/** * 加密or解密,来自互联网,类似discuz传递信息 * <code> * echo $str=edcode('1371817454','ENCODE','1'); * echo edcode('XbfSC2GOpSTtwHwOIDW7Fg','DECODE','2000558'); * </code> * @param string $string 密文 * @param string $operation 操作类型 DECODE | DECODE * @param string $key 加密密钥 * @return string */ public static function edcode($string, $operation, $key = 'ePHP') { //ENCODE $key_length = strlen($key); $string = $operation == 'DECODE' ? Func::safe_b64decode($string) : substr(md5($string . $key), 0, 8) . $string; $string_length = strlen($string); $rndkey = $box = array(); $result = ''; for ($i = 0; $i <= 255; $i++) { $rndkey[$i] = ord($key[$i % $key_length]); $box[$i] = $i; } for ($j = $i = 0; $i < 256; $i++) { $j = ($j + $box[$i] + $rndkey[$i]) % 256; $tmp = $box[$i]; $box[$i] = $box[$j]; $box[$j] = $tmp; } for ($a = $j = $i = 0; $i < $string_length; $i++) { $a = ($a + 1) % 256; $j = ($j + $box[$a]) % 256; $tmp = $box[$a]; $box[$a] = $box[$j]; $box[$j] = $tmp; $result .= chr(ord($string[$i]) ^ $box[($box[$a] + $box[$j]) % 256]); } //DECODE if ($operation == 'DECODE') { if (substr($result, 0, 8) == substr(md5(substr($result, 8) . $key), 0, 8)) { return substr($result, 8); } else { return ''; } } else { return str_replace('=', '', Func::safe_b64encode($result)); } }