一个PHP针对数字的加密解密类

复制代码 代码如下:

复制代码 代码如下:

encode;* echo $e_txt.’
‘;* echo $key->decode;*/

<?php
/**
 * 加密解密类
 *
该算法仅支持加密数字。比较适用于数据库中id字段的加密解密,以及根据数字显示url的加密。
 * @author 深秋的竹子
 * @version alpha
 * @加密原则 标记长度 + 补位 + 数字替换
 * @加密步骤:
 * 将a-z,A-Z,0-9 62个字符打乱,取前M(数字最大的位数)位作为
标记长度字符串,取第M+1 到第M+10位为数字替换字符串,剩余的为补位字符串
 * 1.计算数字长度n,取乱码的第n位作为标记长度。
 * 2.计算补位的长度,加密串的长度N -1 – n
为补位的长度。根据指定的算法得到补位字符串。
 *澳门新葡亰网站注册, 3.根据数字替换字符串替换数字,得到数字加密字符串。
 * 标记长度字符 + 补位字符串 + 数字加密字符串 = 加密串
 * Usage:
 *   $obj = new XDeode(9);
 *   $e_txt = $obj->encode(123);
 *   echo $e_txt.'<br/>’;
 *   echo $key->decode($e_txt);
 */

class XDeode{ private $strbase =
“Flpvf70CsakVjqgeWUPXQxSyJizmNH6B1u3b8cAEKwTd54nRtZOMDhoG2YLrI”; private
$key,$length,$codelen,$codenums,$codeext; function __construct($length
= 9,$key = 2543.5415412812){ $this->key = $key; $this->length =
$length; $this->codelen =
substr($this->strbase,0,$this->length); $this->codenums =
substr($this->strbase,$this->length,10); $this->codeext =
substr($this->strbase,$this->length + 10); }

class XDeode{
  private $strbase =
“Flpvf70CsakVjqgeWUPXQxSyJizmNH6B1u3b8cAEKwTd54nRtZOMDhoG2YLrI”;
  private $key,$length,$codelen,$codenums,$codeext;
  function __construct($length = 9,$key = 2543.5415412812){
    $this->key = $key;
    $this->length = $length;
    $this->codelen = substr($this->strbase,0,$this->length);
    $this->codenums =
substr($this->strbase,$this->length,10);
    $this->codeext = substr($this->strbase,$this->length +
10);
  }

function encode{ $rtn = “”; $numslen = strlen;
//密文第一位标记数字的长度 $begin = substr($this->codelen,$numslen –
1,1);

  function encode($nums){
    $rtn = “”;
    $numslen = strlen($nums);
    //密文第一位标记数字的长度
    $begin = substr($this->codelen,$numslen – 1,1);

//密文的扩展位 $extlen = $this->length – $numslen – 1; $temp =
str_replace(‘.’, ”, $nums / $this->key); $temp = substr;

    //密文的扩展位
    $extlen = $this->length – $numslen – 1;
    $temp = str_replace(‘.’, ”, $nums / $this->key);
    $temp = substr($temp,-$extlen);

$arrextTemp = str_split; $arrext = str_split; foreach { $rtn .=
$arrextTemp[$v]; }

    $arrextTemp = str_split($this->codeext);
    $arrext = str_split($temp);
    foreach ($arrext as $v) {
      $rtn .= $arrextTemp[$v];
    }

$arrnumsTemp = str_split; $arrnums = str_split; foreach { $rtn .=
$arrnumsTemp[$v]; } return $begin.$rtn; }