php 加密解密种(含公钥)

php 加密解密类(含公钥)

?

<span><span><?php class  Crypt{ protected $key = "";    //公钥 private function keyED($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 $tmp; } public function encrypt($txt,$key="") { if(empty($key)){ $key=$this->key; } 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++; } return $this->keyED($tmp,$key); } public function decrypt($txt,$key="") { if(empty($key)){ $key=$this->key; } $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 $tmp; } public function setKey($key) { if(empty($key)){ return null; } $this->key=$key; } public function getKey() { return $this->key; } } $string = "http://www.52blogger.com"; $crypt= new Crypt(); $crypt->setKey("http://www.52blogger.com"); $enc_text = $crypt->encrypt($string,$crypt->getKey()); $dec_text = $crypt->decrypt($enc_text,$crypt->getKey()); echo "加密前 : $string <br/>\n"; echo </span>"加密后 : $enc_text <br/>\n</span>"; <span><span>echo </span>"解密后 : $dec_text \n</span>"; <span><span>?> </span></span>