error with characters when decoding a variable from js to php

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error with characters when decoding a variable from js to php

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#1 by (1 votes)

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Hello, I am a problem that I do not know the reason, I have a code encoded in base64 and I inserted this code into a js variable, from php to js, it worked more perfect impossible, then I passed this js variable to php, also worked beauty, it displays exactly the code after encoding, the problem was when decoding

Encode like this:

$encode = base64_encode(salt.hash));

I went to js like this:

window.localStorage.setItem("campo", "<?php echo $encode; ?>");

I switched to PHP like this:

$decode_js = "<script>document.write(localStorage.getItem('campo'))</script>";

Decode and display like this:

echo $decode = base64_decode($decode_js);

In this echo, what it brings is something very monstrous:

That:

MGszbGk5MGlvb2Y0ZWhwdXNkc2JhYWNmOTNlZTUyZTBlNjI0ZmQ0NzNkZjUyYjVlZDE5N2Y0ODM5NTQ0OWZmN2YxZjY0ZDg2ZDgzZWQ0YjBlNmRlNTFiYTk2ZmQ2YjA1ZjU1MjI5MTFmM2Q2OWI5N2RiMGUwMzhlYTg0OWZmYzBjZThiYWQxMDMxZjUzMmRkYWI0NzFiOTAzZA

Turned this:

hr 鞞 + ץ ƥJ + j z -zh >)

Can anyone help me with anything? Thank you in advance

php javascript base64 encode

asked by anonymous 12.07.2015 / 15:24

1 answer

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score 1 · Accepted Answer

The problem is that you are decoding the function of javascript and not the output of document.write, because php sends the information to the server first, then run the javascript. I kept the output in javascript:


<script type="text/javascript">
<?php 
$salt_rash = 'seucodigo';
$encode = base64_encode($salt_rash);
?>

function setCodigo() {
   localStorage.getItem('campo', '<?php echo $encode?>');
}

function getCodigo() {
 var codigo = base64_decode_js(localStorage.getItem('campo'));
 document.write(codigo);
}

function base64_decode_js(data) {
 var b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
  var o1, o2, o3, h1, h2, h3, h4, bits, i = 0,
    ac = 0,
    dec = '',
    tmp_arr = [];

  if (!data) {
    return data;
  }

  data += '';

  do { // unpack four hexets into three octets using index points in b64
    h1 = b64.indexOf(data.charAt(i++));
    h2 = b64.indexOf(data.charAt(i++));
    h3 = b64.indexOf(data.charAt(i++));
    h4 = b64.indexOf(data.charAt(i++));

    bits = h1 << 18 | h2 << 12 | h3 << 6 | h4;

    o1 = bits >> 16 & 0xff;
    o2 = bits >> 8 & 0xff;
    o3 = bits & 0xff;

    if (h3 == 64) {
      tmp_arr[ac++] = String.fromCharCode(o1);
    } else if (h4 == 64) {
      tmp_arr[ac++] = String.fromCharCode(o1, o2);
    } else {
      tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);
    }
  } while (i < data.length);

  dec = tmp_arr.join('');

  return dec.replace(/
<script type="text/javascript">
<?php 
$salt_rash = 'seucodigo';
$encode = base64_encode($salt_rash);
?>

function setCodigo() {
   localStorage.getItem('campo', '<?php echo $encode?>');
}

function getCodigo() {
 var codigo = base64_decode_js(localStorage.getItem('campo'));
 document.write(codigo);
}

function base64_decode_js(data) {
 var b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
  var o1, o2, o3, h1, h2, h3, h4, bits, i = 0,
    ac = 0,
    dec = '',
    tmp_arr = [];

  if (!data) {
    return data;
  }

  data += '';

  do { // unpack four hexets into three octets using index points in b64
    h1 = b64.indexOf(data.charAt(i++));
    h2 = b64.indexOf(data.charAt(i++));
    h3 = b64.indexOf(data.charAt(i++));
    h4 = b64.indexOf(data.charAt(i++));

    bits = h1 << 18 | h2 << 12 | h3 << 6 | h4;

    o1 = bits >> 16 & 0xff;
    o2 = bits >> 8 & 0xff;
    o3 = bits & 0xff;

    if (h3 == 64) {
      tmp_arr[ac++] = String.fromCharCode(o1);
    } else if (h4 == 64) {
      tmp_arr[ac++] = String.fromCharCode(o1, o2);
    } else {
      tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);
    }
  } while (i < data.length);

  dec = tmp_arr.join('');

  return dec.replace(/%pre%+$/, '');
}
</script>

<body onload="setCodigo();getCodigo();">
+$/, '');
}
</script>

<body onload="setCodigo();getCodigo();">