URL参数加密

php
function valEncrypt($value, $key) {
    $encrypt_key = md5(rand(0, 32000));
    $ctr = 0;
    $tmp = '';
    for($i = 0;$i < strlen($value); $i++) {
        $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
        $tmp .= $encrypt_key[$ctr].($value[$i] ^ $encrypt_key[$ctr++]);
    }
    return base64_encode(Encrypt($tmp, $key));
}
function valDecrypt($txt, $key) {
    $txt = Encrypt(base64_decode($txt), $key);
    $tmp = '';
    for($i = 0;$i < strlen($txt); $i++) {
        $md5 = $txt[$i];
        $tmp .= $txt[++$i] ^ $md5;
    }
    return $tmp;
}

function Encrypt($txt, $encrypt_key) {
    $encrypt_key = md5($encrypt_key);
    $ctr = 0;
    $tmp = '';
    for($i = 0; $i < strlen($txt); $i++) {
        $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
        $tmp .= $txt[$i] ^ $encrypt_key[$ctr++];
    }
    return $tmp;
}

$a = '中文123456';
$key = '8a5da52ed126447d359e70c05721a8aa';
echo $text =valEncrypt($a, $key);
echo '
';
echo valDecrypt($text, $key);