Removing whitespaces from encrypted data

Question

I have a function for decrypt earlier decrypted data:

public function Decrypt($encrypedText) {
    $key = "The secret key is";
    $decryptedText = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, base64_decode($encrypedText), MCRYPT_MODE_ECB);

    $trimmedData = rtrim($decryptedText, '\0');

    echo strlen($trimmedData);          // 32

    return $trimmedData;
}

If I put in "Test" in the function, the outcome will be "Test" + 28 white spaces. I got the tips from someone who told me to use "rtrim" as done in the function above to remove the white spaces, but that doesn't seem to work (when I check the length of the outcome it's still 32).

What can I do to remove these white spaces?

Have you tried the trim() without the second argument? Doing so will strip all whitespace characters and not just the NUL-byte character that you had specified. `$trimmedData = rtrim($decryptedText);`http://php.net/manual/en/function.rtrim.php — Buggabill, Sep 25 '12 at 20:06
@Buggabill: Convert your comment to an answer (or write a new one) and I'll accept it, cuz it solved my problem. :) — holyredbeard, Sep 25 '12 at 20:18

score 1 · Accepted Answer · answered Sep 25 '12 at 20:19

1

Try calling rtrim() without the second argument. This will strip a host of whitespace characters and not just the NUL-byte character that you had specified..

$trimmedData = rtrim($decryptedText);

answered Sep 25 '12 at 20:19

Buggabill

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score 0 · Answer 2 · answered Sep 25 '12 at 20:00

0

Strange, trim() should work. Try regular expression:

$string = preg_replace('~\s+$~', '', $string);

answered Sep 25 '12 at 20:00

Glavić

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Tried it, and it still contains of 32 chars :/ – holyredbeard Sep 25 '12 at 20:04
That proves that those characters are not whitespaces. Save output string to a file, and view it with hex editor... – Glavić Sep 25 '12 at 20:04
Point taken! Is there another way to view string without saving it to a file? – holyredbeard Sep 25 '12 at 20:08
try this function strToHex($string) { $hex=''; for ($i=0; $i < strlen($string); $i++) {$hex .= '%' . dechex(ord($string[$i])); } return $hex; } // and show me what the output is – Glavić Sep 25 '12 at 20:17

Removing whitespaces from encrypted data

2 Answers2