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;

}