字符串分段加密

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/zuiaisha1/article/details/54982069

/*分段加密
1、欲加密的字符串str ，加密的密码encryptStr
2、将encryptStr 每个字符 异或  str  每个字符
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

//1、分段加密
//普通加密
void   encrypt(char *str) {
	if (str == NULL)
		return;
	for (char *p = str; *p != '\0'; p++)
	{
		*p = *p ^ 6;
	}
}
/*分段加密
1、欲加密的字符串str ，加密的密码encryptStr
2、将encryptStr 每个字符 异或  str  每个字符
*/
void subEncrypt(char * str, char * encryptStr, int strLength) {
	if (str == NULL || *str == encryptStr)
		return;

	int encryptStrLength = strlen(encryptStr);
	int remainder = strLength % encryptStrLength;
	for (int i = 0; i < strLength; i++)
	{
		str[i] = str[i] ^ encryptStr[i % encryptStrLength];//Integer division by zero。
	}
}

void main() {

	char rStr[] = "I am a Stringfghss";
	printf("原来的 ：%s", rStr);
	int strLength = strlen(rStr);
	//encrypt(&rStr);
	subEncrypt(rStr, "sdfsdfsefs", strLength);//encrypt
	printf("\n");
	printf("加密：%s", rStr);
	printf("\n");
	subEncrypt(rStr, "sdfsdfsefs", strLength);
	printf("解密：%s", rStr);
	printf("\n");

	system("pause");
}