XOREncryption/PHP/XOREncryption.php

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PHP
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<?php
function encryptDecrypt($input) {
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$key = 'KCQ';
$inputLen = strlen($input);
$keyLen = strlen($key);
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if ($inputLen <= $keyLen) {
return $input ^ $key;
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}
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for ($i = 0; $i < $inputLen; ++$i) {
$input[$i] = $input[$i] ^ $key[$i % $keyLen];
}
return $input;
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}
$encrypted = encryptDecrypt('kylewbanks.com');
echo "Encrypted:" . $encrypted . "\n";
$decrypted = encryptDecrypt($encrypted);
echo "Decrypted:" . $decrypted . "\n";