class Encrypt { /** * 字符串解密 * @param string $string 需要解密的字符串 * @param string $key祕鑰 * @return string */ public static function decode(string $string, string $key = '') { $code = ""; $key = md5($key); $key_length = strlen($key); $string = base64_decode($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])); } if (substr($result, 0, 8) == substr(md5(substr($result, 8) . $key), 0, 8)) { $code = substr($result, 8); } return $code; } /** * 字符串加密 * @param string $string 需要加密的字符串 * @param string $key祕鑰 * @return string */ public static function encode(string $string, string $key = '') { $key = md5($key); $key_length = strlen($key); $string = substr(md5($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])); } return str_replace('=', '', base64_encode($result)); } }
$str = Encrypt::encode("lizhaoyao", "123456"); var_dump($str); $str = Encrypt::decode($str, "123456"); var_dump($str);
我這樣調用了一下發現結果是這樣的