php openssl_encrypt加密解密

public function encryptDecrypt($string, $decrypt = 'encode', $key = 'this is key'){$l = strlen($key);if ($l < 16) {$key = str_repeat($key, ceil(16 / $l));}if ($decrypt == 'encode') {if ($m = strlen($string) % 8) {$string .= str_repeat("\x00", 8 - $m);}$sign = base64_encode(openssl_encrypt($string, 'BF-ECB', $key, OPENSSL_RAW_DATA | OPENSSL_NO_PADDING));} else {$sign = openssl_decrypt(base64_decode($string), 'BF-ECB', $key, OPENSSL_RAW_DATA | OPENSSL_NO_PADDING);$sign = rtrim($sign, "\x00");}return $sign;}

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