/**
* Windows with PHP < 5.3.0 will not have the function
* openssl_random_pseudo_bytes() available, so let's use
* CAPICOM to work around this deficiency.
*
* @param int $bytes
*
* @throws Exception
*
* @return string
*/
function random_bytes($bytes)
{
if (!is_int($bytes)) {
throw new TypeError('Length must be an integer');
}
if ($bytes < 1) {
throw new Error('Length must be greater than 0');
}
$buf = '';
$util = new COM('CAPICOM.Utilities.1');
$execCount = 0;
/**
* Let's not let it loop forever. If we run N times and fail to
* get N bytes of random data, then CAPICOM has failed us.
*/
do {
$buf .= base64_decode($util->GetRandom($bytes, 0));
if (RandomCompat_strlen($buf) >= $bytes) {
/**
* Return our random entropy buffer here:
*/
return RandomCompat_substr($buf, 0, $bytes);
}
++$execCount;
} while ($execCount < $bytes);
/**
* If we reach here, PHP has failed us.
*/
throw new Exception('PHP failed to generate random data.');
}
/**
* Windows with PHP < 5.3.0 will not have the function
* openssl_random_pseudo_bytes() available, so let's use
* CAPICOM to work around this deficiency.
*
* @param int $bytes
* @return string
*/
function random_bytes($bytes)
{
try {
$buf = '';
$util = new COM('CAPICOM.Utilities.1');
$execs = 0;
/**
* Let's not let it loop forever. If we run N times and fail to
* get N bytes of random data, then CAPICOM has failed us.
*/
do {
$buf .= base64_decode($util->GetRandom($bytes, 0));
if (RandomCompat_strlen($buf) >= $bytes) {
return RandomCompat_substr($buf, 0, $bytes);
}
++$execs;
} while ($execs < $bytes);
} catch (Exception $e) {
unset($e);
// Let's not let CAPICOM errors kill our app
}
throw new Exception('PHP failed to generate random data.');
}
