按位异或实现加密解密代码,C/C++代码库,德仔网

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【C/C++】按位异或实现加密解密

作者:东昌 / 发布于2016/6/27/ 621

本例实现最简单的加密解密方式，即使用按位异或。

#pragma once
#pragma once
//Program heads:
#pragma once
#include<stdio.h>
#include<stdlib.h>
#include<vector>
#include<time.h>
#include "Decryption.h"
 
using namespace std;
 
//Variable definitions:
FILE *originalText, *toyoud; //To you is the filePtr points to where encrypted information stores.
 
int write_original_info(char bit)
{
    //Needs modification: To toyou after the debug finishes!
    if ((originalText = fopen("Plain Text.txt", "a")) != NULL)
    {
        fprintf(originalText, "%c", (char)bit);
        fclose(originalText);
        return 1;
    }
    else
    {
        printf("Error 03!\n");
        return 0;
    }
}//end function: Write the encypted information
 
void dealBits(char key, char bit)
{
    bit = bit ^ key;
    write_original_info(bit);
}//end function: Do mask operation on chars
 
void decrypt()
{
    if ((originalText = fopen("Plain Text.txt", "w")) != NULL)
        fclose(originalText);
 
    if ((toyoud = fopen("toyou", "r")) != NULL)
    {
        char key, bit;
        fscanf(toyoud, "%c%c", &key, &bit);
        while ((fscanf(toyoud, "%c%c", &key, &bit)) != EOF)
            dealBits(key, bit);
        fclose(toyoud);
    }
    else
    {
        printf("Error 01: Can't open original plaintext file!\n");
    }
}//end function: Read original message, store information into char vector.



#pragma once
//Program heads:
#pragma once
#include<stdio.h>
#include<stdlib.h>
#include<vector>
#include<time.h>
#include "Encryption.h"
 
using namespace std;
 
//Variable definitions:
FILE *message, *toyou; //To you is the filePtr points to where encrypted information stores.
 
int write_encyption_info(int key, int bit)
{
    //Needs modification: To toyou after the debug finishes!
    if ((toyou = fopen("toyou", "a")) != NULL)
    {
        //printf("%c %c\n", key, bit);
        fprintf(toyou, "%c%c", key, bit);
        fclose(toyou);
        return 1;
    }
    else
    {
        printf("Error 02: Write to encryption file fails!\n");
        return 0;
    }
}//end function: Write the encypted information
 
void dealChar(char nextChar)
{
    int random = (int)((rand() * 1.0 / RAND_MAX) * 94 + 32);
 
    //This is wrong code:
    //int random = (int)((rand() * 1.0 / RAND_MAX) * 256);
    //int digit = (((int)nextChar) ^ random);
    //digit = (((int)nextChar) ^ random);
 
    int digit = 0;
    while (digit < 32)
    {
        random = (int)((rand() * 1.0 / RAND_MAX) * 94 + 32);
        digit = (((int)nextChar) ^ random);
    }//end loop: Prevent special characters.            
 
    //printf("%d %d\n", random, digit);
    write_encyption_info(random, digit);
}//end function: Do mask operation on chars
 
int encrypt()
{
    srand(time(NULL));
    if ((toyou = fopen("toyou", "w")) != NULL)
    {
        int random = (int)((rand() * 1.0 / RAND_MAX) * 126);
        int digit = (int)((rand() * 1.0 / RAND_MAX) * 126);
        fprintf(toyou, "%c%c", (char)random, (char)digit);
        fclose(toyou);
    }//end if.
 
    if ((message = fopen("message.txt", "r")) != NULL)
    {
        char nextChar;
        while ((nextChar = fgetc(message)) != EOF)
        {
            dealChar(nextChar);
            printf("%c", nextChar);
        }
 
        fclose(message);
        return 1;
    }
 
    else
    {
        printf("Error 01: Can't open original plaintext file!\n");
        return 0;
    }
}//end function: Read original message, store information into char vector.


#include "Encryption.h"
#include "Decryption.h"
 
int main()
{
    encrypt();
    system("pause");
    decrypt();
    system("pause");
    return 0;
}

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