Question

How to use XOR Encryption (XOR Cipher) to encryption a string in PHP

Answer 1

function XOREncryption($s, $key) {
    $slen = strlen($s);
    $keylen = strlen($key);
         
    $result = $s;
     
    for ($i = 0; $i < $slen; $i++) {
        $result[$i] = ($s[$i] ^ $key[$i % $keylen]);
    }
     
    return $result;
}    
        
$s = "PHP is a general-purpose scripting language geared towards web development";
$key = "secretkey";
         
$cipher = XOREncryption($s, $key);
echo $cipher . "\n";
         
$noncipher = XOREncryption($cipher, $key);
echo $noncipher . "\n";

 
 
 
 
/*
run:
 
#-3RKY
H	KEET
EY
PHP is a general-purpose scripting language geared towards web development
 
*/

 

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