c语言文件加密代码
对于加密要求不高的完全可以自己定义规则来进行加密。这种加密是很简单很自由的，例如你在存文件的时候可以将文件中的每个字符都加上一个数，然后读取该文件的时候再每个字符相应地减去那个数，即可实现就简单的加密，这样你储存的文件看上去就是乱码了。只是这个规则太简单，规则你可以自己定，加密与解密对着来就行了。
下面程序用异或操作对文件进行加密和解密
/******************设计思路******************/
//根据用户输入的加密/机密密码，
//每次都拿原文件和密码等长度的一个字符串和密码
//对应元素异或进行加密/解密
//另外因为是用异或方法，所以加密和解密就是同一个程序
//即按照同样的加密即是对文件的解密
#include
#include
#include
#include
#include
charfilename[256];//原文件
charpassword[256];//加密/解密密码
constcharfilenametemp[]="temp15435255435325432543.temp";//加密/解密中间文件
voidinputpass(char*pass);//密码输入以"******"显示
voidmain(){
FILE*fp;//加密/解密的文件
FILE*fptemp;//加密/解密过程临时文件
intpwdlen;//密码长度
inti=0;//计数器
charch=0;//读入的字符
printf("请输入要加密/解密的文件名(全路径名):\n");
gets(filename);
if((fp=fopen(filename,"rb"))==NULL){
printf("找不到文件%s\n",filename);
exit(1);
}//if
printf("请输入要加密/解密的密码:\n");
inputpass(password);
pwdlen=strlen(password);
if(pwdlen==0){
printf("密码不能为空，加密/解密失败\n");
exit(1);
}//if
fptemp=fopen(filenametemp,"wb");//打开中间文件
while(1){
ch=fgetc(fp);//从原文件读入一个字符
if(feof(fp)){//已经读到文件尾
break;//退出循环
}
ch^=password[i++];//对原字符和密码进行异或操作
fputc(ch,fptemp);//将异或结果写入中间文件
if(i==pwdlen){//使得原文件每和密码长度相同的固定长度异或加密
i=0;
}
}//while
fclose(fp);//关闭打开原文件
fclose(fptemp);//关闭打开中间文件
remove(filename);//删除原文件
rename(filenametemp,filename);//将中间文件重命名为原文件
printf("加密/解密成功\n");//至此加密/解密成功
}
//密码输入以"******"显示
voidinputpass(char*pass){
inti=0;
charc;
while(isprint(c=getch())){
pass[i++]=c;
//printf("*");
}
pass[i]='\0'
printf("\n");
}
B. C语言编写文件加密程序
#include<stdio.h>
charDigitNot(charch){
charc=0,t;
inti;
for(i=0;i<8;++i){
t=ch&(1<<(7-i));
if(t)continue;
c=((c>>(7-i))+1)<<(7-i);
}
returnc;
}
char*StrNot(char*sourstr,char*deststr){
inti;
for(i=0;sourstr[i];++i)
deststr[i]=DigitNot(sourstr[i]);
deststr[i]=0;
returndeststr;
}
intmain(){
FILE*infile,*outfile;
charch,c,str1[]="012aboc靓";
charstr2[10];
printf("%s<==>%s ",str1,StrNot(str1,str2));//加密
printf("%s<==>%s ",str2,StrNot(str2,str1));//解密
infile=fopen("su","rb");
outfile=fopen("sum","wb");
if(infile==NULL||outfile==NULL){
printf("不能打开文件。 ");
return1;
}
while(fread(&ch,1,1,infile)==1){
c=DigitNot(ch);
fwrite(&c,1,1,outfile);
}
fclose(infile);
fclose(outfile);
return0;
}
C. c语言中的文件加密
//自己写的加密，加密方法就是根据输入的密码对文件中的内容进行异或后存放在加密后的文件中
//转载请声明program by STU caige
#include<stdio.h>
#include<stdlib.h>
#include <conio.h>//getche()需要
#include<string.h>
char ch;
//异或函数
int YiHuo(FILE *f0,FILE *fp,int passwordnum,int move,char key)
{
while(fread(&ch,1,1,f0),!feof(f0))
{
if (key==49)//加密
{
ch=ch+move;
(char)(ch^=passwordnum);
fwrite(&ch,1,1,fp);
}
if (key==50)//解密
{
(char)(ch^=passwordnum);
ch=ch+move;
fwrite(&ch,1,1,fp);
}
}
}
int main()
{
//encrypt加密 decrypt解密
FILE *f0,*fe,*fd;
char fname0[50];
char efname[50]={0};
char dfname[50]={0};
char Password[50]={0},key=0,key2=0;
char sysfname[20]={0};
int p=0,passwordnum,move=0;//异或后移动的次数 ;
system("cls");
do
{
system("cls");
do
{
printf("1-----------加密文件\n");
printf("2-----------解密文件\n");
printf("Esc----------退出\n") ;
key=getch();//读入一个键盘码
}
while ((key!='1')&&(key!='2')&&(key!=27));
Password[50]=0;
passwordnum=0;
if (key==49)
{
system("cls");
printf("请输入要加密的文件绝对路径\n");
scanf("%s",fname0);
// while(key=0)
//打开原文件
if ((f0=fopen(fname0,"rb"))==NULL)
{
printf("文件打不开哦！\n");
key=0;//文件打开失败时key的值改变
exit(0);
printf("加密失败\n");
system("pause");
}
//只有文件fname0打开成功时才能继续打开efname
if(key==49)
{
system("cls");
printf("请输入完成加密的文件存储路径\n");
scanf("%s",efname);
if ((fe=fopen(efname,"w+"))==NULL)
{
printf("文件打不开哦！\n");
printf("加密失败\n");
fclose(f0);
system("pause");
exit(0);
key=0;
}
}
//如果打开文件成功则开始输入密码
if(key==49)
{
system("cls");
printf("请输入密码\n");
scanf("%s",Password);
//把字符密码转化为整形来异或
for(p=0;Password[p]!=0;p++)
passwordnum+=((int)Password[p]);
move=(int)(passwordnum%9);
while (move>9)
move=(int)(move%9);
printf("%d",move);system("pause");
}
if (key==49)
{//异或加密
system("cls");
YiHuo(f0,fe,passwordnum,move,key);
printf("\n加密成功，您的输出文件路径为:\n");
printf("%s",efname);
fclose(f0);
fclose(fe);
}
}
if (key==50)
{
system("cls");
printf("请输入要解密的文件绝对路径\n");
scanf("%s",fname0);
// while(key=0)
//打开原文件
if ((f0=fopen(fname0,"rb"))==NULL)
{
printf("文件打不开哦！\n");
key=0;//文件打开失败时key的值改变
exit(0);
printf("解密失败\n");
system("pause");
}
//只有文件fname0打开成功时才能继续打开dfname
if(key==50)
{
system("cls");
printf("请输入完成解密的文件存储路径\n");
scanf("%s",dfname);
if ((fd=fopen(dfname,"w+"))==NULL)
{
printf("解密失败");
fclose(f0);
system("pause");
printf("文件打不开哦！\n");
exit(0);
key=0;
}
}
//如果打开文件成功则开始输入密码
if(key==50)
{
system("cls");
printf("请输入密码\n");
scanf("%s",Password);
//把字符密码转化为整形来异或
for(p=0;Password[p]!=0;p++)
passwordnum+=((int)Password[p]);
move=(int)(passwordnum%9);
while (move>9)
move=(int)(move%9);
move=(-move);
}
if (key==50)
{//异或加密
system("cls");
YiHuo(f0,fd,passwordnum,move,key);
printf("\n解密成功，您的输出文件路径为:\n%S",dfname);
system("pause");
fclose(f0);
fclose(fd);
}
}
}
while(key!=27);//当key为0，即读写两个文件都打开成功时才结束循环
return 0;
printf("\n谢谢使用!，program by STU caige\n");
system("pause");
}
D. 求用c语言写的文件加密解密代码
/*给文件加密的技术很多,其中又分为不同等级,以适合不同场合的需要.
这里给出最简单的文件加密技术,即采用文件逐字节与密码异或桥肢方式对
文件进行加密,当解密时,只需再运行一遍加密程序即可.
*/
#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#include<string.h>
void dofile(char *in_fname,char *pwd,char *out_fname);/*对文件进行加密的具体函数*/
void main(int argc,char *argv[])/*定义main()函数的命令行参数*/
{
char in_fname[30];/*用户输入的要加密的文件名*/
char out_fname[30];
char pwd[8];/*用来保存密码*/
if(argc!=4)
{/*容错处理*/
printf("\nIn-fname:\哗消举n");
gets(in_fname);/*得到要加密的文件名*/
printf("Password:\n");
gets(pwd);/*得到密码*/
printf("Out-file:\n");
gets(out_fname);/*得到加密后你要的文件名*/
dofile(in_fname,pwd,out_fname);
}
else
{/*如果命令行参数正确,便直接运行程序*/
strcpy(in_fname,argv[1]);
strcpy(pwd,argv[2]);
strcpy(out_fname,argv[3]);
dofile(in_fname,pwd,out_fname);
}
}
/*加密子函数开始*/
void dofile(char *in_fname,char *pwd,char *out_file)
{
FILE *fp1,*fp2;
register char ch;
int j=0;
int j0=0;
fp1=fopen(in_fname,"rb");
if(fp1==NULL)
{
printf("cannot open in-file.\n");
exit(1); /*如果不能打开要加密的文件,便退出程序*/
}
fp2=fopen(out_file,"wb");
if(fp2==NULL)
{
printf("cannot open or create out-file.\n");
exit(1); /*如果不能建立加密后的文件,便退出*/
}
while(pwd[++j0]);
ch=fgetc(fp1);
/*加密算法开始*/
while(!feof(fp1))
{
fputc(ch^pwd[j>=j0?j=0:j++],fp2);/*异或后写入fp2文件*/
ch=fgetc(fp1); /*把密码重复写到fp2中,而不是
只写一次*/
}
fclose(fp1);/*关闭源文件*/
fclose(fp2);/*关闭目乱碧标文件*/
getch();
}
/*程序结束*/
E. C语言设计一个简单的加密解密程序
C语言设计一个简单的加密解密程序如下：
加密程序代码：
#include<stdio.h>
main()
{
char
c,filename[20];
FILE
*fp1,*fp2;
printf("请输入待加密的文件名:\n");
scanf("%s",filename);
fp1=fopen(filename,"r");
fp2=fopen("miwen.txt","w");
do
{
c=fgetc(fp1);
if(c>=32&&c<=126)
{
c=c-32;
c=126-c;
}
if(c!=-1)
fprintf(fp2,"%c",c);
}
while(c!=-1);
}
解密程序代码：
#include<stdio.h>
#include<string.h>
main()
{
char
c,filename[20];
char
yanzhengma[20];
FILE
*fp1,*fp2;
printf("请输入待解密文件名:\n");
scanf("%s",filename);
printf("请输入验证码:\n");
scanf("%s",yanzhengma);
if(strcmp(yanzhengma,"shan")==0)
{
fp1=fopen(filename,"r");
fp2=fopen("yuanwen.txt","w");
do
{
c=fgetc(fp1);
if(c>=32&&c<=126)
{
c=126-c;
c=32+c;
}
if(c!=-1)
fprintf(fp2,"%c",c);
}
while(c!=-1);
}
else
{
printf("验证码错误！请重新输入:\n");
scanf("%s",filename);
}
}
F. 用C语言给文件加密解密，详细简单的代码；；；；用c打开一txt文件，怎么写【新手初学】
#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#include<string.h>
void dofile(char *in_fname,char *pwd,char out_file)
{
FILE *fp1,*fp2;
register char ch;
int j=0;
int j0=0;
fp1=fopen(in_fname,"rb");
if(fp1==NULL)
{
printf("cannot open in-file.\n");
exit(1); //如果逗启不能打开要加密的文件，便退出程序、
}
fp2=fopen(out_file,"wb");
if(fp2==NULL)
{
printf("cannot open or create out-file.\n");
exit(1); //如果不能建立加密后的文件，便退出
}
while(pwd[++j0]);
ch=fgetc(fp1); //加密算法开始
while(!feof(fp1))
{
fputc(ch^pwd[j>j0?j=0:j++],fp2); //异或后写山指如入fp2文件
ch=fgetc(fp1);
}
fclose(fp1);
fclose(fp2);
}
void main(int argc,char *argv[])
{
char in_fname[30];
char out_fname[30];
char pwd[8];
if(argc!=4)
{
printf("\nIn-fname:\n");
gets(in_fname);
printf("Password:\n");
gets(pwd);
printf("Out-file:\逗耐n");
gets(out_fname);
dofile(in_fname,pwd,out_fname);
}
else
{
strcpy(in_fname,argv[1]);
strcpy(pwd,argv[2]);
strcpy(out_fname,argv[3]);
dofile(in_fname,pwd,out_fname);
}
}
G. 关于用C语言对文件进行加密和解密
ch=ch^*(pwd+i); //对读取的一个字符，进行异或
重点是这，，，，，，就是使用密码，对源文件逐byte异或、
if(i>9){
i=0;
}
密码也循环使用。
~~~~~~~~~~~~
H. c语言编写加密程序
#include <stdio.h>
#include <string.h>
#include "global.h"
#include "md5.h"
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21
static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char
[64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned
int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
static unsigned char PADDING[64] = {
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
#define FF(a, b, c, d, x, s, ac) { (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b);}
#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
void MD5Init (context)
MD5_CTX *context;
{
context->count[0] = context->count[1] = 0;
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
void MD5Update (context, input, inputLen)
MD5_CTX *context;
unsigned char *input;
unsigned int inputLen;
{
unsigned int i, index, partLen;
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
if ((context->count[0] += ((UINT4)inputLen << 3))< ((UINT4)inputLen << 3))
context->count[1]++;
context->count[1] += ((UINT4)inputLen >> 29);
partLen = 64 - index;
if (inputLen >= partLen)
{
MD5_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
MD5Transform (context->state, context->buffer);
for (i = partLen; i + 63 < inputLen; i += 64)
MD5Transform (context->state, &input[i]);
index = 0;
}
else
i = 0;
MD5_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i],inputLen-i);
}
void MD5Final (digest, context)
unsigned char digest[16];
MD5_CTX *context;
{
unsigned char bits[8];
unsigned int index, padLen;
Encode (bits, context->count, 8);
index = (unsigned int)((context->count[0] >> 3) & 0x3f);
padLen = (index < 56) ? (56 - index) : (120 - index);
MD5Update (context, PADDING, padLen);
MD5Update (context, bits, 8);
Encode (digest, context->state, 16);
MD5_memset ((POINTER)context, 0, sizeof (*context));
}
static void MD5Transform (UINT4 state[4], unsigned char block[64])
{
UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
Decode (x, block, 64);
FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
/* Round 2 */
GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
/* Round 3 */
HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
/* Round 4 */
II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
MD5_memset ((POINTER)x, 0, sizeof (x));
}
static void Encode (output, input, len)
unsigned char *output;
UINT4 *input;
unsigned int len;
{
unsigned int i, j;
for (i = 0, j = 0; j < len; i++, j += 4)
{
output[j] = (unsigned char)(input[i] & 0xff);
output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
}
}
static void Decode (output, input, len)
UINT4 *output;
unsigned char *input;
unsigned int len;
{
unsigned int i, j;
for (i = 0, j = 0; j < len; i++, j += 4)
output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |(((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
}
static void MD5_memcpy (output, input, len)
POINTER output;
POINTER input;
unsigned int len;
{
unsigned int i;
for (i = 0; i < len; i++)
output[i] = input[i];
}
static void MD5_memset (output, value, len)
POINTER output;
int value;
unsigned int len;
{
unsigned int i;
for (i = 0; i < len; i++)
((char *)output)[i] = (char)value;
}
#ifndef MD
#define MD 5
#endif
#define TEST_BLOCK_LEN 1000
#define TEST_BLOCK_COUNT 1000
static void MDString PROTO_LIST ((char *));
static void MDPrint PROTO_LIST ((unsigned char [16]));
#define MD_CTX MD5_CTX
#define MDInit MD5Init
#define MDUpdate MD5Update
#define MDFinal MD5Final
int main (int argc, char *argv[])
{
int i;
if (argc > 1)
{ MDString(argv[1]);
return (0);
}
}
static void MDString (char *string)
{
MD_CTX context;
unsigned char digest[16];
unsigned int len = strlen (string);
MDInit (&context);
MDUpdate (&context, string, len);
MDFinal (digest, &context);
printf ("MD%d (\"%s\") = ", MD, string);
MDPrint (digest);
printf ("\n");
}
static void MDPrint (unsigned char digest[16])
{
unsigned int i;
for (i = 0; i < 16; i++)
printf ("%02x", digest[i]);
}
I. 加密文件 c语言代码 要完整代码 能运行的
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
voidfindKey(char*谈告key,char*mark){
intlen=strlen(key);
inti=0;
intj=0;
memset(mark,0,26);
for(i=0;i<len;i++)
if(mark[key[i]-97]==0){
mark[key[i]-97]=1;
key[j]=key[i];
j++;
}
key[j]=' ';
for(i=0,j=0;i<26;i++)
if(mark[i]==0){
mark[j]=97+i;
j++;
}
mark[j]=' ';
}
intmain(){
char*encrypt;
charmap[27];
charkey[100];
charmark[26];
intlen;
intmarkLen;
inti;
intnFileLen;
FILE*inputFile;
FILE*outputFile;
printf("输入密钥:");
scanf("%s",key);
findKey(key,mark);
printf("得到密钥:%s ",key);
len=strlen(key);
strcpy(map,key);
markLen=strlen(mark);
for(i=len;i<26;i++)正侍渣map[i]=mark[markLen+len-1-i];
map[26]=' ';
printf("映射关系:%s ",map);
inputFile=fopen("encrypt.txt","r");
if(inputFile==NULL){
printf("encrypt.txt不存在 ");
return1;
}
fseek(inputFile,0,SEEK_END);
nFileLen=ftell(inputFile);
encrypt=(char*)malloc(nFileLen+1);
fseek(inputFile,0,SEEK_SET);
fread(encrypt,nFileLen,1,inputFile);
encrypt[nFileLen]=' ';
printf("读取明文:%s ",encrypt);
for(i=0;i<举悄nFileLen;i++){
if(encrypt[i]<123&&encrypt[i]>96){
encrypt[i]=map[encrypt[i]-97];
}
}
outputFile=fopen("output.txt","w+");
fwrite(encrypt,nFileLen,1,outputFile);
printf("加密的密文:%s ",encrypt);
fclose(outputFile);
fclose(inputFile);
free(encrypt);
system("pause");
return0;
}
J. C语言英文文本加密
#include "stdio.h"
#include <stdlib.h>
int main(int argc,char *argv[]){
FILE *fp,*fq;
int k,t;
fp=fopen("AAA12345678901.txt","w+");
if(!fp || (fq=fopen("tmp.txt","w"))==NULL){
printf("Failed to open the file and exit... ");
return 0;
}
printf("Please enter a short passage(letters+space+punctuation,'Enter' end)... ");
while((t=getchar())!=' ')//为文件输入内容
fputc(t,fp);
printf("Please enter the encryption key(int >0)... k=");
while(scanf("%d",&k)!=1 || k<1){//输入加密密钥并判断是否正确
printf("Input error, redo: ");
fflush(stdin);
}
rewind(fp);
while(t=fgetc(fp),!feof(fp))//加密
if(t>='A' && t<='Z')
fputc(((t-'A')+k)%26+'A',fq);
else if(t>='a' && t<='z')
fputc(((t-'a')+k)%26+'a',fq);
else
fputc(t,fq);
fclose(fp);//关闭原文件
fclose(fq);//关闭加密后的文件
remove("AAA12345678901.txt");//删除原文件
rename("tmp.txt","AAA12345678901.txt");//将加密后的文件更换为原文件名
printf(" ");
if(fp=fopen("AAA12345678901.txt","r")){
while((t=fgetc(fp))!=EOF)
printf("%c",t);
printf(" Encryption success! ");
}
else
printf(" Failed to open the encrypted file... ");
fclose(fp);
return 0;
}
代码格式和运行样例图片：