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AES C语言实现
作者：数据灵魂2 | 2024-01-31 19:42:29
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aes c
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; } }
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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
}
}
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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
}
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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
}
}
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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
}
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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);
}
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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
}
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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"); }
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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"); }
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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; }
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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;
}
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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(); }
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