AES密码算法

//此算法，是以密钥128位为例，输入输出都是十六进制。

//测试数据：
//明文：32 43 F6 A8  88  5A  30  8D  31  31  98  A2   E0 37  07  34
//密钥：2b 7e 15 16  28  ae  d2   a6  ab   f7  15  88   09  cf   4f    3c
//密文：39 25 84 1D 02  DC 09   FB  DC 11  85  97  19  6A  0B  32

#include<stdio.h>
int M[4][4],a[4][4];  // M --> 明文，密文  a --> 初始密钥
unsigned char S_box[] =
	{ /*  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*/
	};
int c[4][4]={
			 0x02,0x03,0x01,0x01,
			 0x01,0x02,0x03,0x01,
			 0x01,0x01,0x02,0x03,
			 0x03,0x01,0x01,0x02
			};
int Rc[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};
int key[11][4][4];//存放10次密钥+1次初试

//  输出函数
void Print(int t[][4])
{
	int i,j;
	for(i=0;i<4;i++,printf("\n"))
		for(j=0;j<4;j++)
			printf("\t%02x",t[i][j]);
}
//S盒
void S_Box()
{
	int i,j;	
	for(i=0;i<4;i++)
		for(j=0;j<4;j++)
			M[i][j]=S_box[M[i][j]];

	printf("\nS盒：\n");
	Print(M); //  输出函数
}
// 行移位
void Rows()
{
	int i,j,t,temp;
	for(i=1;i<4;i++)
	{
		t=i;
		// 向左移动i个字节
		while(t--)  
		{
			temp=M[i][0];  M[i][0]=M[i][1];  M[i][1]=M[i][2];  M[i][2]=M[i][3]; M[i][3]=temp;
		}
	}
	printf("\n行移位：\n");
	Print(M); //  输出函数
}
// 列混淆
int Col_M(int a,int c)  //乘法运算
{
	int t=0;

	if(c==0x03)   // 03=(02+01)  
	{
		t=(0x02*a) ^ a;  // 03*a=(02+01)*a --->02*a ^ a 这里的加法运算是异或
	}
	else t=c*a;

	if(t & 0x100 )  // 如果超过8位
	{
		t=t & 0x0ff; // 删除最高位(将第9位置0)
		t=t ^ 0x1b;  // 与0x1b异或
	}

	return t;
}
void Column()   
{
	int i,j,t[4];
	for(i=0;i<4;i++)
	{
		for(j=0;j<4;j++)   // 取得一列的值
			t[j]=M[j][i];

		for(j=0;j<4;j++)
		{
			M[j][i]=Col_M(t[0],c[j][0]) ^ Col_M(t[1],c[j][1]) ^ Col_M(t[2],c[j][2]) ^ Col_M(t[3],c[j][3]);
		}
	}
	printf("\n列混淆：\n");
	Print(M); //  输出函数
}

// 轮密钥加
void Key_Plus(int t)
{
	int i,j;
	for(i=0;i<4;i++)
		for(j=0;j<4;j++)
			M[i][j]=M[i][j]^key[t][i][j];
	
	printf("\n轮密钥加：\n");
	Print(M); //  输出函数
}
// 子密钥
void Key()
{
	int i,j,r;
    for(i=0;i<4;i++)//存放初试密钥
        for(j=0;j<4;j++)
            key[0][i][j]=a[i][j];


    for(i=1;i<=10;i++)//十轮密钥加变换
    {
		for(j=0;j<=3;j++)
		{
			int k[4];
			for(r=0; r<4; r++)
				k[r] = j ? key[i][r][j-1] : key[i-1][r][3];
            //当j为0，表示选择上一轮最后一列
			if(j==0)
			{
				int t=k[0];//左移一位
				for(r=1;r<=3;r++)
                    k[r-1]=k[r];
                    k[3]=t;

				for(r=0; r<=3; r++)
				{
					k[r]=S_box[k[r]];//S盒置换
				}
				k[0]^=Rc[i-1];//异或RC
			}

			for(r=0; r<4; r++)
				key[i][r][j]=key[i-1][r][j]^k[r];//异或上一轮对应的
		}
    }
}

// AES加密算法实现
void AES_jiami()
{
	int i,r,c;
	Key();       // 子密钥
	Key_Plus(0);   // 轮密钥加变换

	for(i=1;i<11;i++)
	{
		printf("\n--------------------第%d轮--------------------",i);
        printf("\n子密钥：\n");
		for(r=0;r<4;r++,printf("\n"))
		{
			for(c=0;c<4;c++)
				printf("\t%02x",key[i][r][c]);
		}

		S_Box();		     // S盒变换
		Rows();			     // 行移位变换
		if(i!=10) // 第10次不用
			Column();		     // 列混淆变换
		Key_Plus(i);		     // 轮密钥加变换
	}
}
// 行列置换
void Row_Col(int a[][4],int b[][4])
{
	int i,j;
	for(i=0;i<4;i++)
		for(j=0;j<4;j++)
			a[j][i]=b[i][j];
}
void main()
{
	int i,j;
	int m[4][4]={  //  明文
				0x32, 0x43, 0xf6, 0xa8, 
				0x88, 0x5a, 0x30, 0x8d, 
				0x31, 0x31, 0x98, 0xa2, 
				0xe0, 0x37, 0x07, 0x34},
		b[4][4]={  //  密钥
				0x2b, 0x7e, 0x15, 0x16, 
				0x28, 0xae, 0xd2, 0xa6, 
				0xab, 0xf7, 0x15, 0x88, 
				0x09, 0xcf, 0x4f, 0x3c};

	// 输入明文
	printf("请输入明文(16进制，16个字节):\n");
	for(i=0;i<4;i++)
		for(j=0;j<4;j++)
			scanf("%x",&m[i][j]);

	// 输入密钥
	printf("请输入密钥(16进制，16个字节):\n");
	for(i=0;i<4;i++)
		for(j=0;j<4;j++)
			scanf("%x",&b[i][j]);
	
	// 明文，密钥进行行列置换
	Row_Col(M,m);
	Row_Col(a,b);
		
	printf("输出置换后的明文:\n");
	    Print(M);

	printf("\n输出置换后的密钥:\n");
		Print(a);

	// 加密
	AES_jiami();
	
	// 进行行列置换
	Row_Col(m,M);

	for(i=0;i<4;i++)
		for(j=0;j<4;j++)
			M[i][j]=m[i][j];

	// 输出密文
	printf("\n\n--------------------密文:--------------------\n");
	Print(M);
	printf("\n");
}