protected static function _powmod($x, $y, $m)
{
$n = count($y);
$p = array(1);
for ($i = 0; $i < $n - 1; $i++) {
$tmp = $y[$i];
for ($j = 0; $j < 0xf; $j++) {
if ($tmp & 1) {
$p = BigInt::div(BigInt::mul($p, $x), $m, 1);
}
$tmp >>= 1;
$x = BigInt::div(BigInt::mul($x, $x), $m, 1);
}
}
$tmp = $y[$i];
while ($tmp) {
if ($tmp & 1) {
$p = BigInt::div(BigInt::mul($p, $x), $m, 1);
}
$tmp >>= 1;
$x = BigInt::div(BigInt::mul($x, $x), $m, 1);
}
return $p;
}
/**
Return a new BigInt object containing the result
of a logical AND operation on this BigInt and $bigint.
*/
public function LogicalAND(BigInt $bigint)
{
if ($bigint == null) {
throw new Exception("Argument error :: bigint cannot be null!");
}
$count = $this->width;
if ($count != $bigint->Width()) {
throw new Exception("Format error :: BigInts must be of equal size!");
}
$bigint_arr = $bigint->ToBitArray();
$ret = $this->InitializeArray($count);
for ($i = 0; $i < $count; $i++) {
if ($this->bits[$i] == 1 && $bigint_arr[$i] == 1) {
$ret[$i] = 1;
}
}
return $this->ToBigInt($ret);
}
public function divisionLarge()
{
$a = new BigInt('1846332104484924953979619544386780054125593365543499568033685888050');
$b = new BigInt('36486872398567981638843143228254546051651870');
$r = new BigInt('50602640980469152653015');
$this->assertEquals($r, $a->divide($b));
}
function _key_exchange()
{
if (!is_null($this->_key) || $this->_encryptMode == 0) {
return true;
}
$request = "phprpc_encrypt=true&phprpc_keylen={$this->_keylen}";
$result = $this->_post($request);
if (is_a($result, 'PHPRPC_Error')) {
return $result;
}
if (array_key_exists('phprpc_keylen', $result)) {
$this->_keylen = (int) $result['phprpc_keylen'];
} else {
$this->_keylen = 128;
}
if (array_key_exists('phprpc_encrypt', $result)) {
$encrypt = unserialize(base64_decode($result['phprpc_encrypt']));
PHPRPC::xxtea();
// require_once('xxtea.php');
$x = BigInt::random($this->_keylen - 1, true);
$key = BigInt::powmod(BigInt::dec2num($encrypt['y']), $x, BigInt::dec2num($encrypt['p']));
if ($this->_keylen == 128) {
$key = BigInt::num2str($key);
} else {
$key = pack('H*', md5(BigInt::num2dec($key)));
}
$this->_key = str_pad($key, 16, "", STR_PAD_LEFT);
$encrypt = BigInt::num2dec(BigInt::powmod(BigInt::dec2num($encrypt['g']), $x, BigInt::dec2num($encrypt['p'])));
$request = "phprpc_encrypt={$encrypt}";
$result = $this->_post($request);
if (is_a($result, 'PHPRPC_Error')) {
return $result;
}
} else {
$this->_key = NULL;
$this->_encryptMode = 0;
}
return true;
}
/**
* CRC32
*
* @param math.BigInt key
* @param int char
* @return math.BigInt updated checksum
*/
protected function crc32($key, $char)
{
$l = new BigInt(self::$crc32[$key->bitwiseXor($char)->byteValue()]);
return new BigInt($l->bitwiseXor($key->shiftRight(8)));
}
