CVE-2023-27560: PrimeField: prevent infinite loop with composite primefields · phpseclib/phpseclib@6298d1c

@@ -263,13 +263,13 @@ public function squareRoot()

$r = $this->value->powMod($temp, static::$modulo[$this->instanceID]);

while (!$t->equals($one)) {

$i = clone $one;

while (!$t->powMod($two->pow($i), static::$modulo[$this->instanceID])->equals($one)) {

$i = $i->add($one);

for ($i == clone $one; $i->compare($m) < 0; $i = $i->add($one)) {

if ($t->powMod($two->pow($i), static::$modulo[$this->instanceID])->equals($one)) {

break;

}

}

if ($i->compare($m) >= 0) {

if ($i->compare($m) == 0) {

return false;

}

$b = $c->powMod($two->pow($m->subtract($i)->subtract($one)), static::$modulo[$this->instanceID]);