AES加密算法的C--实现过程.docx

//AES.H

#ifndef _AES_H_
#define _AES_H_

#include "stdafx.h"

#define AES_KEY_ROW_NUMBER 4
#define AES_KEY_COLUMN_NUMBER 4
#define AES_ROUND_COUNT 10

class AES : public Encryption
{
public:
AES(void);
AES(BYTE* key);
virtual ~AES(void);

void Encrypt(BYTE *, BYTE *,size_t);
void Decrypt(BYTE *, BYTE *,size_t);

private:

BYTE swapbox[11][4][4];

BYTE* Cipher(BYTE* input);
BYTE* InvCipher(BYTE* input);

BYTE* Cipher(void * input, size_t length);
BYTE* InvCipher(void * input, size_t length);

void KeyExpansion(BYTE* key, BYTE w[][4][AES_KEY_COLUMN_NUMBER]);
BYTE FFmul(BYTE a, BYTE b);

void SubBytes(BYTE state[][AES_KEY_COLUMN_NUMBER]);
void ShiftRows(BYTE state[][AES_KEY_COLUMN_NUMBER]);
void MixColumns(BYTE state[][AES_KEY_COLUMN_NUMBER]);
void AddRoundKey(BYTE state[][AES_KEY_COLUMN_NUMBER], BYTE k[][AES_KEY_COLUMN_NUMBER]);

void InvSubBytes(BYTE state[][AES_KEY_COLUMN_NUMBER]);
void InvShiftRows(BYTE state[][AES_KEY_COLUMN_NUMBER]);
void InvMixColumns(BYTE state[][AES_KEY_COLUMN_NUMBER]);

};
#endif // _AES_H_

//Encryption.h

#ifndef _ENCRYPTION_H_
#define _ENCRYPTION_H_

#include "stdafx.h"

class Encryption
{
public:

virtual void Encrypt(BYTE *, BYTE *,size_t) = 0;
virtual void Decrypt(BYTE *, BYTE *,size_t) = 0;
};
#endif

//EncryptionFactory.h

#ifndef _ENCRYPTION_FACTORY_H_
#define _ENCRYPTION_FACTORY_H_

#include "Encryption.h"
#include "stdafx.h"

class EncryptionFactory
{
public:
EncryptionFactory(void);
virtual ~EncryptionFactory(void);
static Encryption* getEncryption(int encryptionType,BYTE* key);
private :
static Encryption* encry;
};
#endif

//AES.cpp

#include "stdafx.h"
#include "AES.h"
#include <stdlib.h>
#include <memory.h>

//permutebox
static unsigned char permutebox[] =
{ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76, /*0*/
0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0, /*1*/
0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15, /*2*/
0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75, /*3*/
0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84, /*4*/
0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf, /*5*/
0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8, /*6*/
0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2, /*7*/
0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73, /*8*/
0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb, /*9*/
0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79, /*a*/
0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08, /*b*/
0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a, /*c*/
0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e, /*d*/
0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf, /*e*/
0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16 /*f*/
};
//inversepermutationbox
static unsigned char inversepermutationbox[]=
{ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
0x52,0x09,0x6a,0xd5,0x30,0x36,0xa5,0x38,0xbf,0x40,0xa3,0x9e,0x81,0xf3,0xd7,0xfb, /*0*/
0x7c,0xe3,0x39,0x82,0x9b,0x2f,0xff,0x87,0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb, /*1*/
0x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d,0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0x4e, /*2*/
0x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2,0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25, /*3*/
0x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16,0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92, /*4*/
0x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda,0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84, /*5*/
0x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a,0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06, /*6*/
0xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02,0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b, /*7*/
0x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea,0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73, /*8*/
0x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85,0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e, /*9*/
0x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89,0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b, /*a*/
0xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20,0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4, /*b*/
0x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31,0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f, /*c*/
0x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d,0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef, /*d*/
0xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0,0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61, /*e*/
0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26,0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d /*f*/
};

AES::AES(void)
{
}
AES::AES(unsigned char* key)
{
KeyExpansion(key, swapbox);
}

AES::~AES(void)
{
}

/************************************************************************/
/* create a Encrypt method */
/* param : data encrypt data */
/* param : encryptArray encryptArray */
/* param : len encrypt data length */
/* return : void */
/************************************************************************/

void AES::Encrypt(unsigned char* data ,unsigned char * encryptArray,size_t len)
{
memcpy(encryptArray,data,len);
Cipher((void *)encryptArray,len);

}

/************************************************************************/
/* create a Decrypt method */
/* param : data decrypt data */
/* param : decryptArray decryptArray */
/* param : len decrypt data length */
/* return : void */
/************************************************************************/

void AES::Decrypt(unsigned char * data,unsigned char * decryptArray,size_t len)
{
memcpy(decryptArray,data,len);
InvCipher((void *)decryptArray,len);
}

/************************************************************************/
/* create a Cipher method only one time Encrypt */
/* param : input input encrypt data */
/* return : unsigned char * */
/************************************************************************/

unsigned char* AES::Cipher(unsigned char* input)
{

unsigned char state[AES_KEY_ROW_NUMBER][AES_KEY_COLUMN_NUMBER];
int i,r,c;

for(r=0; r<AES_KEY_ROW_NUMBER; r++)
{
for(c=0; c<AES_KEY_COLUMN_NUMBER ;c++)
{
state[r][c] = input[c*AES_KEY_COLUMN_NUMBER+r];
}
}

AddRoundKey(state,swapbox[0]);

for(i=1; i<=AES_ROUND_COUNT; i++)
{
SubBytes(state);
ShiftRows(state);
if(i!=AES_ROUND_COUNT)MixColumns(state);
AddRoundKey(state,swapbox[i]);
}

for(r=0; r<AES_KEY_ROW_NUMBER; r++)
{
for(c=0; c<AES_KEY_COLUMN_NUMBER ;c++)
{
input[c*AES_KEY_COLUMN_NUMBER+r] = state[r][c];
}
}
return input;
}
/************************************************************************/
/* create a InvCipher method only one time decrypt */
/* param : input input decrypt data */
/* return : unsigned char * */
/************************************************************************/
unsigned char* AES::InvCipher(unsigned char* input)
{
unsigned char state[AES_KEY_ROW_NUMBER][AES_KEY_COLUMN_NUMBER];
int i,r,c;

for(r=0; r<AES_KEY_ROW_NUMBER; r++)
{
for(c=0; c<AES_KEY_COLUMN_NUMBER ;c++)
{
state[r][c] = input[c*AES_KEY_COLUMN_NUMBER+r];
}
}

AddRoundKey(state, swapbox[10]);
for(i=9; i>=0; i--)
{
InvShiftRows(state);
InvSubBytes(state);
AddRoundKey(state, swapbox[i]);
if(i)
{
InvMixColumns(state);
}
}
for(r=0; r<AES_KEY_ROW_NUMBER; r++)
{
for(c=0; c<AES_KEY_COLUMN_NUMBER ;c++)
{
input[c*AES_KEY_COLUMN_NUMBER+r] = state[r][c];
}
}
return input;
}
/************************************************************************/
/* Create a specified length of data encryption method */
/* param : input input data encryption */
/* param : length Input the length of the encrypted data */
/* return : unsigned char * */
/************************************************************************/
unsigned char* AES::Cipher(void * input, size_t length)
{
unsigned char* in = (unsigned char*) input;
size_t i;
if(!length)
{
while(*(in+length++));
in = (unsigned char*) input;
}
for(i=0; i<length; i+=16)
{
Cipher(in+i);
}
return (unsigned char*)input;
}
/************************************************************************/
/* Create a specified length of InvCipher method */
/* param : input input data InvCipher */
/* param : length Input the length of the InvCipher data */
/* return : unsigned char * */
/************************************************************************/
unsigned char* AES::InvCipher(void * input, size_t length)
{
unsigned char* in = (unsigned char*) input;
size_t i;
for(i=0; i<length; i+=16)
{
InvCipher(in+i);
}
return (unsigned char*)input;
}
/************************************************************************/
/*Create key method */
/* param : key input data encryption key */
/* param : swapbox Conversion of key array */
/* return : void */
/************************************************************************/
void AES::KeyExpansion(unsigned char* key, unsigned char swapbox[][4][4])
{
int i,j,r,c;
unsigned char rc[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};
for(r=0; r<AES_KEY_ROW_NUMBER; r++)
{
for(c=0; c<AES_KEY_COLUMN_NUMBER; c++)
{
swapbox[0][r][c] = key[r+c*AES_KEY_COLUMN_NUMBER];
}
}
for(i=1; i<=10; i++)
{
for(j=0; j<AES_KEY_COLUMN_NUMBER; j++)
{
unsigned char t[AES_KEY_ROW_NUMBER];
for(r=0; r<AES_KEY_ROW_NUMBER; r++)
{
t[r] = j ? swapbox[i][r][j-1] : swapbox[i-1][r][3];
}
if(j == 0)
{
unsigned char temp = t[0];
for(r=0; r<AES_KEY_ROW_NUMBER-1; r++)
{
t[r] = permutebox[t[(r+1)%AES_KEY_ROW_NUMBER]];
}
t[3] = permutebox[temp];
t[0] ^= rc[i-1];
}
for(r=0; r<AES_KEY_ROW_NUMBER; r++)
{
swapbox[i][r][j] = swapbox[i-1][r][j] ^ t[r];
}
}
}
}

/************************************************************************/
/*Create mixed operation method ranks */
/* param : a row char */
/* param : b column char */
/* return : unsigned char */
/************************************************************************/

unsigned char AES::FFmul(unsigned char a, unsigned char b)
{
unsigned char bw[AES_KEY_ROW_NUMBER];
unsigned char res=0;
int i;
bw[0] = b;
for(i=1; i<AES_KEY_ROW_NUMBER; i++)
{
bw[i] = bw[i-1]<<1;
if(bw[i-1]&0x80)
{
bw[i]^=0x1b;
}
}
for(i=0; i<AES_KEY_ROW_NUMBER; i++)
{
if((a>>i)&0x01)
{
res ^= bw[i];
}
}
return res;
}
/************************************************************************/
/* Create bytes alternatives */
/* param : state[][] Byte array alternative */
/* return : void */
/************************************************************************/
void AES::SubBytes(unsigned char state[][AES_KEY_COLUMN_NUMBER])
{
int r,c;
for(r=0; r<AES_KEY_ROW_NUMBER; r++)
{
for(c=0; c<AES_KEY_COLUMN_NUMBER; c++)
{
state[r][c] = permutebox[state[r][c]];
}
}
}
/************************************************************************/
/* Create rows transform method */
/* param : state[][] line array alternative */
/* return : void */
/************************************************************************/
void AES::ShiftRows(unsigned char state[][AES_KEY_COLUMN_NUMBER])
{
unsigned char t[AES_KEY_COLUMN_NUMBER];
int r,c;
for(r=1; r<AES_KEY_ROW_NUMBER; r++)
{
for(c=0; c<AES_KEY_COLUMN_NUMBER; c++)
{
t[c] = state[r][(c+r)%AES_KEY_COLUMN_NUMBER];
}
for(c=0; c<AES_KEY_COLUMN_NUMBER; c++)
{
state[r][c] = t[c];
}
}
}
/************************************************************************/
/* Create columns transform method */
/* param : state[][] columns array alternative */
/* return : void */
/************************************************************************/
void AES::MixColumns(unsigned char state[][AES_KEY_COLUMN_NUMBER])
{
unsigned char t[AES_KEY_ROW_NUMBER];
int r,c;
for(c=0; c< AES_KEY_COLUMN_NUMBER; c++)
{
for(r=0; r<AES_KEY_ROW_NUMBER; r++)
{
t[r] = state[r][c];
}
for(r=0; r<AES_KEY_ROW_NUMBER; r++)
{
state[r][c] = FFmul(0x02, t[r])
^ FFmul(0x03, t[(r+1)%AES_KEY_COLUMN_NUMBER])
^ FFmul(0x01, t[(r+2)%AES_KEY_COLUMN_NUMBER])
^ FFmul(0x01, t[(r+3)%AES_KEY_COLUMN_NUMBER]);
}
}
}

/************************************************************************/
/*Create round keys plus transform method */
/* param : state[][] keys plus array alternative */
/* param : k[][] temp array alternative */
/* return : void */
/************************************************************************/
void AES::AddRoundKey(unsigned char state[][AES_KEY_COLUMN_NUMBER], unsigned char k[][AES_KEY_COLUMN_NUMBER])
{
int r,c;
fo