<?php
$string='abcdefghijklmnopqrstuvwsyzABCDEFGHIJKLMNOPQRSTUVWSYZ123456789012';
$code=StrCode($string,'ENCODE');
$key =substr(pw_decode($code,$string),0,18);//获取最后用于加密的钥匙
var_dump(pw_decode(StrCode("timestamp\t",'ENCODE'),$key));//得到密钥后,尝试破解其它的加密内容.

/**
* 破解方法
* @param string $code 加密过后的内容
* @param string $string 原始内容
* @return 返回解密内容
**/
function pw_decode($code,$string){
  $txt = base64_decode($code);
    $len    = strlen($string);
    $key    = '';
  $txt_len=strlen($txt);
    for($i=0; $i<$txt_len; $i++){
        $k        = $i % $len;
        $key .= chr(ord($txt[$i]) ^ ord($string[$k]));
    }
    return substr($key,0,18);
}
/**
* 加密、解密字符串
*
* @global string $db_hash
* @global array $pwServer
* @param $string 待处理字符串
* @param $action 操作，ENCODE|DECODE
* @return string
*/
function StrCode($string, $action = 'ENCODE') {
  $action != 'ENCODE' && $string = base64_decode($string);
  $code = '';
  $key = substr(md5('123456'), 8, 18);
  debug(TaString::ordstring($key,'|'));

  $keyLen = strlen($key);
  $strLen = strlen($string);
  for ($i = 0; $i < $strLen; $i++) {
    $k = $i % $keyLen;
    $code .= $string[$i] ^ $key[$k];
  }
  return ($action != 'DECODE' ? base64_encode($code) : $code);
}
?>

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