/**
* Generate a random number
*
* @param optional Integer $min
* @param optional Integer $max
* @return BigInteger
* @access public
*/
function random($min = false, $max = false)
{
if ($min === false) {
$min = new BigInteger(0);
}
if ($max === false) {
$max = new BigInteger(0x7fffffff);
}
$compare = $max->compare($min);
if (!$compare) {
return $this->_normalize($min);
} else {
if ($compare < 0) {
// if $min is bigger then $max, swap $min and $max
$temp = $max;
$max = $min;
$min = $temp;
}
}
$generator = $this->generator;
$max = $max->subtract($min);
$max = ltrim($max->toBytes(), chr(0));
$size = strlen($max) - 1;
$random = '';
$bytes = $size & 1;
for ($i = 0; $i < $bytes; ++$i) {
$random .= chr($generator(0, 255));
}
$blocks = $size >> 1;
for ($i = 0; $i < $blocks; ++$i) {
// mt_rand(-2147483648, 0x7FFFFFFF) always produces -2147483648 on some systems
$random .= pack('n', $generator(0, 0xffff));
}
$temp = new BigInteger($random, 256);
if ($temp->compare(new BigInteger(substr($max, 1), 256)) > 0) {
$random = chr($generator(0, ord($max[0]) - 1)) . $random;
} else {
$random = chr($generator(0, ord($max[0]))) . $random;
}
$random = new BigInteger($random, 256);
return $this->_normalize($random->add($min));
}
/**
* Generate a random number
*
* @param optional Integer $min
* @param optional Integer $max
* @return Math_BigInteger
* @access public
*/
function random($min = false, $max = false)
{
if ($min === false) {
$min = new BigInteger(0);
}
if ($max === false) {
$max = new BigInteger(0x7fffffff);
}
$compare = $max->compare($min);
if (!$compare) {
return $this->_normalize($min);
} else {
if ($compare < 0) {
// if $min is bigger then $max, swap $min and $max
$temp = $max;
$max = $min;
$min = $temp;
}
}
$max = $max->subtract($min);
$max = ltrim($max->toBytes(), chr(0));
$size = strlen($max) - 1;
$crypt_random = function_exists('crypt_random_string') || !class_exists('Crypt_Random') && function_exists('crypt_random_string');
if ($crypt_random) {
$random = crypt_random_string($size);
} else {
$random = '';
if ($size & 1) {
$random .= chr(mt_rand(0, 255));
}
$blocks = $size >> 1;
for ($i = 0; $i < $blocks; ++$i) {
// mt_rand(-2147483648, 0x7FFFFFFF) always produces -2147483648 on some systems
$random .= pack('n', mt_rand(0, 0xffff));
}
}
$fragment = new BigInteger($random, 256);
$leading = $fragment->compare(new BigInteger(substr($max, 1), 256)) > 0 ? ord($max[0]) - 1 : ord($max[0]);
if (!$crypt_random) {
$msb = chr(mt_rand(0, $leading));
} else {
$cutoff = floor(0xff / $leading) * $leading;
while (true) {
$msb = ord(crypt_random_string(1));
if ($msb <= $cutoff) {
$msb %= $leading;
break;
}
}
$msb = chr($msb);
}
$random = new BigInteger($msb . $random, 256);
return $this->_normalize($random->add($min));
}
