- <?php
- /**
- * 精简版加密/解密类
- */
- class SimpleCrypt{
- /**
- * 密钥
- * 越复杂越好,但字符串长度会整加
- * @var String
- */
- private static $key = 'jdkhvxdicstui';
- /**
- * 用于生成随机字符串
- * @var array
- */
- private static $word = array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','v','u','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','V','U','W','X','Y','Z');
- /**
- * 加密算法
- * @param $str 需要加密的字符串
- * @return String 加密后的字符串
- */
- public static function encode($str){
- //首次加密
- $str = base64_encode($str);
- //计算字符串长度
- $str_num = mb_strlen($str);
- //取一半长度
- $half = ceil($str_num / 2);
- //获取前半和后半字符串
- $head_str = substr($str , 0 , $half);
- $end_str = substr($str , $half , $str_num);
- //计算前半和后半加密次数
- $head_loop_num = $half < 50 ? ceil($half / 5) : ceil($half / 10);
- $end_loop_num = $str_num > 200 ? ceil($str_num / 10) : ceil($str_num /8);
- //生成随机字符串
- $head_rand_loop_num = ($head_loop_num * 10) - $head_loop_num;
- $end_rand_loop_num = ($end_loop_num + $head_loop_num) * 10 - $end_loop_num;
- $head_rand_str = null;
- $end_rand_str = null;
- //前半部分随机字符串
- for($i = 0 ; $i < $head_rand_loop_num ; $i++){
- $head_rand_str .= self::$word[rand(0 , 51) ];
- }
- //后半部分随机字符串
- for($i = 0 ; $i < $end_rand_loop_num ; $i++){
- $end_rand_str .= self::$word[rand(0 , 51)];
- }
- //前半部分内容加密
- for($i = 0 ; $i < $head_loop_num ; $i++){
- $head_str = base64_encode($head_str);
- }
- //撕毁变量
- unset($i);
- //后半部分内容加密
- for($i = 0 ; $i < $end_loop_num ; $i++){
- $end_str = base64_encode($end_str);
- }
- //合并
- $implode_str = $head_rand_str . $head_str . self::$key . base64_encode($head_loop_num) . self::$key . base64_encode($end_loop_num) . self::$key . $end_str . $end_rand_str;
- $result = base64_encode($implode_str);
- //以后继续,先返回
- return $result;
- }
- /**
- * 解密算法
- * @param $str 需解密的字符串
- * @return String 解密后字符串
- */
- public static function decode($str){
- //获取加密信息
- $get = explode(self::$key , base64_decode($str));
- $head_str = $get[0];
- $end_str = $get[3];
- $head_loop_num = base64_decode($get[1]);
- $end_loop_num = base64_decode($get[2]);
- //去除随机字符串的算法
- $head_rand_num = ($head_loop_num * 10) - $head_loop_num;
- $end_rand_num = ($end_loop_num + $head_loop_num) * 10 - $end_loop_num;
- //去除随机字符串,获取原文
- $head_str = substr($head_str , $head_rand_num , strlen($head_str));
- $end_str = substr($end_str , 0 , strlen($end_str) - $end_rand_num);
- //解密前半部分
- for($i = 0 ; $i < $head_loop_num ; $i++){
- $head_str = base64_decode($head_str);
- }
- //撕毁变量
- unset($i);
- //解密后半部分
- for($i = 0 ; $i < $end_loop_num ; $i++){
- $end_str = base64_decode($end_str);
- }
- //合并并解密
- $result = base64_decode($head_str . $end_str);
- return $result;
- }
- }
- ?>
- //该片段来自于http://www.codesnippet.cn/detail/0112201411107.html
来源: http://www.codesnippet.cn/detail/0112201411107.html