gmp_xor

    (PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

    gmp_xor — Bitwise XOR

    Description

    gmp_xor(GMP|int|string $num1, GMP|int|string $num2): GMP

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

    Parameters

    num1

    A GMP object, an int, or a string that can be interpreted as a number following the same logic as if the string was used in gmp_init() with automatic base detection (i.e. when base is equal to 0).

    num2

    A GMP object, an int, or a string that can be interpreted as a number following the same logic as if the string was used in gmp_init() with automatic base detection (i.e. when base is equal to 0).

    Return Values

    A GMP object.

    Examples

    Example #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";
    ?>

    The above example will output:

    1011110111000100

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    User Contributed Notes 5 notes

    up
    5
    kimcbrowne at hotmail dot com
    19 years ago
    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?
    up
    3
    bukaj at bukaj dot net
    19 years ago
    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.
    up
    1
    patm at pureconnection dot net
    20 years ago
    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.
    up
    0
    mikko at entris dot net
    22 years ago
    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.
    up
    -3
    greenone
    16 years ago
    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;
    }
    ?>
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