AES C语言实现
1.圈密钥生成函数
//1、圈密钥生成函数
void ScheduleKey(unsigned char *inkey,unsigned char *outkey,int Nk,int Nr)
{
unsigned char temp[4],t;
int x,i;
for(i=0;i<(4*Nk);i++)
{
outkey[i]=inkey[i];
}
i=Nk;
while(i<(4*(Nr+1)))
{
for(x=0;x<4;x++)
temp[x]=outkey[(4*(i-1))+x];
//i是4的倍数的时候
if(i%Nk==0)
{
t=temp[0];temp[0]=temp[1];temp[1]=temp[2];temp[2]=temp[3];temp[3]=t;
for(x=0;x<4;x++)
{
temp[x]=sbox[temp[x]];
}
temp[0]^=Rcon[(i/Nk)-1];
}
for(x=0;x<4;x++)
{
outkey[(4*i)+x]=outkey[(4*(i-Nk))+x]^temp[x];
}
++i;
}
}
2、 第i圈的加密圈函数
//2、第i圈的加密函数
void iEncrypt(unsigned char *blk,unsigned char *expansionkey,int Nr){
int round;
for(round=1;round<=(Nr-1);round++)
{
SubBytes(blk);//s盒代替
ShiftRows(blk);//行移位
MixColumns(blk);//列混合
AddRoundKey(blk,expansionkey,round);//圈密钥加
}
}
3、第10圈的加密圈函数
//3、第10圈的加密函数
void tEncrypt(unsigned char *blk,unsigned char *expansionkey,int Nr){
SubBytes(blk);//s盒代替
ShiftRows(blk);//行移位
AddRoundKey(blk,expansionkey,Nr);//圈密钥加
}
4、第i圈的解密圈函数
void iDecrypt(unsigned char *blk,unsigned char *expansionkey,int Nr){
int x;
for(x=(Nr-1);x>=1;x--)
{
AddRoundKey(blk,expansionkey,x);//圈密钥加
Contrary_MixColumns(blk);//逆向列混合
Contrary_ShiftRows(blk);//逆向行移位
Contrary_SubBytes(blk);//逆向s盒
}
}
5、第10圈的解密圈函数
//5、第10圈的解密函数
void tDecrypt(unsigned char *blk,unsigned char *expansionkey,int Nr){
AddRoundKey(blk,expansionkey,Nr);//圈密钥加
Contrary_ShiftRows(blk);//逆向行移位
Contrary_SubBytes(blk);//逆向s盒
}
6、加密函数
//6、加密函数
void AesEncrypt(unsigned char *blk,unsigned char *expansionkey,int Nr)
{
//第1轮之前的圈密钥加
AddRoundKey(blk,expansionkey,0);//圈密钥加
//第1-9轮
iEncrypt(blk,expansionkey,Nr);
//第10轮
tEncrypt(blk,expansionkey,Nr);
}
7、解密函数
//7、解密函数
void Contrary_AesEncrypt(unsigned char *blk,unsigned char *expansionkey,int Nr)
{
//第10轮逆向
tDecrypt(blk,expansionkey,Nr);
//1-9轮逆向
iDecrypt(blk,expansionkey,Nr);
//最开始的逆向圈密钥加
AddRoundKey(blk,expansionkey,0);//圈密钥加
}
8、文件加密函数
//8、文件加密函数
void fileencode(){
FILE *fp;
unsigned char key[17];
char pt[17] ;
unsigned char expansionkey[15*16];
char filename[10000];
printf("please input key\n");
scanf("%s",key);
ScheduleKey(key,expansionkey,4,10);
printf("please input file pwd\n");
scanf("%s",filename);
int i;
long long length;
if( (fp=fopen(filename,"rt")) == NULL ){
printf("Cannot open file, press any key to exit!");
getch();
exit(1);
}
FILE *fpWrite=fopen("AES_c.txt","w");
fseek(fp,0,SEEK_END);
length = ftell(fp);
printf("文件长度为%lld\n",length);
fp = fopen(filename, "r");
if(fpWrite==NULL)
return 0;
while(fgets (pt, 17, fp)!=NULL)
{
AesEncrypt(pt,expansionkey,10);
fputs(pt,fpWrite);
}
fclose(fp);
fclose(fpWrite);
printf("已生成密文AES_c.txt");
}
9、文件解密函数
//9、文件解密函数
void filedecode(){
FILE *fp;
char ch;
unsigned char key[17];
unsigned char expansionkey[15*16];
char filename[10000];
char pt[17];
printf("please input key\n");
scanf("%s",key);
ScheduleKey(key,expansionkey,4,10);
printf("please input file pwd\n");
scanf("%s",filename);
int i=0;
if( (fp=fopen(filename,"rt")) == NULL )
{
printf("Cannot open file, press any key to exit!");
getch();
exit(1);
}
FILE *fpWrite=fopen("AES_m.txt","w");
fp = fopen(filename, "r");
if(fpWrite==NULL)
return 0;
while(fgets (pt, 17, fp)!=NULL)
{
Contrary_AesEncrypt(pt,expansionkey,10);
fputs(pt,fpWrite);
}
fclose(fp);
fclose(fpWrite);
printf("已生成明文AES_m.txt");
}
10、单分组明文加解密正确性测试程序main1( )
int main1(void){
unsigned char pt[17],key[17];
unsigned char expansionkey[15*16];
int i;
int j;
printf("please input plaintext\n");
scanf("%s",pt);
printf("please input key\n");
scanf("%s",key);
/*加密*/
ScheduleKey(key,expansionkey,4,10); //1、密钥扩展生成
AesEncrypt(pt,expansionkey,10); //2、AES 加密
printf("AesEncrypt text is: "); //输出密文
for (i = 0; i < 16; i++)
{
printf("%c",pt[i]);
}
printf("\n");
printf("\n");
/*解密*/
Contrary_AesEncrypt(pt,expansionkey,10);//AES 解密
printf("after Contrary_AesEncrypt,plaintext is: ");//输出明文
for (i = 0; i < 16; i++)
{
printf("%c", pt[i]);
}
printf("\n");
printf("\n");
return 0;
}
11、文件加解密测试程序filemain( )
//11、文件加解密测试程序
int filemain(){
int n;
menu1();
scanf("%d",&n);
if(n==1){
fileencode();
}
else if(n==2){
filedecode();
}
return 0;
}
整体代码
#include <stdio.h>
#include<string.h>
//初始数据
/*s盒矩阵*/
static const unsigned char sbox[256]={
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,
};
//逆向S盒
static const unsigned char contrary_sbox[256]={
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,
};
/*轮常量表*/
static const unsigned char Rcon[10]={
0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36};
//计算函数
/*有限域*2乘法*/
static unsigned char x2time(unsigned char x)
{
if (x&0x80)
{
return (((x<<1)^0x1B)&0xFF);
}
return x<<1;
}
/*有限域*3乘法*/
static unsigned char x3time(unsigned char x)
{
return (x2time(x)^x);
}
/*有限域*4乘法*/
static unsigned char x4time(unsigned char x)
{
return ( x2time(x2time(x)) );
}
/*有限域*8乘法*/
static unsigned char x8time(unsigned char x)
{
return ( x2time(x2time(x2time(x))) );
}
/*有限域9乘法*/
static unsigned char x9time(unsigned char x)
{
return ( x8time(x)^x );
}
/*有限域*B乘法*/
static unsigned char xBtime(unsigned char x)
{
return ( x8time(x)^x2time(x)^x );
}
/*有限域*D乘法*/
static unsigned char xDtime(unsigned char x)
{
return ( x8time(x)^x4time(x)^x );
}
/*有限域*E乘法*/
static unsigned char xEtime(unsigned char x)
{
return ( x8time(x)^x4time(x)^x2time(x) );
}
//加密操作
/*列混合*/
static void MixColumns(unsigned char *col)
{
unsigned char tmp[4],xt[4];
int i;
for(i=0;i<4;i++,col+=4)
{
tmp[0]=x2time(col[0])^x3time(col[1])^col[2]^col[3];
tmp[1]=col[0]^x2time(col[1])^x3time(col[2])^col[3];
tmp[2]=col[0]^col[1]^x2time(col[2])^x3time(col[3]);
tmp[3]=x3time(col[0])^col[1]^col[2]^x2time(col[3]);
col[0]=tmp[0];
col[1]=tmp[1];
col[2]=tmp[2];
col[3]=tmp[3];
}
}
//逆向列混合
static void Contrary_MixColumns(unsigned char *col)
{
unsigned char tmp[4];
unsigned char xt2[4];
unsigned char xt4[4];
unsigned char xt8[4];
int x;
for(x=0;x<4;x++,col+=4)
{
tmp[0]=xEtime(col[0])^xBtime(col[1])^xDtime(col[2])^x9time(col[3]);
tmp[1]=x9time(col[0])^xEtime(col[1])^xBtime(col[2])^xDtime(col[3]);
tmp[2]=xDtime(col[0])^x9time(col[1])^xEtime(col[2])^xBtime(col[3]);
tmp[3]=xBtime(col[0])^xDtime(col[1])^x9time(col[2])^xEtime(col[3]);
col[0]=tmp[0];
col[1]=tmp[1];
col[2]=tmp[2];
col[3]=tmp[3];
}
}
/*行移位*/
static void ShiftRows(unsigned char *col)
{
unsigned char t;
t=col[1];col[1]=col[5];col[5]=col[9];col[9]=col[13];col[13]=t;
t=col[2];col[2]=col[10];col[10]=t;
t=col[6];col[6]=col[14];col[14]=t;
t=col[15];col[15]=col[11];col[11]=col[7];col[7]=col[3];col[3]=t;
}
//逆向行移位
static void Contrary_ShiftRows(unsigned char *col)
{
unsigned char t;
t=col[13];col[13]=col[9];col[9]=col[5];col[5]=col[1];col[1]=t;
t=col[2];col[2]=col[10];col[10]=t;
t=col[6];col[6]=col[14];col[14]=t;
t=col[3];col[3]=col[7];col[7]=col[11];col[11]=col[15];col[15]=t;
}
/*s盒字节代替*/
static void SubBytes(unsigned char *col)
{
int x;
for(x=0;x<16;x++)
{
col[x]=sbox[col[x]];
}
}
//逆向s盒代替
static void Contrary_SubBytes(unsigned char *col)
{
int x;
for(x=0;x<16;x++)
{
col[x]=contrary_sbox[col[x]];
}
}
/*圈密钥加*/
static void AddRoundKey(unsigned char *col,unsigned char *expansionkey,int round)//密匙加
{
int x;
for(x=0;x<16;x++)
{
col[x]^=expansionkey[(round<<4)+x];
}
}
//2、第i圈的加密函数
void iEncrypt(unsigned char *blk,unsigned char *expansionkey,int Nr){
int round;
for(round=1;round<=(Nr-1);round++)
{
SubBytes(blk);//s盒代替
ShiftRows(blk);//行移位
MixColumns(blk);//列混合
AddRoundKey(blk,expansionkey,round);//圈密钥加
}
}
//4、第i圈的解密函数
void iDecrypt(unsigned char *blk,unsigned char *expansionkey,int Nr){
int x;
for(x=(Nr-1);x>=1;x--)
{
AddRoundKey(blk,expansionkey,x);//圈密钥加
Contrary_MixColumns(blk);//逆向列混合
Contrary_ShiftRows(blk);//逆向行移位
Contrary_SubBytes(blk);//逆向s盒
}
}
//3、第10圈的加密函数
void tEncrypt(unsigned char *blk,unsigned char *expansionkey,int Nr){
SubBytes(blk);//s盒代替
ShiftRows(blk);//行移位
AddRoundKey(blk,expansionkey,Nr);//圈密钥加
}
//5、第10圈的解密函数
void tDecrypt(unsigned char *blk,unsigned char *expansionkey,int Nr){
AddRoundKey(blk,expansionkey,Nr);//圈密钥加
Contrary_ShiftRows(blk);//逆向行移位
Contrary_SubBytes(blk);//逆向s盒
}
//6、加密函数
void AesEncrypt(unsigned char *blk,unsigned char *expansionkey,int Nr)
{
//第1轮之前的圈密钥加
AddRoundKey(blk,expansionkey,0);//圈密钥加
//第1-9轮
iEncrypt(blk,expansionkey,Nr);
//第10轮
tEncrypt(blk,expansionkey,Nr);
}
//7、解密函数
void Contrary_AesEncrypt(unsigned char *blk,unsigned char *expansionkey,int Nr)
{
//第10轮逆向
tDecrypt(blk,expansionkey,Nr);
//1-9轮逆向
iDecrypt(blk,expansionkey,Nr);
//最开始的逆向圈密钥加
AddRoundKey(blk,expansionkey,0);//圈密钥加
}
//1、圈密钥生成函数
void ScheduleKey(unsigned char *inkey,unsigned char *outkey,int Nk,int Nr)
{
unsigned char temp[4],t;
int x,i;
for(i=0;i<(4*Nk);i++)
{
outkey[i]=inkey[i];
}
i=Nk;
while(i<(4*(Nr+1)))
{
for(x=0;x<4;x++)
temp[x]=outkey[(4*(i-1))+x];
//i是4的倍数的时候
if(i%Nk==0)
{
t=temp[0];temp[0]=temp[1];temp[1]=temp[2];temp[2]=temp[3];temp[3]=t;
for(x=0;x<4;x++)
{
temp[x]=sbox[temp[x]];
}
temp[0]^=Rcon[(i/Nk)-1];
}
for(x=0;x<4;x++)
{
outkey[(4*i)+x]=outkey[(4*(i-Nk))+x]^temp[x];
}
++i;
}
}
//读取文件pt数组中
//8、文件加密函数
void fileencode(){
FILE *fp;
unsigned char key[17];
char pt[17] ;
unsigned char expansionkey[15*16];
char filename[10000];
printf("please input key\n");
scanf("%s",key);
ScheduleKey(key,expansionkey,4,10);
printf("please input file pwd\n");
scanf("%s",filename);
int i;
long long length;
if( (fp=fopen(filename,"rt")) == NULL ){
printf("Cannot open file, press any key to exit!");
getch();
exit(1);
}
FILE *fpWrite=fopen("AES_c.txt","w");
fseek(fp,0,SEEK_END);
length = ftell(fp);
printf("文件长度为%lld\n",length);
fp = fopen(filename, "r");
if(fpWrite==NULL)
return 0;
while(fgets (pt, 17, fp)!=NULL)
{
AesEncrypt(pt,expansionkey,10);
fputs(pt,fpWrite);
}
fclose(fp);
fclose(fpWrite);
printf("已生成密文AES_c.txt");
}
//9、文件解密函数
void filedecode(){
FILE *fp;
char ch;
unsigned char key[17];
unsigned char expansionkey[15*16];
char filename[10000];
char pt[17];
printf("please input key\n");
scanf("%s",key);
ScheduleKey(key,expansionkey,4,10);
printf("please input file pwd\n");
scanf("%s",filename);
int i=0;
if( (fp=fopen(filename,"rt")) == NULL )
{
printf("Cannot open file, press any key to exit!");
getch();
exit(1);
}
FILE *fpWrite=fopen("AES_m.txt","w");
fp = fopen(filename, "r");
if(fpWrite==NULL)
return 0;
while(fgets (pt, 17, fp)!=NULL)
{
Contrary_AesEncrypt(pt,expansionkey,10);
fputs(pt,fpWrite);
}
fclose(fp);
fclose(fpWrite);
printf("已生成明文AES_m.txt");
}
//菜单
void menu(){
printf("----------------------\n");
printf("- -\n");
printf("- -\n");
printf("- 1、分组加密 -\n");
printf("- 2、文件加密 -\n");
printf("- -\n");
printf("- -\n");
printf("----------------------\n");
}
void menu1(){
printf("----------------------\n");
printf("- -\n");
printf("- -\n");
printf("- 1、加密文件 -\n");
printf("- 2、解密文件 -\n");
printf("- -\n");
printf("- -\n");
printf("----------------------\n");
}
//10、单分组明文加解密正确性测试程序main( )
int main1(void){
unsigned char pt[17],key[17];
unsigned char expansionkey[15*16];
int i;
int j;
printf("please input plaintext\n");
scanf("%s",pt);
printf("please input key\n");
scanf("%s",key);
/*加密*/
ScheduleKey(key,expansionkey,4,10); //1、密钥扩展生成
AesEncrypt(pt,expansionkey,10); //2、AES 加密
printf("AesEncrypt text is: "); //输出密文
for (i = 0; i < 16; i++)
{
printf("%c",pt[i]);
}
printf("\n");
printf("\n");
/*解密*/
Contrary_AesEncrypt(pt,expansionkey,10);//AES 解密
printf("after Contrary_AesEncrypt,plaintext is: ");//输出明文
for (i = 0; i < 16; i++)
{
printf("%c", pt[i]);
}
printf("\n");
printf("\n");
return 0;
}
//11、文件加解密测试程序
int filemain(){
int n;
menu1();
scanf("%d",&n);
if(n==1){
fileencode();
}
else if(n==2){
filedecode();
}
return 0;
}
int main(void){
int n;
menu();
scanf("%d",&n);
if(n==1)
main1();
else if(n==2)
filemain();
}