AES加密c语言实现

#include <stdio.h>
/*aes_small.c*/
//辅助矩阵
/*s盒矩阵：The AES Substitution Table*/// 256 位的密匙256 位支持长度为32 个字符
static const unsigned char sbox[256]={ //static:内部变量  const：只读，不可变常量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 盒矩阵
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,//0x4e0x08,0x2e,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 The key schedule rcon table*/
static const unsigned char Rcon[10]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36};//辅助函数
/*有限域*2乘法 The x2time() function */
static unsigned char x2time(unsigned char x)
{if (x&0x80){return (((x<<1)^0x1B)&0xFF);}return x<<1;
}
/*有限域*3乘法 The x2time() function */
static unsigned char x3time(unsigned char x)
{return (x2time(x)^x);
}
/*有限域*4乘法 The x4time() function */
static unsigned char x4time(unsigned char x)
{return ( x2time(x2time(x)) );
}
/*有限域*8乘法 The x8time() function */
static unsigned char x8time(unsigned char x)
{return ( x2time(x2time(x2time(x))) );
}
/*有限域9乘法 The x9time() function */
static unsigned char x9time(unsigned char x)    //9:1001
{return ( x8time(x)^x );
}
/*有限域*B乘法 The xBtime() function */
static unsigned char xBtime(unsigned char x)    //B:1011
{return ( x8time(x)^x2time(x)^x );
}
/*有限域*D乘法 The xDtime() function */
static unsigned char xDtime(unsigned char x)    //D:1101
{return ( x8time(x)^x4time(x)^x );
}
/*有限域*E乘法 The xEtime() function */
static unsigned char xEtime(unsigned char x)    //E:1110
{return ( x8time(x)^x4time(x)^x2time(x) );
}/****************************************************************************************************************/
/*第三类操作：列混合操作 MixColumns: Process the entire block*/
static void MixColumns(unsigned char *col)//列混合
{unsigned char tmp[4],xt[4];int i;for(i=0;i<4;i++,col+=4)  //col代表一列的基地址，col+4:下一列的基地址{/*xt[0]=x2time(col[0]);xt[1]=x2time(col[1]);xt[2]=x2time(col[2]);xt[3]=x2time(col[3]);//xt[n]代表*2   xt[n]^col[n]代表*3   col[n]代表*1tmp[0]=(xt[0])^(xt[1]^col[1])^col[2]^col[3];   //2 3 1 1tmp[1]=col[0]^(xt[1])^(xt[2]^col[2])^col[3];  //1 2 3 1tmp[2]=col[0]^col[1]^(xt[2])^(xt[3]^col[3]);  //1 1 2 3tmp[3]=(xt[0]^col[0])^col[1]^col[2]^(xt[3]);  //3 1 1 2*/tmp[0]=x2time(col[0])^x3time(col[1])^col[2]^col[3]; //2 3 1 1tmp[1]=col[0]^x2time(col[1])^x3time(col[2])^col[3];   //1 2 3 1tmp[2]=col[0]^col[1]^x2time(col[2])^x3time(col[3]);   //1 1 2 3tmp[3]=x3time(col[0])^col[1]^col[2]^x2time(col[3]);   //3 1 1 2//修改后的值 直接在原矩阵上修改col[0]=tmp[0];col[1]=tmp[1];col[2]=tmp[2];col[3]=tmp[3];}
}
//逆向列混淆
static void Contrary_MixColumns(unsigned char *col)
{unsigned char tmp[4];unsigned char xt2[4];//colx2unsigned char xt4[4];//colx4unsigned char xt8[4];//colx8int x;for(x=0;x<4;x++,col+=4){/*xt2[0]=x2time(col[0]);xt2[1]=x2time(col[1]);xt2[2]=x2time(col[2]);xt2[3]=x2time(col[3]);xt4[0]=x2time(xt2[0]);xt4[1]=x2time(xt2[1]);xt4[2]=x2time(xt2[2]);xt4[3]=x2time(xt2[3]);xt8[0]=x2time(xt4[0]);xt8[1]=x2time(xt4[1]);xt8[2]=x2time(xt4[2]);xt8[3]=x2time(xt4[3]);tmp[0]=xt8[0]^xt4[0]^xt2[0]^xt8[1]^xt2[1]^col[1]^xt8[2]^xt4[2]^col[2]^xt8[3]^col[3];tmp[1]=xt8[0]^col[0]^xt8[1]^xt4[1]^xt2[1]^xt8[2]^xt2[2]^col[2]^xt8[3]^xt4[3]^col[3];tmp[2]=xt8[0]^xt4[0]^col[0]^xt8[1]^col[1]^xt8[2]^xt4[2]^xt2[2]^xt8[3]^xt2[3]^col[3];tmp[3]=xt8[0]^xt2[0]^col[0]^xt8[1]^xt4[1]^col[1]^xt8[2]^col[2]^xt8[3]^xt4[3]^xt2[3];*/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];}
}
/*第二类操作：行移位：行左循环移位 ShiftRows:Shifts the entire block*/
static void ShiftRows(unsigned char *col)//正向行移位
{/*1 5  9 13                5  9 13 1 2 6 10 14             10 14 2 63 7 11 15              15 3 7 114 8 12 16              16 4 8 12*/unsigned char t;/*1nd row*///左移1位t=col[1];col[1]=col[5];col[5]=col[9];col[9]=col[13];col[13]=t;/*2rd row*///左移2位，交换2次数字来实现t=col[2];col[2]=col[10];col[10]=t;t=col[6];col[6]=col[14];col[14]=t;/*3th row*///左移3位，相当于右移1次t=col[15];col[15]=col[11];col[11]=col[7];col[7]=col[3];col[3]=t;/*4th row*/ //第4行不移位
}
//逆向行移位
static void Contrary_ShiftRows(unsigned char *col)
{unsigned char t;/*1nd row*/t=col[13];col[13]=col[9];col[9]=col[5];col[5]=col[1];col[1]=t;/*2rd row*/t=col[2];col[2]=col[10];col[10]=t;t=col[6];col[6]=col[14];col[14]=t;/*3th row*/t=col[3];col[3]=col[7];col[7]=col[11];col[11]=col[15];col[15]=t;/*4th row*/ //第4行不移位
}
/*第一类操作：s盒字节代换替换 SubBytes*/
static void SubBytes(unsigned char *col)//字节代换
{int x;for(x=0;x<16;x++){col[x]=sbox[col[x]];}
}
//逆向字节代换
static void Contrary_SubBytes(unsigned char *col)
{int x;for(x=0;x<16;x++){col[x]=contrary_sbox[col[x]];}
}
/*第四类操作：轮密钥加 AddRoundKey*/
static void AddRoundKey(unsigned char *col,unsigned char *expansionkey,int round)//密匙加
{//扩展密钥：44*32bit =11*4* 4*8 =  16字节*11轮，每轮用16字节密钥//第0轮，只进行一次轮密钥加//第1-10轮，轮密钥加int x;               for(x=0;x<16;x++) //每1轮操作：4*32bit密钥 = 16个字节密钥{col[x]^=expansionkey[(round<<4)+x];}
}
/* AES加密总函数 10轮4类操作 Encrypt a single block with Nr Rounds(10,12,14)*/
void AesEncrypt(unsigned char *blk,unsigned char *expansionkey,int Nr)//加密一个区块
{//输入blk原文，直接在上面修改，输出blk密文//输入skey：//输入Nr = 10轮int round;//第1轮之前：轮密钥加AddRoundKey(blk,expansionkey,0);//第1-9轮：4类操作：字节代换、行移位、列混合、轮密钥加for(round=1;round<=(Nr-1);round++) {SubBytes(blk);     //输入16字节数组，直接在原数组上修改ShiftRows(blk);      //输入16字节数组，直接在原数组上修改MixColumns(blk); //输入16字节数组，直接在原数组上修改AddRoundKey(blk,expansionkey,round);}//第10轮：不进行列混合SubBytes(blk);ShiftRows(blk);AddRoundKey(blk,expansionkey,Nr);
}
//AES 解密总函数
void Contrary_AesEncrypt(unsigned char *blk,unsigned char *expansionkey,int Nr)
{int x;/* unsigned char *contrary_key=key;for(x=0;x<11;x++,key+=16)Contrary_MixColumns(key);*/AddRoundKey(blk,expansionkey,Nr);Contrary_ShiftRows(blk);Contrary_SubBytes(blk);for(x=(Nr-1);x>=1;x--){AddRoundKey(blk,expansionkey,x);Contrary_MixColumns(blk);Contrary_ShiftRows(blk);Contrary_SubBytes(blk);}AddRoundKey(blk,expansionkey,0);
}
/*//密钥编排，16字节--->44列32bit密钥生成--> 11组16字节:分别用于11轮 轮密钥加运算
Schedule a secret key for use.
*outkey[] must be 16*15 bytes in size
*Nk==number of 32 bit words in the key,e.g.,4,6,8
*Nr==number of rounds,e.g.,10,12,14
*/
void ScheduleKey(unsigned char *inkey,unsigned char *outkey,int Nk,int Nr)//安排一个保密密钥使用
{//inkey:初始16字节密钥key//outkey：11组*16字节扩展密钥expansionkey//Nk：4列//Nr：10轮roundunsigned char temp[4],t;int x,i;/*copy the key*///第0组：[0-3]直接拷贝for(i=0;i<(4*Nk);i++){outkey[i]=inkey[i];}//第1-10组：[4-43]i=Nk;while(i<(4*(Nr+1))) //i=4~43 WORD 32bit的首字节地址，每一个4字节{//1次循环生成1个字节扩展密钥，4次循环生成一个WORD//temp：4字节数组：代表一个WORD密钥/*temp=w[i-1]*///i不是4的倍数的时候//每个temp = 每个outkey32bit = 4字节for(x=0;x<4;x++) temp[x]=outkey[(4*(i-1))+x];    //i：32bit的首字节地址//i是4的倍数的时候if(i%Nk==0){/*字循环：循环左移1字节 RotWord()*/t=temp[0];temp[0]=temp[1];temp[1]=temp[2];temp[2]=temp[3];temp[3]=t;/*字节代换：SubWord()*/for(x=0;x<4;x++){temp[x]=sbox[temp[x]];}/*轮常量异或：Rcon[j]*/temp[0]^=Rcon[(i/Nk)-1];}//else if(Nk>6 && (i%Nk)==4) //Nk>6的算法不同，暂时用不到//{//    /*SubWord*///   for(x=0;x<4;x++)//    {//     temp[x]=sbox[temp[x]];//   }//}/*w[i] = w[i-4]^w[i-1]*/for(x=0;x<4;x++){outkey[(4*i)+x]=outkey[(4*(i-Nk))+x]^temp[x];}++i;}
}
int main(void){/*pt：原文16字节-->密文key：原密钥16字节skey：密钥扩展44longsbox：s盒*/unsigned char pt[17],key[17];unsigned char expansionkey[15*16];int i;int j;printf("please input plaintext\n");//输入无格式的字符串字符个数不得少于六个！！！！尽量用不同的数字或字母scanf("%s",pt);printf("please input key\n");//输入加密钥匙密匙个数不得低于六个！！！！尽量用不同的数字或字母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: "); //输出密码文件for (i = 0; i < 16; i++){printf("%02x ", pt[i]);}printf("\n");printf("\n");/*解密*/Contrary_AesEncrypt(pt,expansionkey,10);//AES 解密printf("after Contrary_AesEncrypt,plaintext is: ");//将解密文件输出for (i = 0; i < 16; i++){printf("%c ", pt[i]);}printf("\n");printf("\n");while(1);return 0;
}

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