正常来说aes-128-cbc密钥长度是16位，结果他们提供的是32位，仔细观察发现是16进制，需要转化成二进制后就是16位了，然后就可以使用。

       $mingwen = '{"staffNo":"00123456","staffName":"测试人员","timestamp":"1690941587475"}';
        $key = hex2bin("7f6bcf26b98d0a447daedef492f705af");
        $iv = hex2bin("a1e742db68612d64e4e14fa0c988a0bd");
        var_dump($key);
        var_dump($iv);
        $method = "AES-128-CBC";
        echo  $miwen = strToHex(openssl_encrypt($mingwen, $method, $key, OPENSSL_PKCS1_PADDING, $iv));
        echo  $mingwen = openssl_decrypt(hexToStr($miwen), $method, $key, OPENSSL_PKCS1_PADDING, $iv);
        die;






//函数将输入的十六进制字符串转换为普通字符串
function hexToStr($hex)
{
    $string = "";
    for ($i = 0; $i < strlen($hex) - 1; $i += 2)
        $string .= chr(hexdec($hex[$i] . $hex[$i + 1]));
    return  $string;
}

// 函数将输入的普通字符串转换为十六进制字符串
function strToHex($string)
{
    $hex = "";
    $tmp = "";
    for ($i = 0; $i < strlen($string); $i++) {
        $tmp = dechex(ord($string[$i]));
        $hex .= strlen($tmp) == 1 ? "0" . $tmp : $tmp;
    }
    $hex = strtoupper($hex);
    return $hex;
}