key; } srand((double)microtime()*1000000); $encrypt_key = md5(rand(0,32000)); $ctr=0; $tmp = ""; for ($i=0;$iSetToHexString($this->keyED($tmp,$key)); } public function decrypt($txt,$key="") { if(empty($key)){ $key=$this->key; } $txt = $this->UnsetFromHexString($txt); $txt = $this->keyED($txt,$key); $tmp = ""; for ($i=0;$ikey=$key; } public function getKey() { return $this->key; } //////////////////////////此处一下转16进制 public function SingleDecToHex($dec) { $tmp=""; $dec=$dec%16; if($dec<10) return $tmp.$dec; $arr=array("a","b","c","d","e","f"); return $tmp.$arr[$dec-10]; } public function SingleHexToDec($hex) { $v=ord($hex); if(47<$v&&$v<58) return $v-48; if(96<$v&&$v<103) return $v-87; } public function SetToHexString($str) { if(!$str)return false; $tmp=""; for($i=0;$iSingleDecToHex(($ord-$ord%16)/16); $tmp.=$this->SingleDecToHex($ord%16); } return $tmp; } public function UnsetFromHexString($str) { if(!$str)return false; $tmp=""; for($i=0;$iSingleHexToDec(substr($str,$i,1))*16+$this->SingleHexToDec(substr($str,$i+1,1))); } return $tmp; } /* echo SetToHexString("hello,大家好123"); echo "

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"; echo UnsetFromHexString(SetToHexString("hello,大家好123")); */ } /* $crypt= new crypt(); $enc_text = $crypt->encrypt('123456','wwwthinksaascn2012'); $dec_text = $crypt->decrypt($enc_text,'wwwthinksaascn2012'); */