PHP implements enhanced encryption and decryption class examples, enhanced encryption and decryption_PHP tutorial

PHP implements enhanced encryption and decryption class examples, enhanced encryption and decryption

This article describes the example of PHP implementing enhanced encryption and decryption class. Share it with everyone for your reference. The details are as follows:

<&#63;php
class Ender{
  private $enkey;//加密解密用的密钥
  private $rep_char='#';
  //替换加密后的base64字符串中的=,因为=在有些场合是禁止使用的，
  //这里可以用一个允许的字符作为替换。
  //构造参数是密钥
  public function __construct($key=''){
    if(!$key){
      $this->enkey=$key;
    }
  }
  //设置密钥http://blog.ddian.cn
  public function set_key($key){
    $this->enkey=$key;
  }
  private function keyED($txt,$encrypt_key) 
  { 
  $encrypt_key = md5($encrypt_key); 
  $ctr=0; 
  $tmp = ""; 
  for ($i=0;$i<strlen($txt);$i++) 
  { 
  if ($ctr==strlen($encrypt_key)) $ctr=0; 
  $tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1); 
  $ctr++; 
  } 
  return $tmp;
  }
  //加密字符串
  public function encrypt($txt,$key='') 
  {
  if(!$key){
    $key=$this->enkey;
  }
  srand((double)microtime()*1000000); 
  $encrypt_key = md5(rand(0,32000)); 
  $ctr=0; 
  $tmp = ""; 
  for ($i=0;$i<strlen($txt);$i++) 
  { 
  if ($ctr==strlen($encrypt_key)) $ctr=0; 
  $tmp.= substr($encrypt_key,$ctr,1) . 
  (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1)); 
  $ctr++; 
  }
  $r=base64_encode($this->keyED($tmp,$key));
  $r=str_replace('=',$this->rep_char,$r);
  return $r; 
  }
  //解密字符串
  public function decrypt($txt,$key='') 
  {
  $txt=str_replace($this->rep_char,'=',$txt);
  $txt=base64_decode($txt);
  if(!$key){
      $key=$this->enkey;
  }
  $txt = $this->keyED($txt,$key); 
  $tmp = ""; 
  for ($i=0;$i<strlen($txt);$i++) 
  { 
  $md5 = substr($txt,$i,1); 
  $i++; 
  $tmp.= (substr($txt,$i,1) ^ $md5); 
  } 
  return $tmp; 
  }
}

I hope this article will be helpful to everyone’s PHP programming design.

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