如何实现一个PHP加密解密类进行数据安全分享？

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phpclass Option { private static $original=array('=', '+', '/'); private static $later=array('O0O0O', 'o0O0o', 'oo00o');

function __construct() {}

private static function md5($skey='') { $skey=$skey ? $skey : 'ui'; // uicms::config('se') }}

class ption { private static $original = array('=', '+', '/'); private static $later = array('O0O0O', 'o0O0o', 'oo00o'); function __construct() { } private static function md5($skey = '') { $skey = $skey ? $skey : 'ui' ; //uicms::_config('security/authkey'); return md5(substr($skey, 0, 16)); } /** * @use ption::en($string, $key); * @param String $string 需要加密的字串 * @param String $skey 密钥 * @param int $expiry 密文有效期, 加密时候有效， 单位 秒，0 为永久有效 * @return String */ static public function en($string = '', $skey = '', $expiry=0) { if( is_array( $string ) ) { $string = json_encode($string); // uicms::json($string, true, 'en'); } $string = str_pad($expiry ? $expiry + TIME : 0, 10, 0).$string; $strArr = str_split(base64_encode($string)); $strCount = count($strArr); $skey = static::md5($skey); foreach (str_split($skey) as $key => $value) { $key < $strCount && $strArr[$key].=$value; } return str_replace(self::$original, self::$later, join('', $strArr)); } /** * @use ption::de($string, $key); * @param String $string 需要解密的字串 * @param String $skey 密钥 * @return String */ static public function de($string = '', $skey = '') { $strArr = str_split(str_replace(self::$later, self::$original, $string), 2); $strCount = count($strArr); $skey = static::md5($skey); foreach (str_split($skey) as $key => $value) { $key <= $strCount && $strArr[$key][1] === $value && $strArr[$key] = $strArr[$key][0]; } $result = base64_decode(join('', $strArr)); if(substr($result, 0, 10) == 0 || substr($result, 0, 10) - TIME > 0) { return substr($result, 10); } else { return false; } } }