实验1-AES密钥扩展

密码学AES算法用程序实现

输入：
从key.txt文件中读取密钥。文件中的密钥是ASCII码，长度大于16个字符，格式为：
XXXXXXXXXXXXXXXXXXXXXXXXX
比如:abcdefg1234567890

实验内容：
把读入的数据按AES密钥扩展的要求，按密钥长度为128比特的情况进行扩展。

输出：
输出到KeyExp.txt文件的尾部，不能直接覆盖原有内容，先输出自己的学号姓名，然后是W[0]-W[3]，W[42]-W[43]，每个分组一行，十六进制表示，格式为：
（空行）
学号：XXXXXXXXX，姓名：XXX
W[X]:XXXXXXXXXXXXXXXX
W[X]:XXXXXXXXXXXXXXXX
W[X]:XXXXXXXXXXXXXXXX
W[X]:XXXXXXXXXXXXXXXX
W[X]:XXXXXXXXXXXXXXXX
W[X]:XXXXXXXXXXXXXXXX


代码如下：
#include<stdio.h>
void b_h(unsigned char from[][4],unsigned char go[][4],int num);
void y_h(unsigned char from1[][4],unsigned char from2[][4],int num1);
void main()
{
unsigned char w[44][4];
char str[]="0123456789abcdef";
unsigned char number[]="2009123074";
unsigned char T[10][4];
unsigned char name[]="张三";
int i,j;
FILE * fp;
fp=fopen("key.txt","r");//初始密钥文件
if(fp==NULL)
{
printf("cannot find file\n");
exit(0);
}
for(i=0;i<4;i++)
{
for(j=0;j<4;j++)
{
fscanf(fp,"%c",&w[i][j]);
}
}
for(i=4;i<44;i++)//密钥扩展
{

if(i%4!=0)
{
y_h(w,w,i);
}
else
{
b_h(w,T,i);
y_h(w,T,i);
}
}
fp=fopen("KeyExp.txt","a");//打开结果文件
if(fp==NULL)
{
printf("cannot find file\n");
exit(0);
}
fprintf(fp,"\n学号：%s,姓名：%s\n",number,name);
for(i=0;i<4;i++)
{
fprintf(fp,"w[%d]:",i);
for(j=0;j<4;j++)
{
fprintf(fp,"%x",w[i][j]);
}
fprintf(fp,"\n");
}
for(i=42;i<44;i++)
{
fprintf(fp,"w[%d]:",i);
for(j=0;j<4;j++)
{
fprintf(fp,"%x",w[i][j]);
}
fprintf(fp,"\n");
}
fclose(fp);
}
void b_h(unsigned char from[][4],unsigned char go[][4],int num)
{
int ch[4];
int ch2[4];
int s[16][16]={
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,

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