[0].w[c],MODE01) ^
(int)GfCalc(temp[1].w[c],MODE02) ^
(int)GfCalc(temp[2].w[c],MODE03) ^
(int)GfCalc(temp[3].w[c],MODE01) );
this->State[2][c] = (BYTE) (
(int)GfCalc(temp[0].w[c],MODE01) ^
(int)GfCalc(temp[1].w[c],MODE01) ^
(int)GfCalc(temp[2].w[c],MODE02) ^
(int)GfCalc(temp[3].w[c],MODE03) );
this->State[3][c] = (BYTE) (
(int)GfCalc(temp[0].w[c],MODE03) ^
(int)GfCalc(temp[1].w[c],MODE01) ^
(int)GfCalc(temp[2].w[c],MODE01) ^
(int)GfCalc(temp[3].w[c],MODE02) );
}
}
void CAES::AddRoundKey(int round)//轮密钥加法变换
{
int i,j,k=round*4;
for(i=0;i<4;i++)
for(j=0;j<4;j++)
State[i][j]=State[i][j]^w[i][k+j];
}
void CAES::KeyExpansion()//密钥扩展
{
byte temp[4],tp;
int i,j,x;
for(i=0;i<Nk;i++)//生成前Nk个字
{
w[0][i]=key[0][i];
w[1][i]=key[1][i];
w[2][i]=key[2][i];
w[3][i]=key[3][i];
}
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