diff --git a/prime.php b/prime.php
index fb4233fe..de823bb6 100644
--- a/prime.php
+++ b/prime.php
@@ -72,7 +72,55 @@ class PrimeModule
 
         return true;
     }
+    // taken from https://github.com/enricostara/telegram-mt-node/blob/master/lib/security/pq-finder.js
+    public function factorization($num) {
+        $zero = new \phpseclib\Math\BigInteger(0);
+        $one = new \phpseclib\Math\BigInteger(1);
+        $two = new \phpseclib\Math\BigInteger(2);
+        $three = new \phpseclib\Math\BigInteger(3);
 
+        $prime = new \phpseclib\Math\BigInteger();
+
+        for ($i = 0; $i < 3; $i++) {
+            $q = new \phpseclib\Math\BigInteger((random_int(0, 128) & 15) + 17);
+            $x = new \phpseclib\Math\BigInteger(random_int(0, 1000000000) + 1);
+            $y = $x;
+            $lim = 1 << ($i + 18);
+            for ($j = 1; $j < $lim; $j++) {
+                $a = $x;
+                $b = $x;
+                $c = $q;
+                while (!$b->equals($zero)) {
+                    if (b.repr[0] & 1) {
+                        c.addEquals(a);
+                        if (c.gt(num)) {
+                            c = c.subtract(num);
+                        }
+                    }
+                    a.addEquals(a);
+                    if (a.gt(num)) {
+                        a = a.subtract(num);
+                    }
+                    b = b.shiftRight(1);
+                }
+                $x = $c;
+                $z = $y.gt(x) ? y.subtract(x) : x.subtract(y);
+                $prime = z.gcd(num, a, b);
+                if (!prime.eql(BigInteger.One())) {
+                    break;
+                }
+                if ((j & (j - 1)) === 0) {
+                    $y = $x;
+                }
+            }
+            if (prime.gt(BigInteger.One())) {
+                break;
+            }
+        }
+        $cofactor = num.divide(prime)[0];
+        $_pq = cofactor.gt(prime) ? [prime, cofactor] : [cofactor, prime];
+        return _$pq;
+    }
     public function pollard_brent($n)
     {
         $zero = new \phpseclib\Math\BigInteger(0);
@@ -214,78 +262,4 @@ class PrimeModule
         return floor(abs(($a * $b)) / $this->gcd($a, $b));
     }
 
-/*
-function pqPrimeLeemon ($what) {
-  $minBits = 64;
-  $minLen = ceil($minBits / $bpe) + 1;
-  $it = 0
-  $a = new Array(minLen)
-  $b = new Array(minLen)
-  $c = new Array(minLen)
-  $g = new Array(minLen)
-  $z = new Array(minLen)
-  $x = new Array(minLen)
-  $y = new Array(minLen)
-
-  for ($i = 0; $i < 3; $i++) {
-    $q = (nextRandomInt(128) & 15) + 17
-    copyInt_(x, nextRandomInt(1000000000) + 1)
-    copy_(y, x)
-    lim = 1 << (i + 18)
-
-    for (j = 1; j < lim; j++) {
-      ++it
-      copy_(a, x)
-      copy_(b, x)
-      copyInt_(c, q)
-
-      while (!isZero(b)) {
-        if (b[0] & 1) {
-          add_(c, a)
-          if (greater(c, what)) {
-            sub_(c, what)
-          }
-        }
-        add_(a, a)
-        if (greater(a, what)) {
-          sub_(a, what)
-        }
-        rightShift_(b, 1)
-      }
-
-      copy_(x, c)
-      if (greater(x, y)) {
-        copy_(z, x)
-        sub_(z, y)
-      } else {
-        copy_(z, y)
-        sub_(z, x)
-      }
-      eGCD_(z, what, g, a, b)
-      if (!equalsInt(g, 1)) {
-        break
-      }
-      if ((j & (j - 1)) == 0) {
-        copy_(y, x)
-      }
-    }
-    if (greater(g, one)) {
-      break
-    }
-  }
-
-  divide_(what, g, x, y)
-
-  if (greater(g, x)) {
-    P = x
-    Q = g
-  } else {
-    P = g
-    Q = x
-  }
-
-  // console.log(dT(), 'done', bigInt2str(what, 10), bigInt2str(P, 10), bigInt2str(Q, 10))
-
-  return [bytesFromLeemonBigInt(P), bytesFromLeemonBigInt(Q), it]
-}*/
 }