图片加密解密程序2

图片加密解密c语言实现

#include<stdio.h>#include<stdlib.h>#include<conio.h>#include<string.h>typedef unsigned char BYTE;typedef unsigned short WORD;void ECBencrypto(char *in_fname,char   *password,char *out_fname);void CBCencrypto(char *in_fname,char   *password,char *out_fname);int main(){ char in_fname[30]; char out_fname[30]; char  password[10];printf("-------------welcome to use zsh program -------------/n"); printf("/nplease input infile name/n"); gets(in_fname); printf("/t/t请选择要加密的方式：1.EBC  2.CBC 0.退出/t/n");    char ch; ch=getchar(); while(!(ch>='0'&&ch<='2'))ch=getchar(); while(1) {  switch(ch)  {  case '1':   printf("/nplease input outfile name/n");   fflush(stdin);         gets(out_fname);   printf("/nplease input password /n");   fflush(stdin);   gets(password);   ECBencrypto(in_fname,password,out_fname);   break;  case '2':   printf("/nplease input outfile name/n");   fflush(stdin);         gets(out_fname);   printf("/nplease input password /n");   fflush(stdin);   gets(password);   CBCencrypto(in_fname,password,out_fname);   break;  case '0':   return 0;  }  printf("/t/t请选择要加密的方式：1.EBC  2.CBC 0.退出/t/n");        ch=getchar(); // fflush(stdin);  while(!(ch>='0'&&ch<='2'))ch=getchar(); } printf("end/n"); return 0;}long Getfilesize(FILE *stream){ long curpos1,curpos2,length; curpos1=ftell(stream);//测定文件当前指向 fseek(stream,0L,SEEK_END); curpos2=ftell(stream);//测定文件当前指向 length=curpos2-curpos1; fseek(stream,curpos1,SEEK_SET);//恢复文件开始位置 //printf("%ld/n",length); return length; // fclose(stream);}void ECBencrypto(char *in_fname,char   *password,char *out_fname){ FILE *fp1,*fp2; if(NULL==(fp1=fopen(in_fname,"rb")))//以只读的方式打开二进制文件 {  printf("can not open the file/n");  exit(1); } if(NULL==(fp2=fopen(out_fname,"wb")))//以只写的方式打开一个二进制文件，如果文件不存在，则创建该文件 {  printf("can not create file /n");  exit(1); } //printf("file bkwood.bmp open success./n"); WORD fileType; fread(&fileType,1,sizeof(WORD),fp1); fwrite(&fileType,1,sizeof(WORD),fp2); if(fileType != 0x4d42) {  printf("file is not .bmp file!");  return; } long length=Getfilesize(fp1); printf("此文件的大小为：%ld/n/n",length); int len=0; while(password[++len]);//获取密码长度 BYTE buf; fread(&buf,1,sizeof(buf),fp1); for(int i=0;i<50;i++) {  fwrite(&buf,1,sizeof(buf),fp2);  fread(&buf,1,sizeof(buf),fp1); } int j=0; while(!feof(fp1)) {  buf^=password[j>=len?j=0:j++];//以EBC方式加密  fwrite(&buf,1,sizeof(buf),fp2);  fread(&buf,1,sizeof(buf),fp1); } printf("do Ebc/n"); fclose(fp1); fclose(fp2); }void CBCencrypto(char *in_fname,char   *password,char *out_fname){ FILE *fp1,*fp2; if(NULL==(fp1=fopen(in_fname,"rb")))//以只读的方式打开二进制文件 {  printf("can not open the file/n");  exit(1); } if(NULL==(fp2=fopen(out_fname,"wb")))//以只写的方式打开一个二进制文件，如果文件不存在，则创建该文件 {  printf("can not create file /n");  exit(1); } //printf("file bkwood.bmp open success./n"); WORD fileType; fread(&fileType,1,sizeof(WORD),fp1); fwrite(&fileType,1,sizeof(WORD),fp2); if(fileType != 0x4d42) {  printf("file is not .bmp file!");  return; } long length=Getfilesize(fp1); printf("此文件的大小为：%ld/n/n",length); int len=0; while(password[++len]);//获取密码长度 BYTE buf; fread(&buf,1,sizeof(buf),fp1); for(int i=0;i<50;i++) {  fwrite(&buf,1,sizeof(buf),fp2);  fread(&buf,1,sizeof(buf),fp1); } int j=0; char temp;    while(!feof(fp1)) {  buf^=password[j>=len?j=0:j++];  temp=buf^=password[j>=len?j=0:j++];//以CBC方式加密  buf^=temp;  fwrite(&buf,1,sizeof(buf),fp2);  fread(&buf,1,sizeof(buf),fp1); } printf("do Cbc/n"); fclose(fp1); fclose(fp2);}