AES算法的c++实现
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1、AES.h
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cstdlib>
#include<iostream>
#include<cmath> class AES{
public:
AES(unsigned char* key);
virtual ~AES();
unsigned char* Cipher(unsigned char* input);//16字节为一组
unsigned char* InvCipher(unsigned char* input);
void* Cipher(void* input, int length=);//初始化过了
void* InvCipher(void* input, int length); private:
unsigned char Sbox[];
unsigned char InvSbox[];//1字节=8位
unsigned char w[][][]; void KeyExpansion(unsigned char* key, unsigned char w[][][]);
unsigned char FFmul(unsigned char a, unsigned char b); void SubBytes(unsigned char state[][]);
void ShiftRows(unsigned char state[][]);
void MixColumns(unsigned char state[][]);
void AddRoundKey(unsigned char state[][], unsigned char k[][]); void InvSubBytes(unsigned char state[][]);
void InvShiftRows(unsigned char state[][]);
void InvMixColumns(unsigned char state[][]);
};
2、AES.cpp
#include "string.h"
#include "AES.h"
//unsigned char 8位 1字节
AES::AES(unsigned char* key){
unsigned char sBox[] ={
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
};
unsigned char invsBox[] = {
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
};
memcpy(Sbox, sBox, );
memcpy(InvSbox, invsBox, );
KeyExpansion(key, w);
}//构造函数 AES::~AES(){}//析构函数 unsigned char* AES::Cipher(unsigned char* input){//只往后16个字节
unsigned char state[][];
int i,r,c; for(r=; r<; r++){
for(c=; c< ;c++){
state[r][c] = input[c*+r];
}
} AddRoundKey(state,w[]);//原秘钥，一共11轮密钥 for(i=; i<=; i++){
SubBytes(state);
ShiftRows(state);
if(i!=)MixColumns(state);
AddRoundKey(state,w[i]);
} for(r=; r<; r++){
for(c=; c< ;c++){
input[c*+r] = state[r][c];
}
}
return input;
} unsigned char* AES::InvCipher(unsigned char* input){
unsigned char state[][];
int i,r,c; for(r=; r<; r++){
for(c=; c< ;c++){
state[r][c] = input[c*+r];
}
} AddRoundKey(state, w[]);//注意逆向的顺序
for(i=; i>=; i--){
InvShiftRows(state);
InvSubBytes(state);
AddRoundKey(state, w[i]);
if(i){
InvMixColumns(state);
}
} for(r=; r<; r++){
for(c=; c< ;c++){
input[c*+r] = state[r][c];
}
} return input;
} void* AES::Cipher(void* input, int length){
unsigned char* in = (unsigned char*) input;
int i;
if(!length){
while(*(in+length++));
in = (unsigned char*) input;
}
for(i=; i<length; i+=){
Cipher(in+i);
}
return input;
} void* AES::InvCipher(void* input, int length){
unsigned char* in = (unsigned char*) input;
int i;
for(i=; i<length; i+=){
InvCipher(in+i);
}
return input;
} void AES::KeyExpansion(unsigned char* key, unsigned char w[][][]){
int i,j,r,c;
unsigned char rc[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};//轮常量
for(r=; r<; r++){
for(c=; c<; c++){
w[][r][c] = key[r+c*];
}
}
for(i=; i<=; i++){
for(j=; j<; j++){
unsigned char t[];
for(r=; r<; r++){
t[r] = j ? w[i][r][j-] : w[i-][r][];
}
if(j == ){
for(r=; r<=; r++){
t[r] = Sbox[t[(r+)%]];
}
t[] ^= rc[i-];
}
for(r=; r<; r++){
w[i][r][j] = w[i-][r][j] ^ t[r];
}
}
}
}
//有限域乘法
unsigned char AES::FFmul(unsigned char a, unsigned char b){
unsigned char bw[];
unsigned char res=;
int i;
bw[] = b;
for(i=; i<; i++){
bw[i] = bw[i-]<<;
if(bw[i-]&0x80){
bw[i]^=0x1b;
}
}
for(i=; i<; i++){
if((a>>i)&0x01){
res ^= bw[i];
}
}
return res;
} //字节替代
void AES::SubBytes(unsigned char state[][]){
int r,c;
for(r=; r<; r++){
for(c=; c<; c++){
state[r][c] = Sbox[state[r][c]];
}
}
}
//行移位变换
void AES::ShiftRows(unsigned char state[][]){
unsigned char t[];
int r,c;
for(r=; r<; r++){
for(c=; c<; c++){
t[c] = state[r][(c+r)%];
}
for(c=; c<; c++){
state[r][c] = t[c];
}
}
}
//列混淆变换
void AES::MixColumns(unsigned char state[][]){
unsigned char t[];
int r,c;
for(c=; c< ; c++){
for(r=; r<; r++){
t[r] = state[r][c];
}
for(r=; r<; r++){
state[r][c] = FFmul(0x02, t[r])
^ FFmul(0x03, t[(r+)%])
^ FFmul(0x01, t[(r+)%])
^ FFmul(0x01, t[(r+)%]);
}
}
}
//轮密钥加变换，正逆是一样的，异或
void AES::AddRoundKey(unsigned char state[][], unsigned char k[][]){
int r,c;
for(c=; c<; c++){
for(r=; r<; r++){
state[r][c] ^= k[r][c];
}
}
}
//逆字节替代
void AES::InvSubBytes(unsigned char state[][]){
int r,c;
for(r=; r<; r++){
for(c=; c<; c++){
state[r][c] = InvSbox[state[r][c]];
}
}
}
//逆行移位变换
void AES::InvShiftRows(unsigned char state[][]){
unsigned char t[];
int r,c;
for(r=; r<; r++){
for(c=; c<; c++){
t[c] = state[r][(c-r+)%];
}
for(c=; c<; c++){
state[r][c] = t[c];
}
}
}
//逆列混淆变换
void AES::InvMixColumns(unsigned char state[][]){
unsigned char t[];
int r,c;
for(c=; c< ; c++){
for(r=; r<; r++){
t[r] = state[r][c];
}
for(r=; r<; r++){
state[r][c] = FFmul(0x0e, t[r])
^ FFmul(0x0b, t[(r+)%])
^ FFmul(0x0d, t[(r+)%])
^ FFmul(0x09, t[(r+)%]);
}
}
}
3、main.cpp
#include "AES.h"
void print(unsigned char* state);
int main(int argc, char* argv[]){
unsigned char input[] ={
0x32, 0x43, 0xf6, 0xa8,
0x88, 0x5a, 0x30, 0x8d,
0x31, 0x31, 0x98, 0xa2,
0xe0, 0x37, 0x07, 0x34
};
unsigned char key[]={
0x2b, 0x7e, 0x15, 0x16,
0x28, 0xae, 0xd2, 0xa6,
0xab, 0xf7, 0x15, 0x88,
0x09, 0xcf, 0x4f, 0x3c
};//128位，16字节
AES aes(key); printf("Input:\n");
print(input); aes.Cipher(input);
printf("After Cipher:\n");
print(input); aes.InvCipher(input);
printf("After InvCipher:\n");
print(input); int j;
printf("\n");
char str[] = "Hello,My AES Cipher!";
for(j=; j<; j++)printf("%X ",(unsigned char)str[j]);
printf("\n");
aes.Cipher((void *)str);
for(j=; j<; j++)printf("%X ",(unsigned char)str[j]);
printf("\n");
aes.InvCipher((void *)str,);
for(j=; j<; j++)printf("%X ",(unsigned char)str[j]);
printf("\n"); return ;
} void print(unsigned char* state){
int i;
/*for(i=0; i<16; i++){
printf("%s%X ",state[i]>15 ? "" : "0", state[i]);
}*/
for(int i=;i<;i++) printf("%02x ",state[i]);
printf("\n");
}
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