c語言文件加密代碼
對於加密要求不高的完全可以自己定義規則來進行加密。這種加密是很簡單很自由的，例如你在存文件的時候可以將文件中的每個字元都加上一個數，然後讀取該文件的時候再每個字元相應地減去那個數，即可實現就簡單的加密，這樣你儲存的文件看上去就是亂碼了。只是這個規則太簡單，規則你可以自己定，加密與解密對著來就行了。
下面程序用異或操作對文件進行加密和解密
/******************設計思路******************/
//根據用戶輸入的加密/機密密碼，
//每次都拿原文件和密碼等長度的一個字元串和密碼
//對應元素異或進行加密/解密
//另外因為是用異或方法，所以加密和解密就是同一個程序
//即按照同樣的加密即是對文件的解密
#include
#include
#include
#include
#include
charfilename[256];//原文件
charpassword[256];//加密/解密密碼
constcharfilenametemp[]="temp15435255435325432543.temp";//加密/解密中間文件
voidinputpass(char*pass);//密碼輸入以"******"顯示
voidmain(){
FILE*fp;//加密/解密的文件
FILE*fptemp;//加密/解密過程臨時文件
intpwdlen;//密碼長度
inti=0;//計數器
charch=0;//讀入的字元
printf("請輸入要加密/解密的文件名(全路徑名):\n");
gets(filename);
if((fp=fopen(filename,"rb"))==NULL){
printf("找不到文件%s\n",filename);
exit(1);
}//if
printf("請輸入要加密/解密的密碼:\n");
inputpass(password);
pwdlen=strlen(password);
if(pwdlen==0){
printf("密碼不能為空，加密/解密失敗\n");
exit(1);
}//if
fptemp=fopen(filenametemp,"wb");//打開中間文件
while(1){
ch=fgetc(fp);//從原文件讀入一個字元
if(feof(fp)){//已經讀到文件尾
break;//退出循環
}
ch^=password[i++];//對原字元和密碼進行異或操作
fputc(ch,fptemp);//將異或結果寫入中間文件
if(i==pwdlen){//使得原文件每和密碼長度相同的固定長度異或加密
i=0;
}
}//while
fclose(fp);//關閉打開原文件
fclose(fptemp);//關閉打開中間文件
remove(filename);//刪除原文件
rename(filenametemp,filename);//將中間文件重命名為原文件
printf("加密/解密成功\n");//至此加密/解密成功
}
//密碼輸入以"******"顯示
voidinputpass(char*pass){
inti=0;
charc;
while(isprint(c=getch())){
pass[i++]=c;
//printf("*");
}
pass[i]='\0'
printf("\n");
}
B. C語言編寫文件加密程序
#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靚";
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("不能打開文件。 ");
return1;
}
while(fread(&ch,1,1,infile)==1){
c=DigitNot(ch);
fwrite(&c,1,1,outfile);
}
fclose(infile);
fclose(outfile);
return0;
}
C. c語言中的文件加密
//自己寫的加密，加密方法就是根據輸入的密碼對文件中的內容進行異或後存放在加密後的文件中
//轉載請聲明program by STU caige
#include<stdio.h>
#include<stdlib.h>
#include <conio.h>//getche()需要
#include<string.h>
char ch;
//異或函數
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;//異或後移動的次數 ;
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();//讀入一個鍵盤碼
}
while ((key!='1')&&(key!='2')&&(key!=27));
Password[50]=0;
passwordnum=0;
if (key==49)
{
system("cls");
printf("請輸入要加密的文件絕對路徑\n");
scanf("%s",fname0);
// while(key=0)
//打開原文件
if ((f0=fopen(fname0,"rb"))==NULL)
{
printf("文件打不開哦！\n");
key=0;//文件打開失敗時key的值改變
exit(0);
printf("加密失敗\n");
system("pause");
}
//只有文件fname0打開成功時才能繼續打開efname
if(key==49)
{
system("cls");
printf("請輸入完成加密的文件存儲路徑\n");
scanf("%s",efname);
if ((fe=fopen(efname,"w+"))==NULL)
{
printf("文件打不開哦！\n");
printf("加密失敗\n");
fclose(f0);
system("pause");
exit(0);
key=0;
}
}
//如果打開文件成功則開始輸入密碼
if(key==49)
{
system("cls");
printf("請輸入密碼\n");
scanf("%s",Password);
//把字元密碼轉化為整形來異或
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)
{//異或加密
system("cls");
YiHuo(f0,fe,passwordnum,move,key);
printf("\n加密成功，您的輸出文件路徑為:\n");
printf("%s",efname);
fclose(f0);
fclose(fe);
}
}
if (key==50)
{
system("cls");
printf("請輸入要解密的文件絕對路徑\n");
scanf("%s",fname0);
// while(key=0)
//打開原文件
if ((f0=fopen(fname0,"rb"))==NULL)
{
printf("文件打不開哦！\n");
key=0;//文件打開失敗時key的值改變
exit(0);
printf("解密失敗\n");
system("pause");
}
//只有文件fname0打開成功時才能繼續打開dfname
if(key==50)
{
system("cls");
printf("請輸入完成解密的文件存儲路徑\n");
scanf("%s",dfname);
if ((fd=fopen(dfname,"w+"))==NULL)
{
printf("解密失敗");
fclose(f0);
system("pause");
printf("文件打不開哦！\n");
exit(0);
key=0;
}
}
//如果打開文件成功則開始輸入密碼
if(key==50)
{
system("cls");
printf("請輸入密碼\n");
scanf("%s",Password);
//把字元密碼轉化為整形來異或
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)
{//異或加密
system("cls");
YiHuo(f0,fd,passwordnum,move,key);
printf("\n解密成功，您的輸出文件路徑為:\n%S",dfname);
system("pause");
fclose(f0);
fclose(fd);
}
}
}
while(key!=27);//當key為0，即讀寫兩個文件都打開成功時才結束循環
return 0;
printf("\n謝謝使用!，program by STU caige\n");
system("pause");
}
D. 求用c語言寫的文件加密解密代碼
/*給文件加密的技術很多,其中又分為不同等級,以適合不同場合的需要.
這里給出最簡單的文件加密技術,即採用文件逐位元組與密碼異或橋肢方式對
文件進行加密,當解密時,只需再運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);/*對文件進行加密的具體函數*/
void main(int argc,char *argv[])/*定義main()函數的命令行參數*/
{
char in_fname[30];/*用戶輸入的要加密的文件名*/
char out_fname[30];
char pwd[8];/*用來保存密碼*/
if(argc!=4)
{/*容錯處理*/
printf("\nIn-fname:\嘩消舉n");
gets(in_fname);/*得到要加密的文件名*/
printf("Password:\n");
gets(pwd);/*得到密碼*/
printf("Out-file:\n");
gets(out_fname);/*得到加密後你要的文件名*/
dofile(in_fname,pwd,out_fname);
}
else
{/*如果命令行參數正確,便直接運行程序*/
strcpy(in_fname,argv[1]);
strcpy(pwd,argv[2]);
strcpy(out_fname,argv[3]);
dofile(in_fname,pwd,out_fname);
}
}
/*加密子函數開始*/
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); /*如果不能打開要加密的文件,便退出程序*/
}
fp2=fopen(out_file,"wb");
if(fp2==NULL)
{
printf("cannot open or create out-file.\n");
exit(1); /*如果不能建立加密後的文件,便退出*/
}
while(pwd[++j0]);
ch=fgetc(fp1);
/*加密演算法開始*/
while(!feof(fp1))
{
fputc(ch^pwd[j>=j0?j=0:j++],fp2);/*異或後寫入fp2文件*/
ch=fgetc(fp1); /*把密碼重復寫到fp2中,而不是
只寫一次*/
}
fclose(fp1);/*關閉源文件*/
fclose(fp2);/*關閉目亂碧標文件*/
getch();
}
/*程序結束*/
E. C語言設計一個簡單的加密解密程序
C語言設計一個簡單的加密解密程序如下：
加密程序代碼：
#include<stdio.h>
main()
{
char
c,filename[20];
FILE
*fp1,*fp2;
printf("請輸入待加密的文件名:\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);
}
解密程序代碼：
#include<stdio.h>
#include<string.h>
main()
{
char
c,filename[20];
char
yanzhengma[20];
FILE
*fp1,*fp2;
printf("請輸入待解密文件名:\n");
scanf("%s",filename);
printf("請輸入驗證碼:\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("驗證碼錯誤！請重新輸入:\n");
scanf("%s",filename);
}
}
F. 用C語言給文件加密解密，詳細簡單的代碼；；；；用c打開一txt文件，怎麼寫【新手初學】
#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); //如果逗啟不能打開要加密的文件，便退出程序、
}
fp2=fopen(out_file,"wb");
if(fp2==NULL)
{
printf("cannot open or create out-file.\n");
exit(1); //如果不能建立加密後的文件，便退出
}
while(pwd[++j0]);
ch=fgetc(fp1); //加密演算法開始
while(!feof(fp1))
{
fputc(ch^pwd[j>j0?j=0:j++],fp2); //異或後寫山指如入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. 關於用C語言對文件進行加密和解密
ch=ch^*(pwd+i); //對讀取的一個字元，進行異或
重點是這，，，，，，就是使用密碼，對源文件逐byte異或、
if(i>9){
i=0;
}
密碼也循環使用。
~~~~~~~~~~~~
H. c語言編寫加密程序
#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語言代碼 要完整代碼 能運行的
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
voidfindKey(char*談告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("輸入密鑰:");
scanf("%s",key);
findKey(key,mark);
printf("得到密鑰:%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("映射關系:%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("讀取明文:%s ",encrypt);
for(i=0;i<舉悄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語言英文文本加密
#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())!=' ')//為文件輸入內容
fputc(t,fp);
printf("Please enter the encryption key(int >0)... k=");
while(scanf("%d",&k)!=1 || k<1){//輸入加密密鑰並判斷是否正確
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);//關閉原文件
fclose(fq);//關閉加密後的文件
remove("AAA12345678901.txt");//刪除原文件
rename("tmp.txt","AAA12345678901.txt");//將加密後的文件更換為原文件名
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;
}
代碼格式和運行樣例圖片：