gmp_xor

(PHP 4 >= 4.0.4, PHP 5)

gmp_xor — Bitwise XOR

Описание

resource gmp_xor ( resource $a , resource $b )

Calculates bitwise exclusive OR (XOR) of two GMP numbers.

Список параметров

a: It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.
b: It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

Возвращаемые значения

A GMP number resource.

Примеры

Пример #1 gmp_xor() example


<?php
$xor1 = gmp_init("1101101110011101", 2);
$xor2 = gmp_init("0110011001011001", 2);

$xor3 = gmp_xor($xor1, $xor2);

echo gmp_strval($xor3, 2) . "\n";
?>

Результат выполнения данного примера:

1011110111000100

Коментарии

Jul 15

Автор: mikko at entris dot net


The logical XOR can be used for encrypting data. Use resource A as your original text and resource B as the key. Be sure to use long enough key so that the key doesn't loop. Decryption works the same way, input encrypted text as res A and key as res B.

2002-07-15 05:33:13

http://php5.kiev.ua/manual/ru/function.gmp-xor.html

Jan 07

Автор: patm at pureconnection dot net


XOR encryption only works if the key is at liest the same size as the plaintext, and the key is perfectly random. And no, rand() is not perfectly random.

2004-01-07 19:22:44

http://php5.kiev.ua/manual/ru/function.gmp-xor.html

Mar 28

Автор: bukaj at bukaj dot net


XOR encryption is an ultimate encryption algorithm. It can't be be broken. It is used to encrypt stealth submarine's orders. I cannot agree with "kid-sister" post below. If you use vast key (as long as encrypted message) which is random (space noise recorded on a cd), the encrypted message is also radnom - impossible to decrypt without key. Under those conditions, XOR is strongest encryption algorithm ever known.

2005-03-28 20:38:48

http://php5.kiev.ua/manual/ru/function.gmp-xor.html

Oct 03

Автор: kimcbrowne at hotmail dot com


To be unbreakable XOR encryption must have a key that is totally random and is never re-used.  If you use a key a second time, it can be broken.  This can be confirmed by reading the page at http://en.wikipedia.org/wiki/One-time_pad.



Although I am not an expert on cryptography, I understand that decyphering involves recognizing patterns and that it would be possible to decrypt code that was encoded using XOR with the same key if there were enough samples to examine.  Maintaining unique keys for each encryption at both encryption and decryption points to ensure 100 percent unbreakability has security problems of its own - where and how are the keys stored and how are they transmitted to the decryption points?

2005-10-03 22:48:23

http://php5.kiev.ua/manual/ru/function.gmp-xor.html

Jul 02

Автор: greenone


here's a fast alternative to compute the xor-value of two bitstrings of an arbitrary (but same) length.



<?php

/**

 * xor-op for bitstrings of arbitrary length

 * bitstrings must have same length

 * 

 * @param string $o1

 * @param string $o2

 * @return string

 */

function bitxor($o1, $o2) {

    $xorWidth = PHP_INT_SIZE*8;

    $o1 = str_split($o1, $xorWidth);

    $o2 = str_split($o2, $xorWidth);

    $res = '';

    $runs = count($o1);

    for($i=0;$i<$runs;$i++)

        $res .= decbin(bindec($o1[$i]) ^ bindec($o2[$i]));        

    return $res;

}

?>